PENTAX
Japanese Top Quality Optics |
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No matter whether you buy a Pentax spotting scope, eyepiece or binocular - you can be sure that you get top quality and workmanship.
We believe that Pentax quality can hardly be surpassed. We gladly present to you the wonderful products made by Pentax.
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Easy Payment: We offer our customers several easy and fast payment methods. You will receive exact payment details when ordering or on request! |
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Astronomical eyepieces
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Spotting Scopes
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Eyepieces
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Pentax offers products of an outstanding quality. The eyepieces are no exception to that.
Despite the relatively high price you still get a lot for your money.
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Pentax XW - Wide Angle Eyepieces
Eyepieces with a very high light transmission and excellent observing comfort.
Properties of the Pentax XW Eyepieces: |
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| Apparent Field of View |
70° - the entire field of view can be seen easily and without straining your eyes. |
| Coating |
SMC Multi-Layer Coating on all glass-to-air surfaces |
| Glass substrate |
ED Glass (Lanthanum) |
| Number of lenses / groups |
6-8 Lenses in 4-6 groups |
| Light Transmission |
approx. 98% |
| Lens edges |
blackened for best possible contrast |
| Eye relief |
20mm - the entire field of view can easily be seen by eyeglass wearers |
| Eyeguard |
Infinitely adjustable - the eyeguard can be extended by screwing it. This makes it impossible to slip away at the press of your head as is possible with some other adjustable eyeguard designs. |
| Rubber armour |
comfortable and ergonomic grip even in cold weather. |
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The Pentax XW eyepieces are suited for practically all possible observations - be it extended deep sky objects with an excellent image sharpness over the entire field of view or planets for which sharpness on the optical centerline is most important - the Pentax XW eyepieces will excel in all these situations.
The comfortable eye relief and ergonomic design offer relaxed observing conditions for long periods without tiring the user. You can observe both extended objects and small, high power objects. The excellent contrast and light transmission (approx. 98%) make light contrasts and small details discernible.
The eyepieces are weatherproof according to JIS class 4. This signifies a particularly robust coating and eyepiece body. |
Specifications
| Item No. |
Focal length |
AFOV |
Eye relief |
Lenses / Groups |
Barrel size |
Length |
Diameter |
Weight |
| XW 3.5 |
3.5 mm |
70° |
20 mm |
8 Lenses / 5 Groups |
1.25" |
137 mm |
61 mm |
405 g |
| XW 5 |
5 mm |
70° |
20 mm |
8 Lenses / 5 Groups |
1.25" |
127 mm |
61 mm |
395 g |
| XW 7 |
7 mm |
70° |
20 mm |
8 Lenses / 6 Groups |
1.25" |
120 mm |
61 mm |
390 g |
| XW 10 |
10 mm |
70° |
20 mm |
8 Lenses / 6 Groups |
1.25" |
110 mm |
61 mm |
390 g |
| XW 14 |
14 mm |
70° |
20 mm |
8 Lenses / 6 Groups |
1.25" |
97 mm |
61 mm |
365 g |
| XW 20 |
20 mm |
70° |
20 mm |
6 Lenses / 4 Groups |
1.25" |
86 mm |
61 mm |
355 g |
| XW 30 |
30 mm |
70° |
20 mm |
7 Lenses / 6 Groups |
2" |
123 mm |
76 mm |
740 g |
| XW 40 |
40 mm |
70° |
20 mm |
6 Lenses / 5 Groups |
2" |
117 mm |
76 mm |
700 g |
Prices and availability: Please see our new Online Shop
Pentax XF Eyepieces 8.5mm & 12mm
Eyepieces for comfortable lunar and planetary observing - recommended for binocular use
Size comparison between the Pentax XW 14 (center) and the Pentax XF eyepieces.
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When creating their new XF eyepiece line Pentax put emphasis on several points:
Usability for Binocular Viewers
The popular XW eyepieces had one big advantage - due to their large physical size they were not suitable for use in binocular viewers. The new XF eyepieces have a much smaller size and therefore are excellently suited for binocular viewing.
Low Cost and Good Image Quality
The market nowadays is radically different from the one several years ago when the XW and the older XL eyepieces were developed. To meet the market's new demand for ultra-low prices Pentax developed the XF line that costs a lot less than the larger XW eyepieces, yet still retains a large part of their image quality.
In light transmission and sharpness the XF eyepieces are on a similarly high level as in the XW eyepieces and the field of view and eye relief are still much larger than for instance in a regular Plossl eyepiece. Special ED glasses are used for optimized image quality.
Click-Stop Type Extendable Eyeguards
Pentax had learned their lesson well concerning viewing comfort on binoculars. Extendable rubber eyeguards for protection against stray light have four different user-adjustable settings.
Long Eye Relief -18mm
For both focal lengths the eye relief is a comfortable 18 mm for an Apparent Field of View of 60° which makes the eyepieces suitable for eyeglass wearers.
The Two Focal Lengths are Parfocal
The eyepieces are parfocal. This means that you need not refocus after switching the eyepieces. Please note: This does not necessarily imply that the eyepieces are parfocal with other eyepiece lines of course! We only refer to XF 8.5mm and XF 12mm.
Low Weight
At only 155g (XF12) and 150g (XF8.5) the eyepieces are very light. This makes them an ideal choice for travelling. |
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Optical layout of the XF eyepieces
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| Pentax XF Eyepiece Specifications |
| Focal Length |
12 mm |
8.5 mm |
| Lenses / Groups |
6 Lenses in 4 groups |
6 Lenses in 4 groups |
| Apparent Field of View |
60° |
60° |
| Eye Relief |
18 mm |
18 mm |
| Dimensions |
78 x diameter 43 mm |
93 x diameter 43 mm |
| Weight |
155 g |
150 g |
| Thread |
M 30.5 x 0.5 |
M 30.5 x 0.5 |
| Accessories |
Dust caps, storage case |
Dust caps, storage case |
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Pentax Zoom - a good zoom eyepiece at a reasonable price
Zoom eyepieces have many advantages - the variable focal lenght and the resulting variable magnifications allow the user to always be able to choose the desired magnification freely.
But most zoom eyepieces suffer from small glitches in quality - the effect of a sub-standard coating, interior blackening or mechanical tolerances is particularly disconcerting.
Pentax has created the PE Zoom as a good eyepiece at a reasonable price.Pentax hat mit dem PE Zoom ein gutes Okular zu einem vernünftigen Preis geschaffen.
Specifications:
| Focal length |
6.5mm to 19.5mm |
| Apparent field of view |
60° (at 6.5mm) to 42° (at 19.5mm) |
| Eye relief |
11mm to 15mm |
| Coating |
Multi-Layer Coating on all glass-to-air surfaces |
| Barrel size |
1.25" |
| Number of lenses |
6 lenses in 4 groups |
| Dimensions |
90mm x 50mm x 50mm |
| Weight |
240 Grams |
Prices and availability: Please see our new Online Shop
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Please send requests or online orders to: sales@telescope-service.com
Barlow- and Shapley Lenses
| Photographical Converters / Barlow Lenses (all SMC Coated)
All prices include VAT
Converter RC1.4x67 (P) (for Pentax 67) sold
Converter RC0.72x35 (P) (for 35 mm SLR-camera) sold
Converter RC1.4x35 (P) (for 35 mm SLR-camera) sold
Converter RC2.0x35 (P) (for 35 mm SLR-camera) sold
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Please send requests or online orders to: sales@telescope-service.com
Refractor Telescopes
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Unlike most Apochromatic Refractors the Pentax refractors were designed to offer not only an outstanding image quality on the optical centerline, but also over the entire field of view. Even the smallest of the refractors, the Pentax 75 SDHF, is fully suited for the 6x4cm film format at highest quality. Of course all other Pentax refractors are also fully suited for this format.
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Pentax 75 SDHF
An excellent travel scope and rich field photographical instrument. 75/500mm
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Pentax 105 SDP
A powerful all purpose refractor with excellent visual and photographical performance. 105/672mm
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Pentax 125 SDP
An ultimate visual photographical instrument. 125/800mm
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Pentax 100 SDUF-II
No-compromise rich field visual and photographical telescope 100/400mm
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Pentax 150 SDP and Pentax 150 SD
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Pentax 75 SDHF
The Pentax 75 SDHF is an apochromatic refractor with a fully corrected, flat field for photography. Its three lens design offers pinpoint stars to the edge of a very large field (6x4cm film format). At the same time sharpness on the centerline is also excellent.
The third lens is a field flattener. You can therefore save the money on a separate field flattening lens that you have to buy for imaging with most other apochromatic refractors. The aperture is 75mm, the focal length is 500mm. The telescope is a very compact all-purpose instruments for amateur astronomers and a very powerful telelens for photographers.
Fields of Use:
Nature and Wildlife Use:
Even at the highest magnifications contrast and image brightness are exceptional. You will see tiny and otherwise difficult to detect details in the feathers of birds. The excellent image sharpness makes the Pentax 75 SDHF an excellent choice if you are looking for a spotting scope. Contrary to most spotting scopes the ability to take photos isn't just an afterthought in the Pentax 75 SDHF.
Astronomical Use:
The Pentax 75 SDHF is an excellent all purpose telescope. It is perfectly suited for rich field observations as well as high power planetary use. Apochromatic refractors are famous for their excellent image sharpness and contrast. You will be surprised by how much you can see at "only" 75mm aperture. Unlike most apochromatic refractors the Pentax 75 SDHF was also designed specifically for photography. A field flattening lens is integrated into the telescope design and offers pinpoint stars to the edge of the 6x4cm film format.
Photography:
One of the main advantages of the Pentax 75 SDHF is its uncompromised photographical performance. The telescope offers a flat photographical field that fully illuminates the 6x4cm film format. Even towards the edges you will still have pinpoint stars. All this turns the Pentax 75 SDHF into a powerful telelens with a focal length of 500mm and a focal ratio of f/6.7 with a perfectly corrected field. We warmly recommend this telescope for demanding amateur astro-photographers as well as nature photographers. In our opinion no other telescope with a similar photographical performance in this price range.
Many owners have taken impressive images of the milky-way and other extended objects. We will try to publish some of these on our website. If you would like to have one of your images published here please contact us! |
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Basic version with 1.25" straight through adaptor - the tube ring and tripod are not included in the basic set
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Scope of Delivery:
The scope of delivery consists of the optical tube with an aperture of 75mm and a focal length of 500mm. The focuser is a very good shifting free rack and pinion focuser with a clear diameter of 60mm.
The dewcap is retractable for smaller storage dimensions. The tube ring is available separately and is not included in the normal scope of delivery.
The excellent rack and pinion focuser is optimized for photography. Adaptors are included for straight through observing with 1.25" eyepieces. If you want to use a star diagonal you will need a special adaptation that is available optionally:
1.25" and 2" Adaptors from TS
We offer special 2" and 1.25" adaptors with a short optical length for the Pentax 75 SDHF. With the original adaptors you cannot reach focus with a star diagonal.
The focal plane is optimized for photography. It is sufficient for the use of 1.25" accessories with a 1.25" star diagonal. 2" accessories can be adapted based on the Baader T2 diagonal. The clear diameter is then approx. 38mm. Further details on this adaptation on request. |
Please send requests or online orders to: sales@telescope-service.com
Pentax 105 SDP
Like most Pentax refractors the Pentax 105 SDP was designed both for visual and photographical use. This true apochromatic refractor excels in both fields.
Optical Performance
On the optical axis the Strehl ratio lies between 96 and 97%. This is far better than diffraction limited (80% Strehl). What sets the Pentax 105 SDP apart from most other refractors is its excellent image quality over the entire field. This allows demanding astro-imaging with high resolution over a large (6x7cm) film format. On axis you can observe and photograph the moon and the planets with extraordinary detail and contrast. The colour correction is excellent - even at very high magnifications nearly no false colour can be seen. |
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The Optical Layout
The excellent optical performance of the Pentax 105 SDP is due to its special four lens design.
A doublet objective lens offers an excellent on-axis image quality. The integrated two-lens corrector offers a large, flat field both for visual and in particular for photographical purposes. No expensive separate field flattener is needed.
The front lens of the doublet objective is made of SD glass, the third lens in the layout is made of ED glass. The selection of the right glasses is a key factor for achieving excellent optical properties of the telescope.
Of course all optical surfaces feature the excellent Pentax SMC multi-layer coating. |
Photographical Use
The Pentax 105 SDP is excellently suited for demanding astro-imaging. Whether you need a particularly high resolution for CCD imaging or a fully corrected field over the large 6x7cm format, the Pentax 105 SDP offers excellent results in all these fields.Specifications
Aperture 105mm ... Focal length 672mm ... 4 lens layout in two groups ... Tube length 741mm ... Tube diameter 115mm |
Focuser of the Pentax 105 SDP
The Pentax 105 SDP has an excellent focuser with a free diameter of 94mm. This allows full illumination of the 6x7cm film format. Of course the focuser is free of image shift. Focus travel is 62mm. |
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Prices:
| Item No |
Short description |
Price - Euros incl. VAT |
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105 SDP |
True apochromatic refractor - 105/672mm
Optical tube, focuser - no tube rings |
sold |
| PE 105 Koffer |
Aluminium case for Pentax 105 SDP |
sold |
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Please send requests or online orders to: sales@telescope-service.com
Pentax 125 SDP
Image: Pentax 125 SDP Apochromat on Orion Sky Pro mount - a portable setup
Like most Pentax refractors the Pentax 125 SDP was designed both for visual and photographical use. This true apochromatic refractor excels in both fields.
Optical Performance
On the optical axis the Strehl ratio lies between 96 and 97%. This is far better than diffraction limited (80% Strehl). What sets the Pentax 105 SDP apart from most other refractors is its excellent image quality over the entire field. This allows demanding astro-imaging with high resolution over a large (6x7cm) film format. On axis you can observe and photograph the moon and the planets with extraordinary detail and contrast. The colour correction is excellent - even at very high magnifications nearly no false colour can be seen. |
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The Optical Layout
The excellent optical performance of the Pentax 125 SDP is due to its special four lens design.
A doublet objective lens offers an excellent on-axis image quality. The integrated two-lens corrector offers a large, flat field both for visual and in particular for photographical purposes. No expensive separate field flattener is needed.
The front lens of the doublet objective is made of SD glass, the third lens in the layout is made of ED glass. The selection of the right glasses is a key factor for achieving excellent optical properties of the telescope.
Of course all optical surfaces feature the excellent Pentax SMC multi-layer coating. |
Photographical Use
The Pentax 125 SDP is excellently suited for demanding astro-imaging. Whether you need a particularly high resolution for CCD imaging or a fully corrected field over the large 6x7cm format, the Pentax 125 SDP offers excellent results in all these fields. |
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Specifications:
| Aperture |
125mm |
| Focal length |
800mm |
| Focal ratio |
1: 6.4 |
| Diameter of fully illuminated field |
88mm - corrected flat field |
| Optical Layout |
4-lens SMC-coated apochromatic refractor with integrated field flattening lens for 6x7cm film format |
| Tube diameter |
140mm |
| Weight |
10kgs |
| Tube length |
922mm |
Each glass-to-air surface of the Pentax 125 SDP features the excellent Pentax SMC multi-layer coating. Sophisticated internal baffling maximizes contrast.
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The Focuser of the Pentax 125 SDP
The focuser of the Pentax 125 SDP is a very precise helical focuser.
The free diameter of this focuser is 90mm. This allows full illumination of the 6x7cm film format.
A large and ergonomical grip allows comfortable and precise focusing.
Focusing precision is particularly high with this focuser. A scale on the focuser allows setting with a precision of 0.01mm or better.
The focuser is ideally suited for serious astro-imaging. |
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Prices:
| Item No |
Short description |
Price - Euros incl. VAT |
| PE
125 SDP |
True apochromatic refractor - 125/800mm
Optical tube with helical focuser - without tube rings
With aluminium case |
sold |
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Please send requests or online orders to: sales@telescope-service.com
Pentax 100 SDUF
The Pentax SDUF is an extremely powerful photographical telescope for large format astro-imaging.
The Pentax 100 SDUF-II is a no-compromise telelens for astro-imaging. With its integrated corrector / field flattener it offers an excellent image sharpness over the entire field (airy disks < 20um even at the edge). Colour correction is very good considering its extreme focal ratio of f/4.0, although critical users will of course detect some secondary spectrum. However, we know no other telescope that packs a similar photographical performance in such a small packet if you need a large corrected field.
Optical Performance
Image quality is very good over the entire, huge corrected photographical field. The real Strehl ratio is still above 90% which is astonishing for an instrument of this extreme focal ratio. As a result the 100 SDUF-II is not only an ultimate telelens for photography, but also a wonderful, ultra-compact travel scope. |
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The Optical Layout
The excellent optical performance of the Pentax 100 SDUF-II is due to its special four lens design.
A doublet objective lens offers an excellent on-axis image quality. The integrated two-lens corrector offers a large, flat field both for visual and in particular for photographical purposes. No expensive separate field flattener is needed.
The front lens of the doublet objective is made of SD glass. The selection of the right glasses is a key factor for achieving excellent optical properties of the telescope.
Of course all optical surfaces feature the excellent Pentax SMC multi-layer coating. |
Aluminium case of the SDUF-II. Perfect for transportation and storage.
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Specifications:
| Aperture |
100mm |
| Focal length |
400mm |
| Focal ratio |
1:4.0 |
| Diameter of fully illuminated field |
88mm - corrected flat field - airy disk < 20um |
| Optical Layout |
4-lens SMC-coated apochromatic refractor with integrated field flattening lens for 6x4.5cm film format |
| Tube diameter |
115mm |
| Weight |
4.0kgs |
| Tube length |
492mm |
| Dimensions of aluminium case |
476mm x 162mm x 159mm |
| Weight of aluminium case |
2.3kgs |
Each glass-to-air surface of the Pentax 100 SDUF-II features the excellent Pentax SMC multi-layer coating.
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The image shows the focuser's fine focus scale. The nonius is very precise and is a great help for finding focus quickly.
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The Focuser of the Pentax 100 SDUF-II
The focuser of the Pentax 100 SDUF-II is a very precise helical focuser.
The free diameter of this focuser is 84mm. This allows full illumination of the 6x4.5cm film format.
A large and ergonomical grip allows comfortable and precise focusing.
Focusing precision is particularly high with this focuser. A scale on the focuser allows setting with a precision of 0.02mm or better.
The focuser is ideally suited for serious astro-imaging. |
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Prices:
| Item No |
Short description |
Price - Euros incl. VAT |
| PE 100 SDUF |
Pentax SDUF-II 100/400mm apochromatic refractor
Optical tube with helical focuser - without tube rings
With aluminium case |
sold |
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Please send requests or online orders to: sales@telescope-service.com
