Pentax 7mm XW Series 1.25" Eyepiece (70513)
Pentax 7mm XW Series 1.25" Eyepiece (70513)
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Clear, Comfortable Viewing Assured by 70° Apparent Angle of View and 20mm Eye Relief.
All Smc PENTAX XW-series eyepieces feature an extra-wide 70-degree apparent angle of view and an extra-long 20mm eye relief to deliver an exciting, wide-perspective image.
High-Grade Optics for Exceptional Image Quality.
The high-performance XW-series optics incorporates high-refraction, extra-low-dispersion lanthanum glass elements to produce a well-balanced image with minimal aberrations. It is particularly designed to reduce the disturbing blackout effect by effectively compensating the spherical aberration of the pupil.
PENTAX-Original Multi-Layer Coating for Outstanding Light Transmission Efficiency.
All lens surfaces that come in contact with air are treated with the original multi-layer coating, while all laminated surfaces are treated with the innovative partial coating, to offer the light transmission efficiency of more than 90 percent (an astonishing 96 percent at 550nm) over the visible light spectrum.
Advanced Light-Shielding Technology for Improved Image Contrast.
Thanks to PENTAX’s advanced computer simulation technology, the XW series features a light-shielding diaphragm at the most effective position to drastically reduce internal reflections for a brighter, higher-contrast image.
A Choice of Six Magnifications to Meet Specific Applications.
With six different magnifications (3.5mm, 5mm, 7mm, 10mm, 14mm, 20mm and the new 30mm and 40mm) to choose from, the XW series accommodates a wide range of both casual and specialized applications.
Weatherproof Construction for All-Weather Viewing.
The XW series features JIS Class 4 weatherproof construction,* making it possible to use it in drizzle or under night dew.
* The XW-series eyepieces are not designed for underwater use and should not be submerged under water.
Standard Eyepiece Sleeve and Built-In Adapter-Mounting Screw
The XW series provides a choice of two installment diameters: American-standard 1.25″(31.7mm) version, and 2″ (50.8mm) version. When you remove the screw-on eyecup, the XW30-R and XW40-R models provide a screw thread with a 48mm diameter and a 0.75 pitch, while other models provide a screw thread with a 43mm diameter and a 0.75 pitch.
|Eyepiece Lens:||8 elements||8 elements||8 elements||7 element||7 elements||6 elements||7 elements||6 element|
|Lens Structure:||5 groups||5 groups||6 groups||6 groups||6 groups||4 groups||6 groups||5 groups|
|Apparent Field of View:||70˚||70˚||70˚||70˚||70˚||70˚||70˚||70˚|
|Attachment Diameter:||1.25” (31.7mm)||1.25” (31.7mm)||1.25” (31.7mm)||1.25” (31.7mm)||1.25” (31.7mm)||1.25” (31.7mm)||2” (50.8mm)||2” (50.8mm)|
|Field Stop Diameter:||4.3mm||6.2mm||8.8mm||12.4mm||17.6mm||24.0mm||36.2mm||46.5mm|
|Eyepiece Ring:||Helicoid type||Helicoid type||Helicoid type||Helicoid type||Helicoid type||Helicoid type||Helicoid type||Helicoid type|
|Height & Width:||5.4”x2.4”||5.0”x2.4”||4.7”x2.4”||4.3”x2.4”||3.8”x2.4”||3.4”2.4”||4.8”x3.0”||4.6”x3.0”|
|Weight:||14.3 oz. (405g)||14.0 oz. (395g)||13.8oz. (390g)||13.8 oz. (390g)||12.9 oz. (365g)||12.6 oz. (355g)||26.1 oz. (740g)||24.7 oz. (700g)|
I’ve just started using these in an f/4.7 10” Dob. Nice clean field of view, excellent eye relief for eyeglass wearers. Also nice wide field and comfortable to view through and see whole field without any kidney bean effects. The seeing hasn’t been the greatest and I’m not often under perfect dark skies, but anticipate using this more under ideal conditions as they come up.
The 7mm XW is my first experience with Pentax, and my expectations were high. My other eyepieces are Tele Vue and Baader Morpheus, though I've also used Meade, Celestron, Astro Tech, etc.
The XW7 is a big, no nonsense eyepiece. About the same size as the 9mm Morpheus but feels more substantial. In my 12" Dobsonian, it gives a nice, wide view which snaps to focus right across the field. The long eye relief means you need to get your eye at the right distance, which is easy with the twist-up eye guard. The guard has a lot of range and it stays where you set it, so you don't need to fiddle with it every session. It is comfortable to look through, though the thick rubber eye cup gets colder against the skin than the Tele Vue eye cups.
In terms of comfort and eye positioning, I would rate this ahead of Morphues but slightly behind Delos and DeLite. Those are hard to beat. I think it matches the sharpness and contrast of the Morpheus, with less lateral colour. It is good on the moon and planets but even better on planetary nebulae like M27 and M57.
Here are two afocal moon shots I took with my iPhone and XW7 through a small refractor.
I purchased the 30mm, 14mm and 7mm for my first upgrades for my telescopes and I don’t think I’ll need to upgrade anymore. I’m very happy with my purchase of all 3 eyepieces.
I haven't been able to use this item due to winter gales and rain in the PNW. However, the item came to me in good order and in good time considering shipment to Vancouver Island. I have had nothing but excellent service over four separate purchases since the New Year. As far as the eyepiece goes, what needs to be said about the fabulous Pentax XW series? They have a solid and enviable reputation. There are many who have all of the series because they have become obsessed with owning among the very best.
Item arrived in the expected time. They are quick to answer inquiries as well. I will be doing business here again.