2 William Optics 28mm Uwa 82 Degree Eyepiece Review

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William Optics ii" UWAN Series Eyepiece - 28mm

Make	William Optics
Role Number	E-UWA28
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Manufacturer Description

Beautiful Ultra Wide Angle (UWA) Eyepiece, for beautiful observation sessions with your telescope. This vii-element UWAN eyepiece is platonic for rich-field observations at medium-loftier power.Extremely adept price for its quality: expect effectually and compare! Platonic for fast focal ratio telescopes (Dobsonian, etc.)

Super Wide FOV
Outstanding ultra-broad field of view: 82 deg. F.O.V.
Fully MultiCoated lenses for excellent calorie-free transmittance.
Reduced chromatic aberration.
Improved contrast compared to similar EPs.

Great Contrast
Internally fully blackened (lenses edges and internal spacers)
No flaring or ghosting on high-contrast objects.
Parfocal

Light and Easy
Innovative twist-upwards condom eyecup.
Long eye-relief: 12mm.
No internal reflections, kidney beaning or other distracting distortions.

Terrific Fit and Stop
High-resistance anodized black butt.
Smooth design for no hook up in your focuser.
Threaded for use with i.25" filters.

Reviews

5.0 (Based on one Reviews) 100% of reviewers recommended this production.

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1. Time with Product

   Unknown

   User Notes:

   Review by Joplin of South Carolina.

   5.0 28mm UWAN Performance

   Pros:

   Huge true field of view,Sharp images

   Cons:

   Eye position not perfect,Very Big Heavy

   Comments:

   I started looking seriously for an Ultrawide angle eyepiece with excellent performance when I acquired a xvi" Meade Lightbridge. At F/4.5 my 40mm WO Swan eyepiece wasn't going to piece of work well - an 8.9mm exit pupil was just too much waste of light gathering. I considered a 26mm Nagler but decided it was just besides expensive. I chose the William Eyes 28mm UWAN which was available for nigh half the price of the 26mm Nagler. I knew that coma would be a trouble with a wide FOV eyepiece on the 16" F/4.5. The WO specs are a bit off on the effective field stop size for this eyepiece - I calculated information technology at 39.4mm which is all the same very large. I went ahead and purchased a Baader MPCC (blackout corrector) and the appropriate rings to apply it with the 28mm UWAN.

   The 28mm UWAN is an exceptionally well corrected eyepiece - I could tell correct away from the views through my 4" F/7.7 refractor. Stars are perfect all the way to the border of the field of view. Contrast is fantabulous and no ghosting was noticeable even on the Moon. When used with the 16" F/4.5, a coma corrector is a requirement with 28mm UWAN. Without the coma corrector anything across the inner 1/3 of the FOV shows noticeable coma. I have 20mm T5 Nagler and its performance is like (about 1/2 the FOV is usable, the balance shows coma). The worse functioning of the 28mm UWAN is to be expected since it has a much larger true field of view compared to the 20mm Nagler. Fortunately the Baader MPCC does an excellent job of eliminating coma. The MPCC / 28mm UWAN combination yields pinpoint stars all the way to the edge of the field using a 16" F/4.5. 1 of my favorite things to practise with the 28mm UWAN is attach the MPCC and an OIII filter and cruise the Summer Milky way. The Veil, Crescent, Swan, Lagoon, and Trifid nebulas are all stunning with this combination.

   The just bug with this eyepiece are weight (I call it the Kilomonster since it weighs just under 1 kilo or 2.2 lbs) and eye positioning. I don't have a problem with the eyepiece positioning but the eyecup is quite big and you accept to plow your head simply a bit to look through the eyepiece so some users may have problems with it. The weight is a bit of an issue if your scope is sensitive to balance or if you lot are using a pocket-size telescopic. Overall though, I wouldn't hesitate to recommend this eyepiece peculiarly because the bargain price compared to the Nagler alternatives.

   Bottom Line: Would you recommend this item? Yes

   Was this review helpful? Yes / No

   This review was provided courtesy of AgenaAstro.com

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Specifications

Credible Field of View	82°
Barrel Size	2" (fifty.8mm)
Bolt Case Included	Discontinued Particular
Bolt Case Size	Agena 85x120mm
Coatings	Fully Multi-Coated
Stop Caps	two
Heart Relief by Design	18mm
Field Cease Diameter	43.5mm
Filter Threads	Standard ii" Filter Thread (M48 x 0.75)
Focal Length	28mm
Lens Elements	6
Lens Groups	4
Parfocal	Yep
Prophylactic Centre Guard	Yeah (Twist-Up Eyecup)
Blackened Lens Edges	Yeah
Manufacturer	William Optics
Eyepiece Focal Length	20.1mm - 30mm
Eyepiece Field of View	Over 80 degrees
Eyepiece Series	William Optics UWAN
Barrel Type	Tapered barrel
Eyepiece Weight	35.27oz (i,000g)

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Source: https://astronomyconnect.com/items/william-optics-2-uwan-series-eyepiece-28mm

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