University Optics Orthoscopic 25mm


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Brand and Model:University Optics Orthoscopic 25mm
Price ($USD):$55.95
Type:Orthoscopic
Focal Length:25 mm
Barrel Size:1.25 in
Apparent FOV:45.0 degrees
Field Stop Dia.:0.0 mm
Eye Relief:20 mm
Elements:4
Weight (lbs):
Description:

Vote Highlights Vote
University Optics Orthoscopic 25mm
Another fine addition to my recent purchase of the 4,6 +18mm University Optics Classic Abbe orthos. Test revealed a sharp to the edge field of view with a nice bright image with good contrast. Can't wait to do some viewing with this fine ep on my favorite Messier, NGC,IC,Stock and Trumpler catalogue objects- open/rich clusters and globs with my 6" refractor. It should do well on picking out faint galaxies at a dark site due to it's high level of light transmission and contrast. Good construction and baffling and nice quality coatings noted.


Stan Taylor Vancouver B.C.

Overall Rating: 10
Optics:9 Value:10
Weight: 10 (Trustworthy Vote)
Date:
By: steamer
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=494767


University Optics Orthoscopic 25mm
For use in a binoviewer, I bought sets of UO Orthos from the 25's down to the 7's and I love them all. Being mainly a deep-sky observer, I decided to try the Orthos for planetary use & have not been disapponted.

The 25 has ample eye-relief & is comfortable to use, even with glasses. Star images are sharp across the field and the contrast is very good. Once in a while I'll notice a slight amount of glare, or a reflection from my own eye, but only at certain angles, and I don't find it bothersome.

These are great in a binoviewer because the apparent field using two eyes feels more like 55-60 degrees rather than the 45 degrees as seen when in single mode. The 25's are excellent in this capacity for lunar, planetary, or globular clusters. Great in single mode for too for large planetaries or smaller emission nebulae.

For only $60 they can't be beat, especially when needing to purchase two for a binoviewer. Great eyepiece.

Overall Rating: 9
Optics:9 Value:10
Weight: 10 (Trustworthy Vote)
Date:
By: ckw1astro
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=359270


University Optics Orthoscopic 25mm
Twenty five years ago when one wanted a planetary eyepiece one reached for an ortho. Plossl's were un-heard of. After all those years when I want the sharpest views on anything, not just planets, I use an ortho. The only thing you give up to a plossl is a little field of view. Ortho's have sligtly better eyerelief, less edge distortion, and are sharper and exhibit more contrast than plossl's. And the best part is the fact that they are relatively cheap. I just wish they came in an even wider range of focal lengths. Before you plunk down hundereds of dollars on some piece of "wonder glass" give U.O. ortho's a try. You will not be dissapointed. The only time I use the widefield eyepieces is at extremely low power when I'm looking for faint fuzzies. The rest of the time I go with an ortho.

Overall Rating: 10
Optics:10 Value:10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.127.247)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=377981


University Optics Orthoscopic 25mm
I bought the UO 25mm ortho as part of a set of four, including 12.5mm, 7mm, and 4mm (each reviewed respectively). I use these eyepieces with a small, off-axis dob (4" F/10).

Clean, simple, and lightweight, I use the UO 25mm ortho on a DGM Optics OA-4 for low power. At F/10, the field of view is flat to the field stop and sharp. On a 1010mm focal length scope, I find the 25mm useful both as a finder and as an observing eyepiece for larger deep sky objects. While presenting a narrow field of view, what is there is sharp. To ease tracking on my small dob, I don't hesitate to start viewing an object well off axis and let it drift through the entire field of view.

I give the optics a 9 only because I've heard that Zeiss and Pentax orthos are even better. Frankly, these no-nonsense, solid little eyepieces strike me as flawless. Value is obviously a 10 and overall 9, only because I think it would be nice if they had integral eyecups.

The Orion full eyepiece cups work well and pretty much eliminate any blackout problems some reviewers note on the 25mm.

Overall Rating: 9
Optics:9 Value:10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.50.36)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=131087


University Optics Orthoscopic 25mm
Nice EP for the price. Very sharp. FOV is fine when used by itself. Difficult to use with my Celestron 2x Ultima barlow - eye position is very critical to avoid blackout.

Overall Rating: 9
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.190.204)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=43320

>Nice EP for the price.  Very sharp.  FOV is fine when used by itself.  Difficult to use with my Celestron 2x Ultima barlow - eye position is very critical to avoid blackout.


If you use a Klee 2.2x Barlow you will not have the problem you describe as having with the Celestron Ultima.

University Optics Orthoscopic 25mm
I have four eyepieces that I use with my 8" Dob and my 90mm RFT: two U orthos and two Orion Sirius Plossls. I bought the 25mm ortho to replace the cheesy 25mm Plossl that came with my Dob and to use when lighting conditions restrict exit pupil requirements. (At dark sites, I usually use a 32mm Pl). The 25mm ortho is sharper and shows more contrast than the Plossls (and the Plossls are pretty good.) It is my favorite over all EP. I do not know why these orthos have fallen out of favor recently or why there has been a mass rush to Plossls. Frankly, within their size limits, U orthos are superior to good Plossls for sharpness and contrast, which I find far more important than a very slightly wider apparent field. I only wish they came in sizes bigger than 25. I understand that its Japanese optics are consistant in quality. At a hundred bucks, this would be a bargain. As it is, they are less than $60. Also, it came in the mail 36 hours after ordering it. (My 12mm ortho came the day after placing the order). My only caveat is that if you are going to use one in the burbs, get a rubber eye cup for it. UO does not supply one.

Overall Rating: 9
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.204.146)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=43319


University Optics Orthoscopic 25mm
Of all the UO Ortho's this is the only one that gets over looked when I need a 25mm eyepiece. I prefer the 25mm TV Plossl over this eyepiece. Despite that it is very sharp and provides good views. I gave this one a 9 because the narrower FOV is a negative for a low power eyepiece compared to the TV Plossl.

I use a 10" f/4.5 Dob. I've tried a few Celestron Ultimas, TV Plossls and UO Ortho's to find a set of affordable eyepieces for a fast scope that would work well and provide good views. All without having to spend a house payment on an eyepiece. All of the UO Orthos work well in my fast Dob. I will not part with them. These make a for a good solid performing workhorse set of eyepieces. And contrary to what some folks say they will go head to head with the high dollar eyepieces and fair very well against them too. I own a 9mm Nagler, but my favorite eyepiece in my scope is the 9mm UO Ortho. The Nagler just sleeps in the eyepiece case, while the UO Ortho studies the H400. It's a purposeful choice. They have sharp, contrasty, well corrected views.




Overall Rating: 9
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.74.34)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=43318


University Optics Orthoscopic 25mm
cannot find a problem in this eyepiece

Overall Rating: 10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.176.11)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=43317


University Optics Orthoscopic 25mm
Great eyepieces, see comments under 12.5mm

Overall Rating: 10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.251.197)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=43315

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