Harry Siebert Optics Standard 12.5mm


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Harry Siebert Optics Standard 12.5mm
This eyepiece one of Harry's eyepieces in the 18/15/12.5/10mm series, all of which share the same simple 3 lens design (configuration unspecified). It performs identically to the 18mm and 10mm, just at a different magnification. See my comments under those eyepieces for details. A high performance eyepiece at a give away price. The Orion Nebula in my friends Meade 4500 were absolutely astounding with cloud tenticals extending beyond the FOV. Some structure within the nebula was starting to become apparent. Edge performance in my 8" f/6 seems to be the best in this eyepiece. The eye relief, although unchanged from the longer focal lengths, is more typical for a Plossl this focal length and therefore more acceptable.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Harry Siebert Optics Standard 12.5mm
the closer I got to the horizon and the glare from the city lights, when
compared to a 12.5 Plossl and a 12.5 Orthoscopic it's performance got worst,
contrast mainly. But the higher in the sky, further away from the sky glow
of city lights, when compared to the two other 12.5 the better its
performance got. This has left me with the feeling that it doesn't like
light pollution, high in the sky it was better performer in all regards than
the 12.5mm Plossl hands down and almost as wide as field as my 20mm Plossl.
It had nice pin point sharp stars in the centre and the contrast where both
comparable to the 12.5 Orthoscopic until 1/3 away from the edge of the
field, the images started to loose their pinpoint shapes, they where still
points of light but not that nice pinpoint. No false colour. The impression
I got is that under dark sky's this eyepiece is a real
performer, but under my light polluted sky's in my backyard, well it is
better than my 12.5 Plossl if I keep out of the sky glow just up from the
horizon. Overall, still a very nice eyepiece and the price is very good.

Overall Rating: 8
Weight: 1 (Unreliable Vote)
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=44065


Harry Siebert Optics Standard 12.5mm
You can see my comments under the 10mm i have comments on this eyepiece there.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
Date:
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=44066


Harry Siebert Optics Standard 12.5mm
You can see my comments on this eyepiece under the 10mm.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
Date:
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=44018


Harry Siebert Optics Standard 12.5mm
this is an outstanding eyepiece. compared to naglers and panoptics it has a smaller field and edge sharpness not quite as good. But, we though it had better contrast, and sharpness. we could see fainter planetary detail. The field is very decent and eye relief good if you don't need eyeglasses. the field is also color free even on the moon. When you consider the price this is a best buy.


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Harry Siebert Optics Standard 12.5mm
Very impressed. For the price it is a steal. The focus across the field is very good and I did not notice any ghosting. I purchased this eyepiece as a widefield eyepiece for use on deep sky objects and feel I will be pleased though I have not had it out of the city yet. It is not threaded for filters though so that may be a problem for some. I use a refractor though with a 2" diagonal and 2" filter in it so it is no problem for me. Eyepiece did not seem to add any false color and it is brighter than my 12mm plossl. For an inexpensive wide field I would say this is deffinately a very nice eyepiece.

Overall Rating: 9
Weight: 1 (Unreliable Vote)
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=44068


Harry Siebert Optics Standard 12.5mm
Unbelievably clear w/very, very little distortion near edges. Seems to focus more easily too in my Meade 114mm Newtonian reflector.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Harry Siebert Optics Standard 12.5mm
These do have a provision for light filters.

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Harry Siebert Optics Standard 12.5mm
a good ep for the money. decent veiws show's alot of color on planet's. a good addition for any planet hunter. thanks bob and pam hart

Overall Rating: 8
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Harry Siebert Optics Standard 12.5mm
I agree with the above comments. The comments about Orion are espescially true. Very impressive even in town. Like Harry's other eyepieces this one doesn't show any colors that aren't. Very happy and I would buy it again.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Harry Siebert Optics Standard 12.5mm
As others have pointed out this is a nice eyepiece for viewing the planets. Color and sharpness are very good. Eye relief is good enough that using ep is comfortable.
The eyepiece is also rather light so if you are using a scope like the 8" or 10" Meade Starfinder that need to be very well balanced this ep as well as most of Harry's ep's really help.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=44071


Harry Siebert Optics Standard 12.5mm
Harry makes some great eyepieces for a small amount of money-- the 12.5 mm WA is my most-used eyepiece for planets, the Moon and star clusters. Great contrast, excellent eye relief and no hit of color aberration.

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Harry Siebert Optics Standard 12.5mm
Ive had this eyepice for a while now and its been in many of our clubs telescopes, the longer the focal lenght of the telescope the better it is, we found above f/6 this eyepice really starts to give great images, below f/6 its still a very good eyepiece, But when we put this eyepiece in a 102 Tele Vue refactor we can bearly fault it. In a 4 inch APO its image quality is equal and sometimes better than the best brands like Tele Vue, Pentax and Tak's to name a few. In fast Dobs its very good but a 12.5mm UO ortho is slightly better on all areas of image qualty except for FOV. In SCT's it preforms the poorest, but still better than some of the cheaper Plossls, when I comment on preformance I mean evrything from coma sharpness of stars etc, colour correction. The feid of view is very nice, for the price you will be hard to find better.

Overall Rating: 9
Weight: 3 (Unreliable Vote)
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Harry Siebert Optics Standard 12.5mm
HARRYS 12.5MM WA IS BETTER than the 12mm U.O. orthoscopic anyday. the fov in my f/9 scope is almost pinpoint stars to the edge. The eye relief is Ok and the eyepiece is very light. I feel the contrast and the brightness is superd. thanks harry telescope8@hotmail.com

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Harry Siebert Optics Standard 12.5mm
( -> See my comments for Siebert's 10 mm wide angle)
I strongly recommend this EP to everyone (without glasses). Even without considering the price I give a 10!

Overall Rating: 10
Weight: 3 (Unreliable Vote)
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=44022


Harry Siebert Optics Standard 12.5mm
I am using this eyepiece on a f5.4 TeleVue Genesis SDF and when I asked Harry Siebert which one of his eyepieces he suggested for a wide field scope like mine, the 12.5 was *not* one of them. I bought one anyway :) One of the reasons I think he did not include it in his list for fast scopes is probably related to my only real complaint. That complaint is that the edge of field in this wide-angle eyepiece shows moderate distortion. That being said, the views in 80% of the rest of the field are excellent. This is a very sharp eyepiece! Contrast was also very good. Eye relief was surprisingly good (non-eyeglass wearer...at least while observing) Mechanical construction of the piece is an "interesting" home brewed affair, but functional. Like every other review, I must say this eyepiece is a bargain. If I had to compare it to another eyepiece, I'd say it is a small step above the very good Orion Ultrascopic.

Overall Rating: 9
Optics:7 Value:10
Weight: 10 (Trustworthy Vote)
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Harry Siebert Optics Standard 12.5mm
Way to go Harry! This is one great hs eyepiece! great clarity & contrast! this one is highly recommended!

Overall Rating: 9
Optics:9 Value:9
Weight: 10 (Trustworthy Vote)
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=109106


Harry Siebert Optics Standard 12.5mm
I've been using my Siebert 12.5 for several months now. This is a very nice eyepiece. No color, sharp and clear right to the edge. Does very well when used with a barlow. Definitely outperforms the eyepieces that came with my Orion 8" SVD. Additionally, Harry Siebert is a pleasure to do business with. I highly recommend this product.

Overall Rating: 10
Optics:9 Value:10
Weight: 10 (Trustworthy Vote)
Date:
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=111676


Harry Siebert Optics Standard 12.5mm
Outstanding planetary eyepiece. Nice and sharp all the way to the edges. I also use this eyepiece on globular clusters. If you want an outstanding planetary eyepiece, than get one.

Overall Rating: 10
Optics:10 Value:10
Weight: 10 (Trustworthy Vote)
Date:
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=135528


Harry Siebert Optics Standard 12.5mm
This eyepeice has quite a large glass for a 12.5mm eyepeice. The eye relief is very comfortable. I use it in an 4" off axis reflector that is probably the least forgiving telescope you can put an eyepeice in as there is no false color and no diffraction spikes. The HS 12.5mm shows a slight bit of color on bright planets, but none on the moon and only a little on very bright stars. It also losses a very little bit of sharpness toward the last 5deg of fov. Considering the great eye relief and wide 65deg fov with this price it is almost too good to believe. The Moon through my DGM 4.0 with this occular is everything you own a telescope for.

Overall Rating: 10
Optics:9 Value:10
Weight: 5 (Veritable Vote)
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=175336

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