Harry Siebert Optics Ultra 19mm, 1.25 inch

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Brand and Model:Harry Siebert Optics Ultra 19mm, 1.25 inch
Price ($USD):$119.00
Type:Misc Wide Angle
Focal Length:19 mm
Barrel Size:1.25 in
Apparent FOV:70.0 degrees
Field Stop Dia.:0.0 mm
Eye Relief:20 mm
Weight (lbs):

Vote Highlights Vote
Harry Siebert Optics Ultra 19mm, 1.25 inch
These eyepieces are advertised as having "70+ degree FOV" and 20mm eye relief. I bought a pair of the eyepieces for use with a Binoviewer in my 9.25" SCT. I found the eyepieces lacking somewhat in both respects.

Using the "drift" method, and taking multiple samples, I found the FOV to actually be about 67 degrees, not 70+ (Procyon took 130 seconds to cross the field at 124X).

I also compared the eye relief to a Epic ED-2 and a Televue radian, both of which also have 20mm eye relief. Clearly the Siebert eye relief was less than the others. I'd say it's closer to 10-15mm. In order to see all the way out the the field stop, I had to press my eye firmly against the eyecup, which was about 12mm high. I would not recommend it for people who wear glasses at the eyepiece.

Optically, the eyepiece is very good. Very good contrast, and clear focus even at the edge of the field.

The body of the eyepiece is made from machined aluminum instead of steel, so it is much lighter than most eyepieces. This is especially ideal for binoviewers. However, I would recommend getting some nylon set screws for your diagonal or focuser, because the aluminum barrel can be easily marred by metal screws.

If the field of view and eye relief had been as advertised, I would give this eyepiece an 8.5 or 9.0.

Overall Rating: 8
Optics:8 Value:9
Weight: 3 (Unreliable Vote)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=360577

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