it is correct that I removed the 75 degree specs from the product side. U.O. was also able to remove the 75 degree print from the stock eyepieces.
I have meanwhile clamped the eyepiece on my measuring apparatus. I measure 66.5° apparent field of view at 10 and 12mm. At 7.7mm it may be just under 67° and at 15.4mm it is 65.9°.
If one had the calculation of the eyepiece, then one would certainly take the SGF from the calculation. I measure it by measuring the angle at which a laser shines into the eye lens and still comes through the eyepiece. This does not take into account the entrance pupil of the telescope, but that is not fixed anyway.
Everybody who pre-ordered has of course the right to cancel and ask for a refund. It was clearly my fault not to check this spec for that FOV , period :-(
It has not the promoted 75 degree, period
however I still defend this eyepiece as one of the best on the market, still very in-expensive compare to what it delivers.
It delivers :
- slim body for binoviewing
- conical top for binoviewing
- high eyerelief
- tread to use Dioptrix
- click stop
- great edge performanc even in F/3.6 dobsonian
- almost no refocusing
- superb overal performance
- very comfortable wide field view
sorry for any trouble coursed
Edited by APM M.Ludes, 01 June 2022 - 06:22 AM.