Quote:
Originally Posted by gregbradley
Apparently a highly corrected doublet is possible - Agema doublets.
https://www.agemaoptics.com/
The graph comparing various high end refractors is interesting.
Greg. |
Hi Greg,
I can appreciate that modern technology and glass types have allowed for the design and construction of better and shorter doublets in more recent years, but you still can't defy the laws of physics.
These aren't short doublets BTW. The 120mm is F8.7.
The comparison graph is interesting and puts it on a pedestal above some pretty high end gear, namely the 130mmm Zeiss APQ and the Takahashi TSA 120. Both are a fraction faster at F7.7 and F7.5 respectively, but they are both the top of the crop in terms of Triplet APO's. I would really like to see some independent test data. I could be wrong, but I am suspecting the marketing department had some influence on these tests
Cheers,
John B