Recently I was very fortunate to be offered a very fine condition "complete setup" TV Genesis SDF with Everbrite Diagonal and excellent TV finder - with Gibralter and Skytour included. I've been reading as much on The TV Petzval design history as I can find, and it is always rated as an APO. :S
I realize that 15 years after this model appeared other more exotic glass became available and reinvented what was considered a true APO as of today's standards. I've used it with my Nagler 7mm, TMB 4mm and various ep's with my TV 2x barlow and when I looked at the moon there was no color. Ditto on Sirius on that particular night. I read that this fine scope can handle over 60x per inch and deliver sharp contrasty viewing. Then I read that the NP101 is "color free". 8O
If mine is an APO and the TV101 is an apo and now the NP101 is also an APO, what is the difference and how much better can these fine scopes get before they reach "trans-warp" :-) speed on the viewing scale.
....Can someone explain to me how these can all be APOs and yet the "new" ones are considered better and they are also APOs?
(In any case, I love viewing with this scope).
I realize that 15 years after this model appeared other more exotic glass became available and reinvented what was considered a true APO as of today's standards. I've used it with my Nagler 7mm, TMB 4mm and various ep's with my TV 2x barlow and when I looked at the moon there was no color. Ditto on Sirius on that particular night. I read that this fine scope can handle over 60x per inch and deliver sharp contrasty viewing. Then I read that the NP101 is "color free". 8O
If mine is an APO and the TV101 is an apo and now the NP101 is also an APO, what is the difference and how much better can these fine scopes get before they reach "trans-warp" :-) speed on the viewing scale.
....Can someone explain to me how these can all be APOs and yet the "new" ones are considered better and they are also APOs?
(In any case, I love viewing with this scope).
10" Teleport (R2D2 Jr.)
Celestron Evolution 60th Ann
Canon IS 10x30 bino
Starbase80
E.S. Voyager
Explore Scientific ep's
Wonderful Rescued Greyhound
(Understanding Wife)
