mayoayo
Well-known member
Hello..I recently bought some inventory for the now closed Kowa distributor and technical service in Spain..I bought some interesting stuff,including body parts for the 820,that i really needed,because i have a home repaired back carcass in my 823, (and now ,at some point i will be able to replace it.).Other treasure i got is a fluorite objective cell for the 823..this is good,I can replace this valuable part if needed,but ,honestly i dont think it would happen,and i feel bad about having this nice objective wrapped in a piece of paper ..So i decided that i might try and build a telescope,..mmm..buy a tube,a focusser and use the 82 mm ,450 focal fluorite doublet to make a sweet apo refractor..I decided to ask for advice ,and i asked the guys from APM teleskopes in Germany,if they could suggest a way to build a telescope,and they answered with a sad dissapointing fact...They told me that kowa optics for the 823 are designed to work with the whole prism system and if used without the prisms (i can get those too)the optical performance of the objective would be poor,specially chromatic aberrations...
That answer surprised me ,because i thought prisms took quality away from the final image,but seems like optics design is a far more complex matter that i could ever figured...
So..It is this true for any spottign scope?..Are the objectives of a prismatic scope and an astro refractor really that different?
Thanks
That answer surprised me ,because i thought prisms took quality away from the final image,but seems like optics design is a far more complex matter that i could ever figured...
So..It is this true for any spottign scope?..Are the objectives of a prismatic scope and an astro refractor really that different?
Thanks