Quote:
Originally Posted by BadWolf
Thanks for the information Ken. Unfortunately my scope has nothing written on the lens element. I have pulled the element out (although the dew shield seems to not come off) and checked, but nothing. probably it is just a cheap Chinese scope from back then/ Maybe York got a bulk deal with someone in China?? Thanks anyway, Stewart
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Hello Stewart,
I have a 90/900 achromat myself, a Meade...
But I've only used it with an alt-azimuth, at least once, and after having blackened and flocked it throughout...
The Trapezium and its environs within the Orion nebula were absolutely stunning through it, and at 90x.
It almost meets the Sidgwick standard for colour-correction...
https://i.imgur.com/nEjoLHd.jpg
Still, close to the Sidgwick is quite good.
Admittedly, however, I prefer my 70/900...
...as it falls within the Conrady standard.
Enjoy.