That looks cool. Any images of the sky you would share?
Ebay has this one in a shutter for 580. Commercial Ektar 14 in. Lens
That looks cool. Any images of the sky you would share?
Ebay has this one in a shutter for 580. Commercial Ektar 14 in. Lens
The SSXL 150 is an incredible lens but because of the design, there is considerable light falloff and you will need a CF. They are expensive. 150mm is very wide for 8x10 and I ended up selling mine.
Mosman, NSW (2014) by James Morris, on Flickr
So many choices yet so little. I need to review the info provided here to make a decision. Probably 120-150 mm range and an extar 14in and Voigtlander 12in Universal Heliar.
In astronomical terms, that is macro work you are doing
Expert in non-working solutions.
Steve, I guess that in your case you don't have to slightly refocus because stars are farther than moon, as moon is around 384.400km far yet.
Perhaps the effective focal length of your telescope changes because atmosphere is part of your optic system, for example the moon and solar discs are seen way larger when they are in the horizon.
Very Large Telecope (etc) is even automated to modify the optics (Adaptive optics) to overcome several atmospheric effects, including atmospheric turbulence, this is assisted by lasers.
https://en.wikipedia.org/wiki/Adaptive_optics
Last edited by Pere Casals; 1-Sep-2019 at 10:55.
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