The friendly people at Amazon offer a nice variety of astro 2inch UV/IR cut filters (aka lumincance).
Even though they're not an astro shop! How nice.
Product ranges from $25 svbony to $135 baader.
- Where is the sweet spot between price & quality?
- Do the cheap ones perform? (or are they just cut bottoms from beer bottles?
I plan to use the 2" filter in the ZWO Canon adapter filter drawer very close to the focal plane (meaning only small local diameter of the filter glass will intersect the ray bundle to each point in the focal plane) So I am not expecting a huge problem with glass flatness (1/2L over a local area is probably good enough).
What do the experts recommend?
Thanks & Clear Skies,