I could google it and spend some time researching, but thought I would tap the combined thousands of years of knowledge in the forum (wel...perhaps hundreds...) basically I'm looking at some filters for CCD photos.
Some are recommend where 'you have a system without any refracting elements', others don't mention that.
Does this mean that some are better for refractors and others can be used in scopes like SCTs? Or have I got the wrong end of the stick there.
Thanks for reading.
Simon.