Hi there this is my first post so do not know if I have done this correctly.
I am digiscoping using a Pentax K-20, with a Swarovski HD spotting scope 60mm 20 to 60x Zoom eyepiece I am using a lens that the f stop only goes down to 5.6. so that I am having to use an ISO around 800 which seems too grainy with slow shutter speeds for optimal pictures? I have read that I should be using a Pancake Pentax 40mm/f2.8 lens. This is an older style lens - is this still a good option - are there better options? Any advise would be most appreciated.