OK Here is a question for the optics people. I am involved in a refractor project that requires a long focal length objective. I've come across a Jaegars 3.2" air spaced achromat objective that has a 48" focal length (f/15). The scope is primarily intended for planetary and double star viewing. However, the optics are not coated. I've read that older Jaegar optics are quality. Should I be concerned about the lack of coating? Light transmission is not an issue for the intended use. However, I worry about ghost images.
optics question
Started by rferrieri, 12/10/2002 06:00PM
Posted 12/10/2002 06:00PM
Opening Post
Posted 12/10/2002 07:02PM
#1
In my experience ghost images are more apparent with uncoated eyepieces than uncoated objectives. I have an uncoated 60mm for a 'quick look' and I've never noted any ghosting. While at 3" you are definitely on a "light budget" and want as much transmission as possible, if it's a Jaegers and a good enough deal maybe it doesn't matter to you.
Funding Member
