Sun Funnel and Eyepiece Damage
Posted 05 May 2012 - 06:38 PM
Posted 05 May 2012 - 09:10 PM
This was common knowledge in the past when solar projection was the norm. Will today's modern eyepieces with advanced optical adhesives be up to the task of solar projection? I wouldn't want to take that chance!
Posted 05 May 2012 - 11:04 PM
Posted 06 May 2012 - 10:22 AM
Posted 06 May 2012 - 02:43 PM
A solar film objective filter is cheap, safe and gives a far better view in my experience.
Posted 06 May 2012 - 07:53 PM
Posted 07 May 2012 - 02:48 PM
I also have a solar filter for my 50mm scope, and while the image is great, I am expecting a group to come by and I think with the projection more people can observe the eclipse at the same time rather than standing in line to look through the other telescope.
Posted 24 April 2013 - 11:13 PM
Orthos have two cemented gaps. Plossls have two cemented gaps. Kellners have one cemented gap. Same with RKEs. TMB Supermonos have two cemented gaps, etc., etc.
Only a singlet or air spaced doublet eyepiece will lack any cemented gaps. Not very common these days.