Hi Folks,
Question regarding mirror cooling times - apologies if already covered thoroughly (having issues with search function, gives blank page?) -
Recently picked up an old russian Mak-Cass to be used specifically as a camera lens - MTO-11CA 10/1000 - (
http://www.rugift.com/photocameras/m..._canon_eos.htm)
Had good results on first use -
http://vimeo.com/66691779 - but now having issues getting crisp focus, and am wondering if it's due to not letting it cool down enough.
Based in Brisbane (outside temperature probably 12-15° or so at night), and it's currently stored in an unconditioned room which pretty much always has a window open. Would've thought 30mins should be enough?
Or, would another option be to build a resistor based dew-heater (have built a few for smaller diameter camera lenses) & wrap around the mirror area, in the hope of eliminating thermal differentials by just bringing it up to a higher constant?
Thanks!