I have recently purchased a new Schneider 110mm XL lens. I am really nervous abo ut leaving the glass exposed and am tempted to put filters on both the front and back. I plan to use high quality B+W filters. Firstly, will this degrade the im age to a noticeable extent? I may want to stack another filter on the front, say a yellow or red. Will having three additional pieces of glass (albiet good ones ) affect the image quality enough to worry me?
Secondly, does anyone know if the rear element has the same problem as the front element, in terms of the filter touching the glass? Also can anyone confirm tha t the rear element has a 52mm thread? - I am not confident to measure it myself.
Bob Salomon in another thread says that putting a filter on the back element cau ses focus shifts and image degradation if anything is on the filter. How big a p roblem is this? Would it be a problem with a high quality filter like B+W?
If anyone has tried this could they please let me know how it went?
Many thanks for your help!
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