This applies to using ultrawide lens such as Super Angulons or Super Symmar XL lenses. Many of them need a large diameter center filter so adding a filter to the front of the lens is problematic. Then there is an option of adding filters to the back of the lens, in fact al the SSXLs have threads for this. But I remember reading about problems of using filters this way (don't remember what problems). However, I do not understand why would there be any problems. Anyone can enlighten me on this?
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