Oh that was smart...looking with a magnifier..... glad you solved the fogging problem. I'll keep this in mind incase I have a "fogging" appearance again.no filter. i looked at the inside (round) lense with a magnifier and found that it looked segmented (cracked or scored) which didn't make sense as case and lense cover not cracked. Perhaps some temperature change effect on the lense coating, which caused very blurred picture. Anyway, replaced the lense and picture is fine