mark_stephan2 Posted January 6, 2019 Share Posted January 6, 2019 Purchased a used first version of the Canon 100-400 IS lens and it included a large 77mm filter which I can't seem to remove. The filter is 7.5mm in thickness and it's marked B+W, 77E and KR15. What does this tell me about the filter? I think it's very old, it's silver in color and the glass is beautiful. I know what B+W is because I use B+W filters but the rest of it I can't figure out. Thought some of you might be able to enlighten me. TIA, Mark Link to comment Share on other sites More sharing options...
Dieter Schaefer Posted January 6, 2019 Share Posted January 6, 2019 (edited) 77E 77mm diameter, E stands for "single coating"; MRC would indicate "multi resistant coating". KR15, also known as 85B: (yellow-orange) color conversion filter, used with tungsten film when shot in daylight to eliminate blue cast: B+W72mm KR-15 85B Color Conversion Glass Filter Extra-Wide Almost certain it says KR1.5 though - which would be a skylight filter (1A, slightly warming colors) Here's a link to a B+W filter brochure: https://www.schneideroptics.com/pdfs/filters/bw_filter_programm_e.pdf Edited January 6, 2019 by Dieter Schaefer Link to comment Share on other sites More sharing options...
Tony Parsons Posted January 6, 2019 Share Posted January 6, 2019 If you can't shift the filter then (assuming you are right-handed - if not, reverse suggestions) put a rubber washing-up glove on your left hand, hold the lens by a non-rotating portion, then press the filter gently but firmly against the rubber-covered palm of your hand and attempt to unscrew it. Should give just enough grip - or else shred the glove ! YMMV Link to comment Share on other sites More sharing options...
JDMvW Posted January 6, 2019 Share Posted January 6, 2019 Also, banks and such-like outfits often give away flat rubber lid removers. You can also try to turn the rubber and filter by pressing the palm down on the rubber and twisting in the proper direction... Squeezing on the sides may distort the filter ring and make it harder to turn. 1 Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted January 6, 2019 Share Posted January 6, 2019 Try rubbing an ice cube around the filter, avoiding the lens body. Or sit the filter on one of those frozen gel packs for cooler-boxes. It worked for me when I had a 77mm filter stuck firm to 100-300 zoom. When you get the filter unstuck, rub candle wax into the thread and it won't stick so easily. Link to comment Share on other sites More sharing options...
Tony Parsons Posted January 6, 2019 Share Posted January 6, 2019 Heard the candle wax trick - I prefer to use graphite from a soft pencil lead. Easier to control, and has an excellent applicator - the pencil. 1 Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted January 7, 2019 Share Posted January 7, 2019 Heard the candle wax trick - I prefer to use graphite from a soft pencil lead. Easier to control, and has an excellent applicator - the pencil. - The issue with graphite rubbed from a pencil is that is that powder tends to get on the lens or filter, and its adhesion isn't good. Wax, OTOH, sticks in the threads, and also has a built in applicator - a candle. Candle wax rubbed on a saw blade makes cutting wood a lot easier too. Link to comment Share on other sites More sharing options...
peter_fowler Posted January 8, 2019 Share Posted January 8, 2019 Haven't tried any of those , but , being a m/c mechanic I tend to use a trace of anti-seize compound on sticking filters. Peter Link to comment Share on other sites More sharing options...
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