How could it be possible?

I used a cheap 49mm filter with the glass removed and screwed its rim to the lens of my DA 15mm to make an extension to fit a circular polariser as helpfully suggested by a forum member. It worked fine and was able to extend the hood as well as fitting the cap.

Used it yesterday and found to my annoyance and frustration that I was unable to unscrew the glassless filter from my lens. It was not screwed on tightly!

I could leave it on permanently but would rather not!

Help, please!

Try pinching it gently on one side only between finger and thumb then turn it, I had exactly the same problem with my 43mm 1.9

Could try a ring of blue tack around filter, stick it to kitchen worktop and unscrew lens off filter?

Marigold gloved hand placed flat accross the filter! Pink or yellow glove either is fine....

Squeezing the filter too hard will deform it and that makes it much more difficult to remove. The Marigold idea is sound. There are also special filter removal grips that hold the pressure equally all round the rim.

Push the filter gently onto/into the sole of a shoe, then maintaining pressure, unscrew the lens from the filter.

You could also try a rubber band around the filter to give some traction.

You need to take a more technical approach to this problem with an understanding of the physics of friction which is the underlying issue.

Grip the camera tightly in a vice, take a hammer to the glass, smash it, and you will find it easier to tear the rim off with a pair of pliers. If that doesn't work, heat up the rim with a blow torch and the rim is simply removed with an oil filter chain wrench. Job done!

Real men don't wear Marigold gloves



(only joking)

Andy

Warmest thanks, gentlemen for your advice and suggestions. Will try one by one (including ronniemac's) until sorted! 😆😎

Have just remembered, I have used those jam-jar lid openers (gently) and that has always worked as they effectively grip in four places equally around the filter
Andy

Once you get it off (I like ronniemac solution and before you put it back on again take a hack saw, preferably a junior one and carefully saw through (at one location only ) and clean up the cut with a needle file.

The next time you screw in on you should be able to squeeze it off relatively easy.

The real problem is that the two threads are either:

metal to metal without any lubrication - such as oil, grease or graphite and will often cause problems. Any lubrication can easily seem onto the glass which is not wanted

or, paint to paint and the dimensions of those are not tightly controlled and any rubbing can cause the paint to move and cause a small lump which will jam or the surfaces to adhere to each other.


The only real way of alleviating the problem would be to make a series of say 4 small holes around the circumference of every filter, then insert the end of a cocktail stick in opposite holes and twist.

As previously suggested, a jar opener will do it, it'll scratch the filter on the outside though.

The first solution from Michael did the trick. The weird thing was I hardly applied any force to unscrew it.

Any physicist out there might explain it?!

Thanks again!