They last a lot better in the lab or studio than in the field. But ya still gotta be careful. Keep around some alcohol wipes for your fingers. And some colors are more susceptible to fading than others, which is one reason I never buy used or even old gels unless I'm certain of their storage conditions. The old Kodak Wratten handbook is excellent, with all its spectrograms, transmission characteristic, fade rating, etc.
Horsemen Camera offered a behind the lens mount
I once got a DIY Horseman glue up emulation
Never tried it, seemed a poor idea
Tin Can
The Horseman BTL filter holder looks like this:
The filter holder can be detached, but it is too large to fit a camera that takes Linhof Technika boards.
Kumar
Kumar, that's quite an apparatus, a testament to the extensive thoughtfulness that went into professional design in an economy that valued industrial quality and innovation.
Philip Ulanowsky
Sine scientia ars nihil est. (Without science/knowledge, art is nothing.)
www.imagesinsilver.art
https://www.flickr.com/photos/156933346@N07/
I'm sure a lot of people will frown on this idea but ... in my early days of commercial photography we almost always used CC wratten filters behind the lens. We simply rolled a piece of black/photo masking tape backwards along the rear lens edge. This made a sticky place for the very lightweight wratten filter to attach itself to.
Yep- There's nothing like trying to get old masking tape and its residue off of equipment. The labs and studios used miles of it. That horrible custom only ended when duct tape got popular instead - even worse.
Lee Gelsnap Filter Holder will fit on rear
https://www.leefilters.com/index.php...-filter-holder
Tin Can
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