Canon LTM Strange filter nomenclature?

Canon M39 M39 screw mount bodies/lenses
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Lann

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Hey forumites,
I'm looking for filters that'll work on a 50mm f/1.4 that I've ordered. I came across a deep yellow stamped "Canon Japan 48mm Y3 2X"
I know there are Y2 and Y1 filters but can't find info on Y3s... Anyone ever heard of or used one? Should I buy it as a rarity?
Thanks, ya'all!
 
I imagine that Y3 is a very strong yellow. The 2X refers to the exposure compensation. Probably is a bit rare, maybe something a Canon collector would want.

Jim B.
 
From the Canon System Equipment catalog in about 1968, the B&W filters offered were: UV 0x, Y1 1.5x, Y3 2x, G1 3x, O1 3x and R1 6x. The color filters were: 1A Skylight 0x, 80B, 80C, 81A, 82A, 85, and 85B; users were referred to the film instructions to find the film speeds with the color correction filters.
 
Lann said:
Well that right there's a sparkly golden nugget of info! And why does 2x mean one stop, not two?
Click to expand...

Because it means twice (2x) the exposure..... not +2 stops. (BTW I have this filter for my Canon 50 1.4 LTM and it's a great B/W filter and very thin.)
 
Deardorff38 said:
Because it means twice (2x) the exposure..... not +2 stops. (BTW I have this filter for my Canon 50 1.4 LTM and it's a great B/W filter and very thin.)
Click to expand...

Of course - twice because the stop scale is geometric, not arithmetic; sq. root of 2, etc., which I should've remembered (from my youth when 'the world was in black + white' as my son is fond of telling me...)
Delighted to hear you have one and it's performing well on the same lens Deardorff38, thank you - glad I ordered one now ;)
 
More filter-related questions...

More filter-related questions...

Hi All,
Can anyone tell me if I'm correct in thinking the Canon CCA (Colour Correction Amber?) filter is an 85b equivalent? I've seen CCA4 1.5x filters and a CCA8...
Many thanks! Lann
 
Lann said:
Hey forumites,
I'm looking for filters that'll work on a 50mm f/1.4 that I've ordered. I came across a deep yellow stamped "Canon Japan 48mm Y3 2X"
I know there are Y2 and Y1 filters but can't find info on Y3s... Anyone ever heard of or used one? Should I buy it as a rarity?
Thanks, ya'all!
Click to expand...


The Japanese Y series filters are generally similar to the old Wratten system K series. Both series have 3 variants, each progressively "stronger". Actually, that are all band pass filters and not tinted filters. Their cut-off frequency and the slope of the curve vary. "Stronger" applies to their visual appearance and the effect they have.
 
Lann said:
Hey forumites,
I'm looking for filters that'll work on a 50mm f/1.4 that I've ordered. I came across a deep yellow stamped "Canon Japan 48mm Y3 2X"
I know there are Y2 and Y1 filters but can't find info on Y3s... Anyone ever heard of or used one? Should I buy it as a rarity?
Thanks, ya'all!
Click to expand...

Maybe a K12 (K8 is typical Med Y: 2x, K15 is deep Y: 3-4x, K12 is in-between, still 2x?).
 
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