even 43 is too big… 😉
Bingley
Mentor
I purchased 34mm UV and yellow filters from B&H in NYC. Looking for a red filter now, but those are pretty rare even in more common sizes.
Deardorff38
Mentor
34mm Hanimex R1 RED Contrast Filter - Classic Style - NEW 18208022373 | eBay
Find many great new & used options and get the best deals for 34mm Hanimex R1 RED Contrast Filter - Classic Style - NEW at the best online prices at eBay! Free shipping for many products!
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34mm Panagor R (25A) RED Contrast Filter - Classic Style - PERFECT LN 18208022373 | eBay
Find many great new & used options and get the best deals for 34mm Panagor R (25A) RED Contrast Filter - Classic Style - PERFECT LN at the best online prices at eBay! Free shipping for many products!
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Leica Black Rim R.H. Deep Red E34 Filter for 5cm f2 Summar with Case | eBay
For sale is a nice condition Leica Black Rim R.H. Deep Red E34 Filter for 5cm f2 Summar with Case. The filter has a small mark on it, but is otherwise clear of haze, fungus, or scratches.
www.ebay.com
....or Heliopan from B&H 4-6 weeks special order.
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I use vintage filters on vintage glass but for more modern or higher-end lenses I prefer modern multicoated filters.
Many of those are B+W and Heliopan, but no one stocks the Heliopan range in 34.
B+W doesn't make anything in 34mm...
Heliopan has single-coated red if you don't mind waiting 8-10 weeks...but it looks like all their black and white filters are single coated.
B&H has Heliopan light red listed at 4-6 weeks
Many of those are B+W and Heliopan, but no one stocks the Heliopan range in 34.
B+W doesn't make anything in 34mm...
Heliopan has single-coated red if you don't mind waiting 8-10 weeks...but it looks like all their black and white filters are single coated.
B&H has Heliopan light red listed at 4-6 weeks
cboy
Well-known
Either 34-39 / 49 stepup with a tiffen 39mm glimmer glass filter to take off the edge when using a digital m😉.
Close to perfect setup for me, except the free floating distance ring that changes every time I change aperture, which is really annoying...
Close to perfect setup for me, except the free floating distance ring that changes every time I change aperture, which is really annoying...
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Yes that is a little irritating but I think it won't take long before it isn't bothersome. 
Acceptable trade-off, since the lens is so tiny and light...
Acceptable trade-off, since the lens is so tiny and light...
Godfrey
somewhat colored
It's really shame to me that this lens does not have a 39mm filter ring, which is standard for a huge number of Leica M-mount lenses, particularly as most of the other "classic" themed Voigtländer lenses do too. That additional 2.5mm radius on the front-most ring of the lens would not have changed its looks or handling in any substantive way.
The lack of a 39mm filter ring basically makes the lens impractical for me. Yeah, I could get a 34->39 step up ring, but then what do I do about a lens hood? Dumb.
G
The lack of a 39mm filter ring basically makes the lens impractical for me. Yeah, I could get a 34->39 step up ring, but then what do I do about a lens hood? Dumb.
G
Reviews indicate it doesn't appear to need a hood: Voigtlander 40mm f/2.8 Heliar VM Review
Deardorff38
Mentor
Godfrey, the style does pre-date the 39mm filter. The 35/50mm Elmars both used A36 filters....which incidentally fit the 40mm Heliar. No one knows why lens designers make some decisions. Having used the heliar all last summer in the mountains, the lack of a substantial lenshood really has no effect. As far as filters, in my opinion it's a minor inconvenience. We choose the lens and we buy into the filter system...or not.
In some ways it's remarkable that anyone still produces lenses like these in the 21st century. The Voigtlander 40mm is tiny & sharp. We are lucky to have such a large range of choices.
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Voigtlander likes doing retro designs which is why they probably went with the A36 front, which means they had to go with something smaller (34mm in this case) for threaded filters.
I'll pick up a 34mm UV for color and use the step ring to 40.5 for b&w filters since I have several that size already.
This lens will replace my 50/3.5 Elmar, which interestingly weighs more than the 40 (!) and is far more cumbersome when it comes to filters and shades and aperture changes.
I'll pick up a 34mm UV for color and use the step ring to 40.5 for b&w filters since I have several that size already.
This lens will replace my 50/3.5 Elmar, which interestingly weighs more than the 40 (!) and is far more cumbersome when it comes to filters and shades and aperture changes.
Deardorff38
Mentor
Well the 50 Elmar has the extendable barrel...that should account for the weight differenceVoigtlander likes doing retro designs which is why they probably went with the A36 front, which means they had to go with something smaller (34mm in this case) for threaded filters.
I'll pick up a 34mm UV for color and use the step ring to 40.5 for b&w filters since I have several that size already.
This lens will replace my 50/3.5 Elmar, which interestingly weighs more than the 40 (!) and is far more cumbersome when it comes to filters and shades and aperture changes.
Godfrey
somewhat colored
I don't disagree, but it is annoying when they have produced so many nice lenses with 39mm filters (like all the Color-Skopar 21, 25, 28, 35, and 50 mm lenses, for instance) that they would choose a different filter size for this one, which fits in the same retro-pseudo-repro class ... and a filter size that is quite difficult to find as well. This is not a true reproduction of an earlier lens trying to be faithful to type: they could have chosen anything for its filter requirement.
As it is right now, I have relatively complete filter sets for 37, 39, 40.5, 46, 49, 52, 60, Series VII, and 77 mm. I have at least three lenses each that take those sizes. One of this lens will require at least two additional 36mm filters for my average use, that nothing else in my lens kit uses.
It's just a personal annoyance. I think the lens is delightful, although I'll likely not buy one and this is one of the reasons why not.
G
Deardorff38
Mentor
A quick calculation suggests that with 27+ lenses, you won't miss this one
I’m ok with the choice of 34 as I’d rather keep the diminutive dimensions than go with 39.
A step ring to 40.5 solves everything for me.
A step ring to 40.5 solves everything for me.
The weight is actually identical. 😀 I measured 110g for the Elmar and 108g for the 40mm.
Godfrey
somewhat colored
There is that... !!A quick calculation suggests that with 27+ lenses, you won't miss this one
But I have a lot of cameras, too. Four with M-mount... G
hap
Well-known
Nice CL. I already have a 40mm (summicron C) and have cold feet for the Heliar.
Bingley
Mentor
34mm Hanimex R1 RED Contrast Filter - Classic Style - NEW 18208022373 | eBay
Find many great new & used options and get the best deals for 34mm Hanimex R1 RED Contrast Filter - Classic Style - NEW at the best online prices at eBay! Free shipping for many products!www.ebay.com
34mm Panagor R (25A) RED Contrast Filter - Classic Style - PERFECT LN 18208022373 | eBay
Find many great new & used options and get the best deals for 34mm Panagor R (25A) RED Contrast Filter - Classic Style - PERFECT LN at the best online prices at eBay! Free shipping for many products!www.ebay.com
Leica Black Rim R.H. Deep Red E34 Filter for 5cm f2 Summar with Case | eBay
For sale is a nice condition Leica Black Rim R.H. Deep Red E34 Filter for 5cm f2 Summar with Case. The filter has a small mark on it, but is otherwise clear of haze, fungus, or scratches.www.ebay.com
....or Heliopan from B&H 4-6 weeks special order.
Thanks! I’ll look at ebay again… I checked it a few weeks ago and didn’t see any red filters in a 34mm size.
AveryWagg
Established
I use a step-up ring (34 to 39mm), for black & white, and use an old Crown 34mm UVA that a local camera store happened to have in it's 'old stock' bin. I had never heard of a Crown branded filter before, but it seems fine. The filter box was so scruffy and battered that the owner just gave it to me..