Voigtlander Ultron filters

Can anyone help with information regarding the filter size for the

Ultron 1:2 / 50 lens mounted on the Voigtlander Prominent 1?

 

My dealer and I spent time carefully measuring, and a generic

lenscap fits, both of which indicate 46mm. So I ordered a 46 mm

Hoya filter which sits on the filter ring, but refuses to screw in.

 

Is this another quirky Voigtlander accessory design such that

only the Voigtlander made filters fit?

 

many thanks - Ross

This is just a guess but I had a similar problem once with trying to screw a Leica (M) 43mm UV onto "industry standard threads" of my non-Leica camera (which had a fixed Leica lens on it). It wouldn't screw on because the Leica filter's threads had a different pitch than the threads on the camera. So I went with a Heliopan instead.

I believe the Ultron & Nokton have 45mm filter threads, but have never seen 45mm screw-in filters from Voigtlander (or anyone else). The "official" Voigtlander filters & accessories I have are all 47mm slip-ons.

Some camera makers used those odd-ball thread pitches. So even if the millimeter is correct, it still won't screw in.

 

Someone on the Leica board was saying the 40mm Summicron for the CL/CLE uses a 39mm thread but a different pitch. So the filters that normally fit most Leica lenses won't thread onto this particular lens.

 

I don't know if this is the case here.

All my classic Voigtlander filters are slip-on filters. The threads are probably for something like the retaining ring that holds the front element of the lens in place.

I have screw on filters and lens hoods for my Prominent, but am not sure of the size. I am pretty sure that they fit all the Prominent lenses, 50mm Ultron and Nocton, plus 35 mm and 100 mm. Not easy to come by.

Many thanks for the help.

 

The Voigtlander lens hood for this camera is marked 310/47

which must be the outside diameter; the push on filter concept

correlates with that; the Voigtlander quirkiness comes through

yet again: I'm still amused or bemused by the way the 'backward'

loading of the film into the Vitessa flips the frames around,

compared to most (or is it all?) other cameras which advance left

to right, not the other way round. At least I can always positively

identify negs shot on the Vitessa.

 

thanks - Ross