Series Filter numbers to metric equivalent

spoolman · May 2, 2010

Is there a reference list anywhere that shows Series Filter Numbers(such as Series VI) and the metric equivalent.

Thanks,

Doug

munz6869 · May 2, 2010

Is that possible? The series VI filters I have (amassed!!) for my mini Crown Graphic have no thread - the just "sit" in a holder, which is sometimes a push on ring on a push on lens hood, or a step-up/down ring from a metric size (49mm to series VI, for example).

Marc!

Bob-D659 · May 2, 2010

There is a table here http://en.wikipedia.org/wiki/Photographic_filter that gives the diameters of the series filters, if that's what you are looking for.
.

Christopher Walrath · May 2, 2010

As said, not threaded, just inserts. But great filters. I use them with my Ektar 127mm and they perform great.

Q.G. · May 2, 2010

munz6869 said:
Is that possible? The series VI filters I have (amassed!!) for my mini Crown Graphic have no thread - the just "sit" in a holder, which is sometimes a push on ring on a push on lens hood, or a step-up/down ring from a metric size (49mm to series VI, for example).

Marc!

Series filters were supposed to be held in place by a threaded retaining ring, screwed into the Series filter holder - usually a fixed part of the lens) that also had a Series size designation.
So it would be possible, yes.

But the thread pitch of Series filter retaining rings isn't the same as in metric filters. So even though, say, Series VIII is 67 mm wide, metric 67 mm filters will not fit properly.

ic-racer · May 2, 2010

Actually the ring that holds the 'series' filter in place has a measured size. For example series V is like 32mm and series VI is like 44mm. This is important with Bolex equipment because the front lens threads have the 'series' thread sizes. The way it works is that the threaded lenshoods hold the series filters in place in the front of the lens. Filter and adapter manufacturers tend to skip those series size threads, so I had to have SK Grimes make screw on adapters for my Bolex lenses so I can use more common filter/accessory sizes like 49mm and 35mm. I had them make 44mm->49mm and 32mm->35mm adapters.

Q.G. · May 2, 2010

Greg Davis said:
This store lists it, but just in case you don't visit it:

[...]

Thanks!

Important to note is that the dimensions given are those of the filter, not of the holder/retaining ring, which obviously are a little bit bigger.

P.S.
Noticed you mentioned that too in your later post. Sorry!

r-brian · May 3, 2010

I have a Series VIII holder that's held on with 3 set screws. My 67mm filters screw onto the holder just fine. I use this holder on all my LF lenses without any problems.

John Koehrer · May 3, 2010

r-brian said:
I have a Series VIII holder that's held on with 3 set screws. My 67mm filters screw onto the holder just fine. I use this holder on all my LF lenses without any problems.

This one comes up every once & again. You may find some differing opinions from the peanut gallery.( I've done the same as you)

Q.G. · May 4, 2010

Greg Davis said:
Series VIII retaining rings are close enough to 67mm that you can interchange them.

Yes.
Or not, depending on manufacturing tolerances and how they 'match'.

Series Filter numbers to metric equivalent

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