last quetion about filters for Summicron 40mm

[Assaf]

This is the last question, promise 🙂

I found in a local store a 39mm B+W UV MRC filter. I noticed that the diameter is right but the screw thread of the filter is not the same as in the lens.

The B+W "step" or whatever it's called is 0.5 which is narrower than the one on the lens.

Then I figured out that all the 39mm filters and hoods I have are the same as the B+W filter. However, the lens itself and the original rubber hood have a different (and matching) thread.

Are all 39mm filters with the "narrower" thread? According to B+W catalog, there's only one 39mm connection called 39/0.5. What about Heliopan?
They screw in and hold, but don't go all the way.

What is the common choice for a filter size for the 40 cron?

I know the original idea was to put a small filter (with no thread) between the hood and the lens. But do they make such MRC ones?

Thanks for your answers
Assaf

 

[sleepyhead]

Hi Assaf, the 40mm Summicron-C takes series 5.5 filters which are held in place by either a retaining ring (sometimes covered in rubber), or by the collapsible rubber lans shade which screws onto the lens.

---Yaron

 

[Assaf]

Hi Yaron, how are you?
I know about the 5.5 filters and also have two of them the rubber hood and another ring with no rubber. As I understood you can't get new 5.5 filters in in MRC, and "most of the world" uses 39mm filters for this lens.

I just want to make sure that the ones who use the 39mm filters actually use the "wrong thread" (and can't install the filter all the way)

 

[Al Kaplan]

The "Series 5.5" are next to impossible to find. Minolta, when they marketed their version of the CL supplied the 40mm and 90mm Rokkor lenses with a much easier to find 40.5mm filter thread. Supposedly the 40 is the exact same formula as the Summicron and it's a known fact that Leitz in Germany made the 90mm Rokkor-C. It's an Elmar-C with a different name in front and the more common 40.5mm filter size.

My "solution" is to use a standard 39mm filter if I need a specialized filter on occasion, such as an 80-C or 82-B for color, but to otherwise "go bare". So far I've got a 30+ year old heavily used lens that still takes great photos. Years ago I removed the tattered remains of rubber from the metal ring of the original hood. It's just the right size to squeeze up into a standard series VI metal hood, and it's secured with a drop or two of epoxy. Of course the hood won't fit on a standard 39mm filter, but life ain't perfect.

 

[bern_fischer]

AFAIR the threading of the Summicron-C is the uncommon M39 x 0.75 instead of the normal M39 x 0.5.
Greetings
Bernhard

 

[Assaf]

AFAIR the threading of the Summicron-C is the uncommon M39 x 0.75 instead of the normal M39 x 0.5.
Greetings
Bernhard

Bernhard, I think you're right.
So, does it mean that M39 x 0.75 are impossible to find?

 

[wontonny]

Hi Yaron, how are you?
I just want to make sure that the ones who use the 39mm filters actually use the "wrong thread" (and can't install the filter all the way)

Nope. I have a B+W UV filter and it doesn't screw on all the way. there is a small gap between the thread mount and the filter.



As an aside, does anyone have any experience with the 39mm B+W rubber collapsible hood? Does it work the same as the original that came with the lens?

 

[delft]

[...]So, does it mean that M39 x 0.75 are impossible to find?

The heliopan website does mention 39x0.75mm filters in the pricelist for colour filters and UV filters:
http://www.heliopan.de/Preisliste.pdf

Good luck,
Dirk

 

[Monz]

I use the 39mm B+W filter on the 40mm summicron-C. As mentioned, it doesn't tighten all the way but just enough to make it useable. It hasn't dropped off yet!