9.5" Velostigmat II SF lens in shutter or barrel? I need measurements.

[David Aimone]

Darren, is yours a series II or other? Just checking, as it says series III on your profile...

[Darren Kruger]

Darren, is yours a series II or other? Just checking, as it says series III on your profile...

The measurements I gave above are from my Velostigmat Series II 9.5" f/4.5 lens. I own several other Wollensak Velostigmat lenses of various flavors. The III is one I have used on my 8x10 though it has been a bit.

-Darren

[Darren Kruger]

Is there any way you can give me distances from the front and rear to the aperture blades? And/or the thickness of the front adapter alone? Although I probably have enough information if yours is on a Betax 4 as well!

I don't have anything to measure to the aperture but it should be standard for the Betax #4. I just noticed that my shutter just says Betax appears to be the same size as my other Betax #4 shutters.

I'll go to my local camera shop tomorrow and see if the tech there can remove the front adapter.

Do you have a good side picture of the rear element showing the threads? Mine looks like it has an adapter/extender but it might be part of the construction and might be present on yours.

-Darren

[David Aimone]

Thank, Darren. This is probably enough information to know that we're comparing apples to apples (same version lens, same shutter).

I'll try to get a good photo from the side of the rear element later today.

I appreciate your research. This will probably enable me to get this lens set up properly.

David

[David Aimone]

Side views.

Here's a view of the rear element and a Betax 4 shutter (the lens piece mounted on the front is not part of the 9.5" Velo II):



And here is the front element alone:

[Darren Kruger]

Side views.

Here's a view of the rear element and a Betax 4 shutter (the lens piece mounted on the front is not part of the 9.5" Velo II):

The rear element looks a lot like mine in regards to the spacer so i think you are good there. Do you have a side picture of the original shutter? I'm wondering if the adapter is still on there. Does the front element screw in the original shutter?

-Darren

[David Aimone]

I'm 95% sure that there is no front adapter on the old shutter. I believe the front is the same as my other Betax 4 shutters with nothing on them. But I will verify tonight when I'm home.

The front element DOES screw into the original shutter (which has no internal mechanism). But without an extension, the rear of it protrudes into the shutter blades (on my other intact Betax 4 shutters that have them).

So if the rear element is the same and goes right on the back, then it looks like I'll just need a front adapter to space the lens correctly.

The rear element looks a lot like mine in regards to the spacer so i think you are good there. Do you have a side picture of the original shutter? I'm wondering if the adapter is still on there. Does the front element screw in the original shutter?

-Darren

[David Aimone]

Confirmed: no front adapter on the old shutter.

[David Aimone]

Thanks everyone, especially Darren. I have scientifically determined with great accuracy that I need an extension adapter to separate the front lens barrel from the Betax 4 shutter by 6.5mm

[David Aimone]

SK Grimes is crafting the extension as we speak. Should end up with a very nice little SF lens for cheap.