Disastrous Consequences (solved: fog with Intrepid lensboard)

[Duolab123]

I have the same lens, the board needs to be cut to fit the shutter. There's a fellow in Chicago that makes marvelous lens boards for cheap. He's on Ebay. The shutter needs to be fully engaged and the shutter mounting nut should also fit into the lens board hole. Buy a flat metal shutter wrench to tighten the nut down.after all that's in place screw in the rear element.
If you found the shutter loose I would suspect that's where your light strike came from.

[Jody_S]

Assuming you only pull the dark slide just before taking a shot, and put it back in immediately after, that's a big light leak that should be quite easy to find by doing a light test. Nodda Duma says some of their lens boards aren't fully opaque, that would explain a really diffuse light leak like this one.

[Kiwi7475]

See here:


https://www.largeformatphotography.i...question/page2

[Dugan]

Fun detective work!
Now that you know how to seat the lens and retaining ring (it's not a "nut") properly...take the lens & shutter assembly off of the lens board, and paint the back side of the lens board with flat black paint....a couple coats.
Let it dry, and reinstall the lens & shutter assembly.
....and Voila!

[brianentz]

Unbelievably, the lens board appears to be the problem. It is a genuine Intrepid lensboard and it isn't lightproof. I put a flashlight up against the lensboard and it just shines through.
It sure looked light proof. I'm aghast. I will let Intrepid know about this.

[brianentz]

Not "appears" to be the problem - IS the problem. I read the comments but couldn't believe that it could actually be anything other than light proof.

[Kiwi7475]

If you read the thread I posted you’ll see they’re aware and solved it by going from FR4 to Aluminum.

I’ve done my fair share of PCBs in my early days and know quite well FR4 is not light proof....

But yes, contact them and I’m sure they’ll send you a replacement in aluminum.

[brianentz]

Yes, I read those notes, but after earlier comment. I'm sure they'll send me a new one. Still - amazing that could happen. Well, problem solved, I guess.

[md-photo]

Translucent board?? How does something like that go into production without testing?

[John Layton]

speechless...