Topic: What thickness of foam for Pentax 6x7 prism?

[Harvey]

I'm looking to replace the foam on my Pentax 6x7 prism and chimney finders. Can anyone advise what thickness of foam I need please? Curent remains offer no clue!
Thanks

Shaun

[Aksel]

I am doing that job on my camera now with 3mm foam and I cut it to avout 7mm wide.
Not sure if it´s the correct thickness but we shall see     
I`ll keep you posted with the results.


Aksel

[Harvey]

Great timing Aksel! I shall await your results. Much apprecited.

Shaun

[tkmedia]

Unfamilar with 67 design in re to finder, but is foam the best option? I been using dark string in many cameras with better results and seems to wear better.

[Aksel]

Pentax uses foam originally, that´s why I oped for it. Also super easy to cut and stick on when you get foam with glue on on side.
Bees bussy bussy doing nothing the last week but I shall get to it sometime during this week. 

[Harvey]

Well I've cured the rattle. I went with 2mm closed cell foam and it's a nice snug fit.

[Aksel]

Sorry!!!!
Been to busy to get my 67 prisms fixed. Glad to hear the 2mm worked out well, hope my 3mm will be usable.

[Harvey]

Sorry!!!!
Been to busy to get my 67 prisms fixed. Glad to hear the 2mm worked out well, hope my 3mm will be usable.

No drama Aksel, I'm just impatient!
I went for 2mm closed cell as I reckoned it was equivalent to 3mm open cell which I guess is what you're using? I find closed cell easier to work with, a bit more forgiving.

Shaun

[Aksel]

That´s a correct assumption, the foam I´m usingg is the soft open cell type typically used as light seals around the film door / mirror damper etc.