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Old 25th September 2022, 09:51 AM
Nat Polton Nat Polton is offline
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Default Ready Made Pinhole

I was cleaning out an empty coffee bean tin and noticed a tiny hole in the base. I think this hole is used to form a Vacuum, then sealed with a plastic adhesive square.
Any pin hole enthusiasts that use tinned coffee beans should inspect their pantry stock. I remember seeing a similar hole in a tin of powdered Chinese soup base.
The hole is smooth both sides, and I wonder if it is pierced with a laser for ease of production.

http://www.film-and-darkroom-user.or...1&d=1664099352


http://www.film-and-darkroom-user.or...1&d=1664099352

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A pair if old scissors and cutters should liberate the pin hole from the tin.

Cheers.
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Old 25th September 2022, 10:54 AM
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Reginald S Reginald S is offline
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Quote:
Originally Posted by Nat Polton View Post
I think this hole is used to form a Vacuum
I think this hole is used as a sniffhole, avoiding the bean tin becoming a bomb.
Fresh beans are outgasing CO2 for some weeks.
Unfortunately to me this Illy stuff hasn' had a fresh taste.
That's why I prefer small roasting shops.


""A pair if old scissors and cutters should liberate the pin hole from the tin.""

Why not simply using the complete bean tin as a lens barrel?
It's rear has a thread so only a kind of flange is needed :-)
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Old 25th September 2022, 01:11 PM
Terry S Terry S is offline
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Quote:
Originally Posted by Reginald S View Post
""A pair if old scissors and cutters should liberate the pin hole from the tin.""

Why not simply using the complete bean tin as a lens barrel?
It's rear has a thread so only a kind of flange is needed :-)
Well spotted Nat! I'll be checking my coffee packets I have now, as well, as I'm sure I've seen these holes in them. I never thought to look at my coffee tins or to even make the connection before. The tins could become a ready made pinhole camera for circular prints!

My next purchase of coffee, I'll be checking the bottom of the tins, as well as checking the price; the roast etc. etc.

Terry S
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