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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
Expire: 2014-01-07
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 Posted: Wed Nov 20, 2013 7:12 pm Post subject: Box camera help needed |
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iangreenhalgh1 wrote:
Hi folks
I've turned a cardboard box into a rudimentary 8x10 camera to try out a legendary 8x10 lens before I give it back to a friend.
It's 312mm focal length, so what I need to know is this - do i place the film plane 312mm from the back of the lens or 312mm from the iris/vertex of the lens? Assuming infinity focus of course.
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Xpres
Joined: 11 Dec 2007
Posts: 964
Location: UK
Expire: 2014-10-28
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| Posted: Wed Nov 20, 2013 7:59 pm Post subject: |
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Xpres wrote:
The distance from the back of the lens to the film plane is the back focal distance which is not the same. The focal distance is from something called the rear nodal point to the film plane and its position depends on the type of lens. If there is an aperture, or slot for stops, that might be a good place to start.
You could use a box within a box and some tracing paper to visually work it out as you build your camera?
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
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| Posted: Wed Nov 20, 2013 8:06 pm Post subject: |
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iangreenhalgh1 wrote:
I guess I'll have to use a sheet of white paper and see where I get a focussed image, like a camera obscura.
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I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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philslizzy
Joined: 07 Aug 2012
Posts: 4745
Location: Cheshire, England
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| Posted: Thu Nov 21, 2013 12:42 am Post subject: |
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philslizzy wrote:
I thought you would have know that Ian! You will when you've tried this! Good luck.
oh any caffenol recipes for paper?
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David
Joined: 13 Apr 2011
Posts: 1869
Location: Denver, Colorado
Expire: 2013-01-25
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| Posted: Thu Nov 21, 2013 12:56 am Post subject: |
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David wrote:
Stop it down to f165 and call it a day.
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
Expire: 2014-01-07
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| Posted: Thu Nov 21, 2013 9:05 am Post subject: |
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iangreenhalgh1 wrote:
I've got x-ray film and dk-50 to use, or paper and d163 as a backup.
It only stops down to f64 and it's stuck at f22, the aperture needs servicing.
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kansalliskala
Joined: 19 Jul 2007
Posts: 5046
Location: Southern Finland countryside
Expire: 2016-12-30
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| Posted: Thu Nov 21, 2013 3:06 pm Post subject: |
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kansalliskala wrote:
| iangreenhalgh1 wrote: |
| I guess I'll have to use a sheet of white paper and see where I get a focussed image, like a camera obscura. |
and you get the circle size that way too
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MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
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monkjason
Joined: 02 Dec 2013
Posts: 301
Location: Beijing, China
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| Posted: Mon Feb 24, 2014 3:51 am Post subject: Re: Box camera help needed |
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monkjason wrote:
| iangreenhalgh1 wrote: |
Hi folks
I've turned a cardboard box into a rudimentary 8x10 camera to try out a legendary 8x10 lens before I give it back to a friend.
It's 312mm focal length, so what I need to know is this - do i place the film plane 312mm from the back of the lens or 312mm from the iris/vertex of the lens? Assuming infinity focus of course. |
Hi did you check the inbox? what about the two lenses deal? 
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I like Hexanon and EBC.
Cameras: Pentax K01, Konica T3N chrome and black, Minolta XD11, Porst CR-7
Konica Lenses: UC Hexanon 35/2, UC Hexanon 28/1.8AE, UC Hexanon 15/2.8AE Fish-eye, UC Hexanon 80-200/4AE, UC Hexanon 45-100/3.5AE, UC Hexanon 400/5.6AE, FL-Hexanon 300/6.3AE, Hexanon 85/1.8AE, Hexanon 24/2.8 F22 Version, Hexanon 35/2AE, M-Hexanon 50/2, M-Hexanon 35/2
Minolta Lenses: MC Rokkor-X 35/1.8，MD Rokkor-X 50/1.2
Fujifilm Lenses: Porst UMC 50/1.2 |
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