Holgas beware!

venchka

venchka

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The Beast is getting a new lensless lens.

Pentax 67 body cap modified for pin hole photography by Minute Aperture Imaging.

PENTAX%2067%20WITH%20PINHOLE%20BC-LOWER%20RIGHT.jpg


This will be soooooooooooooo cool!
 
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Clueless

Clueless

dazedgonebye said:
What focal length and aperture do you manage with that beast? Size of the hole?
Click to expand...

I'm sorta clueless. The seller sent this:

The instruction sheet says "aperture = .342mm/.0135 inches f = 244"
The angle of view is the equivalent of an 84mm lens on a 6x7 camera.
Click to expand...

My Gossen meter stops at f/128. I can estimate from there.

This big boy should be able to out Holga the Holgas and make a bigger negative in the process.

Lighten up! ;)
 
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Google "pinhole designer" software.
You can input the FL and fstop info and generate exposure tables including reciprocity data for a number of films.
The charts are set up for metering at f22. You meter at f22, it gives you the proper exposure considering your actual aperture and reciprocity.
I've gotten very good results with this.
 
Thanks Steve! That sounds like a lifesaver. Since the focal length is longer than I would like for 6x7, I'm hoping that I can attach the body cap/pinhole to an empty lens board for use on one of my 4x5 cameras.
 
dazedgonebye said:
Google "pinhole designer" software.
You can input the FL and fstop info and generate exposure tables including reciprocity data for a number of films.
The charts are set up for metering at f22. You meter at f22, it gives you the proper exposure considering your actual aperture and reciprocity.
I've gotten very good results with this.
Click to expand...

It's here: http://www.pinhole.cz/en/pinholedesigner/

I can recommend it, excellent little program.
 
As Steve mentions if you check out Mr. Pinhole or similar they will also tell you how to adjust your light meter ISO to simulate it going beyond f/128.
 
venchka said:
Thanks Steve! That sounds like a lifesaver. Since the focal length is longer than I would like for 6x7, I'm hoping that I can attach the body cap/pinhole to an empty lens board for use on one of my 4x5 cameras.
Click to expand...

I'm using a skink (search ebay) pinhole adapter for my graphic lens board. I've got two...one with a .250 pinhole and the other with a nail sized hole that I use to compose.
Very nice to be able to compose a pinhole image on ground glass.

3621380616_677f8bdd3c.jpg
 
You may be on to something. Lenses? Who needs them.

Barry's 2-bath I presume? Where do you buy your chemicals? I have the sodium sulfite and a scale. All I need is metol and Kodalk. Correct?
 
I made one for an 8x10, really looked too much like a lens, however, those long exposures let you do some interesting stuff, plus the depth of field.

Never used much for light meters for pinhole, 30 seconds seemed to work on most.

I was often shooting ortho and inspection developing in paper developer. ;)

A single roll should zero you in fairly well, plus when you buy commercial pinholes they often give a few hints.

Watch shooting into the sun.

Eric Renner's books are terrific.

Regards, John
 
venchka said:
You may be on to something. Lenses? Who needs them.

Barry's 2-bath I presume? Where do you buy your chemicals? I have the sodium sulfite and a scale. All I need is metol and Kodalk. Correct?
Click to expand...

Bath A
80 g sodium sulfite
6.5 g metol
Make up to 1 L with water

Bath B
12 g sodium metaborate (Kodalk)
Make up to 1 L with water

Freestyle photo sells it all pretty cheaply.
 
I have a suggestion for solving the "the image is too dark to compose" problem. I got it from the color seperation filter gizmo from my 1950's vintage Kodak Precision enlarger, which consistsof a swinging plate below the lens with three holes, one for each of the color filters.

It should be easy enough to design and make a swinging, or rotating, thing that would have a large enough pin hole to see what's in the picture and one or more little pin holes for actually making the exposure. Just swing the one you want in front of the film. Polaroid used to make a gizmo when they first came out with "3000 Speed Film" that fit over the lens and had a flip-up "pin hole" for use with the ultra high speed film.
 
I roll it in a jobo tank for 4.5 minutes each bath. Time/temp are really not that important past about 4 minutes. It's pretty much an auto-pilot thing...which works if you happen to be ADD crippled and not normally to be trusted with chemicals.
 
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