Pinhole and Wet Collodion?

[Daniel Grenier]

I know little about pinhole photography and I am curious about a possible application; that is 12x20 (or larger) wet collodion using a pinhole. Is that doable? Anyone doing such a thing here?

[glbeas]

Hmm, is there a danger the wet plate may dry out before the exposure is finished?

[Kerik]

Hmm, is there a danger the wet plate may dry out before the exposure is finished?

I would think so. Collodion is very slow. Today I was making tins and ambros under overcast and intermittent sun. My exposures were about 20-25 sec at f/11. If you exrapolate that out to pinhole sized f/stops and throw in some time for reciprocity, you'd end up with very long exposures and very dry plates.

Kerik
www.kerik.com

[Quinn]

I've done several "pinplate" images (wet plate pinhole). I've done both Ambrotypes and Ferrotypes/Tintypes.

In the winter/cooler months, I have about 15 minutes before my plate dries and I have employed some techniques that keep the plate from drying out.

Example: http://www.collodion.com/trucks_trees.htm

[John Bartley]

I've done several "pinplate" images (wet plate pinhole). I've done both Ambrotypes and Ferrotypes/Tintypes.

In the winter/cooler months, I have about 15 minutes before my plate dries and I have employed some techniques that keep the plate from drying out.

Example: http://www.collodion.com/trucks_trees.htm

Nice pinhole photo!!

My 4x5 homemade pinhole camera has an aperture ratio of f/280 and it takes on average about 15-20 seconds to expose Ilford MGIVRC paper (iso=6) on a sunny 16 day. How does that compare to the speed of wetplates?

[Daniel Grenier]

I've done several "pinplate" images (wet plate pinhole). I've done both Ambrotypes and Ferrotypes/Tintypes.

In the winter/cooler months, I have about 15 minutes before my plate dries and I have employed some techniques that keep the plate from drying out.

Example: http://www.collodion.com/trucks_trees.htm

Thanks for leading me to this great resource which I din't know about.
Much to read/learn about here, Quinn.

[Kerik]

In the winter/cooler months, I have about 15 minutes before my plate dries and I have employed some techniques that keep the plate from drying out. [/url]

Quinn,

Cool! What is the f/stop of your pinplate camera? Also, I'd be interested to hear about your techniques for keeping the plate from drying too quickly. Love your work, BTW!!

Kerik

[hermit]

Quinn,

Cool! What is the f/stop of your pinplate camera? Also, I'd be interested to hear about your techniques for keeping the plate from drying too quickly. Love your work, BTW!!

Kerik

Collodion dry-plates using the tannin process are not that difficult and while they would require a longer exposure time can take the long exposures required.
I used dry-plates all winter here in Idaho when it was too cold to go out and do the normal wet-plates, and was very pleased with them, and the freedom they give to shoot anywhere including places and weather conditions regular wet plates are not possible or practical.

You can find instructions for the basic tannin process for collodion dry-plates and the Russell modifications in the "Silver Sunbeam" http://albumen.stanford.edu/library/...am/chap37.html

As always;

J Truman

[Donald Qualls]

Yike! Where do you get the cadium iodide and cadmium bromide for this process?

And are you aware of the health and environmental issues with cadium salts? They're the reason for some of the emulsion changes and product deletions at Kodak and Ilford in the last couple decades -- it was impossible to reformulate particular products without greatly altering their properties, if the cadmium used in making them was eliminated, and prohibitively costly to meet worker safety and environmental requirements if the cadmium was kept in the process.

[Kerik]

Yike! Where do you get the cadium iodide and cadmium bromide for this process?

And are you aware of the health and environmental issues with cadium salts?

Artcraft Chemicals in NY carries these and other chemicals for the collodion process (as well as many other processes). The quantities of these salts used in the process are very small. For example, one formula that I've used contains 3 gm of cd bromide and 4 gm of potassium iodide in a final collodion solution of about 500 ml. And 500 ml of collodion goes a long way. Anyone getting into wet plate collodion should first educate themselves thoroughly on the hazards and proper handling of the chemicals involved and make judicious use of the proper personal protective equipment.

Kerik
www.kerik.com