Re: Hi all, and a bit of a newbie question.

[Russell J Rosener <rrosener@xxxxxxxxxxxxxxxx>]

On Wed, 8 Jan 1997, Tim Coffer wrote:

> Date: Wed, 8 Jan 1997 21:29:16 GMT
> From: Tim Coffer <MNHIV004@xxxxxxxxxxx>
> Reply-To: infrared-photography@xxxxx
> To: rrosener@xxxxxxxxxxxxxxxx
> Subject: Re: Hi all, and a bit of a newbie question.
> 
> Russ wrote about shooting Konica at ISO 100. I'm wondering how that
> translates to f-stop and shutter speed, considering the use of the
> #25 Wratten gel. Do you also use a polarizer on top of the gel, which
> would kill another 2 stops, reducing the ISO to 25?
> How grainy are the Rodinal images? Would D-76 give more or less grain?
> Other comments on the differences with these two developers, please....
> 
> 
Let me start by saying that no two photo systems are alike, and with
infrared film little variations make an even greater difference.

I don't use a polarizer, especially in the studio. The lights I used are
old tungsten hot lamps-like the ones they used for movies and studio shots
40-50 years ago. They put out a TON of light and heat, which is good when
shooting nudes in the winter!

I metered in the reflected mode using a Gossen Luna Pro F. The ASA was set
at 40, to take the effect of the filter into consideration. When I
processed the first roll in Rodinal 1:50 for 15 minutes. It showed bad
overexposure, so much so that I had to reduce the negatives in Potassium
ferricyanide. Avoid this! The second roll I cut my develpoment time to 10
minutes, and it was much improved, but still obviously overexposed. These
went into the reducer soup as well, but required less time.

So I arrived at a working ASA of about 100 using a handheld meter with
this setup. For daylight work and Konica I've found much the same ASA
works metering through the lens as well. I'll post some at the IR gallery
as soon as I shrink them.

Good luck.

Russ


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End of INFRARED-PHOTOGRAPHY Digest 173
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