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  #21  
Old 26th July 2020, 04:28 PM
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Default Caffenol - C

Hi All.

Everything now on order, hope to get something to show soon.

I've been reading upon Harman Direct Positive Paper and have seen some pretty good results using Caffenol C, which seems pretty easy to make up and is relatively "green", something I could mix up away from home (I will most likely be using the pinhole while in our holiday caravan).

this site seems pretty useful

http://ueberlicht.com/2012/harman-di...t-in-caffenol/

Anybody any recipes that they have used successfully ? (loads online, but trust FADU members more)

As usual any tips, hints or observations most welcome.

Ian
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  #22  
Old 1st August 2020, 12:34 PM
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Well, things have not gone to plan, but hey ho, that's life.

The "hole" I had ordered seems to have been lost in the post, so have had to resort to a home made hole, no idea what the f number is, but guessed at around f256 (0.55mm / 140mm)

First test of the camera was this morning (full sun @ 2min) with disappointing results, although I did a bit of an image (see attached) as you can see 1/2 a picture is better than no picture

Dev Tetenal Eukobrom 1+4 90sec, as per bottle, would longer be better ?,
Stop Rollei RCS 30sec
Fix Rapid Fixer 1+4 60sec, as per bottle

This is where my really limited knowledge fails me, being direct positive paper, I'm confused as to if I need a longer exposure or a shorter exposure.
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  #23  
Old 1st August 2020, 01:23 PM
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Yes it needs longer exposure. Black is under exposed unlike regular b&w photo paper and too white is over exposure. Keep plugging away!
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Old 1st August 2020, 01:25 PM
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Which iso/asa did you rate the paper at?
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  #25  
Old 1st August 2020, 01:38 PM
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Hi Marty,

I used 1.5 as this is on the Ilford Pinwheel and seemed a good place to start

Ian
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  #26  
Old 2nd August 2020, 11:43 AM
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Quote:
Originally Posted by CambsIan View Post
I'm confused as to if I need a longer exposure or a shorter exposure.
Quote:
Originally Posted by MartyNL View Post
Yes it needs longer exposure. Black is under exposed unlike regular b&w photo paper and too white is over exposure. Keep plugging away!
I'm a bit confused too Ian.

My initial thinking is that you need a bit LESS exposure...

As the shadows are more grey than black, wouldn't that mean you've give TOO MUCH exposure, with an even longer times making the shadows lighter still?

I'm open to being persuaded otherwise though and I can see my little brain ticking away for a while now to come up with the right answer.

I think I'll re-read the Ilford page about positive paper, so I might be back later.

Terry S
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Old 3rd August 2020, 12:23 AM
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Terry, it's perhaps hard to say without knowing the original scene, although where I consider maximum black with a negative print, the same could be said of maximum white with a positive print.
The print appears to lack contrast through out, which seems a little odd considering both the light conditions and the DPP's contrast rich characteristics.

And I'm not familiar with this developer but in my own, admittedly limited experience, I found the paper very developer intensive; meaning the paper exhausts (even fresh) developer much more quickly than regular photo paper.

Ian, is there anyway of doing a kind of test strip with the exposures?
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  #28  
Old 3rd August 2020, 11:20 AM
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Hi Marty, Hi Terry,

Thanks for the replies.

Looking at maybe having a go at a couple of shots in the next day or so but will mix up a new batch of Multigrade at 1+14 and give it the full 5 min (the Harman DPP sheet recommends 2.00 to 5.00 mins)

Am using a Paterson print drum ( uses 2oz /55ml for a 8 x 10 print) so think I'll use about 75 - 100ml as a one shot developer.

Hopefully post the pic's here in a few days.

Ian
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  #29  
Old 3rd August 2020, 11:50 AM
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Quote:
Originally Posted by MartyNL View Post
The print appears to lack contrast through out, which seems a little odd considering both the light conditions and the DPP's contrast rich characteristics.

And I'm not familiar with this developer but in my own, admittedly limited experience, I found the paper very developer intensive; meaning the paper exhausts (even fresh) developer much more quickly than regular photo paper.
Looking at the print once more Marty, you may be right. It could well be exhausted developer that has given the print a dull grey instead of a good black.

And having looked at the print carefully, I note that neither of the borders at the top and at the RHS are black, as expected, so you may be right.

I've also just done a quick edit of the picture, with the borders at what I presume the right tone, and it does produce a rather dark picture. Not knowing when it was taken it may well be too dark and if so, again as you said, it may need more exposure as well as more developer.

Terry S
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  #30  
Old 3rd August 2020, 01:07 PM
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Hi Terry.

Picture was taken in my back garden around mid morning in full sun.

Ian
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