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  #1  
Old 21st February 2019, 06:56 PM
KidderJem KidderJem is offline
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Default Durst DES 100 TPA

Hi all.

Been doing some colour printing recently, mainly to calibrate a Durst DES 100 CA that I picked up a while ago.
In doing so I have used up a fair bit of paper but I have the required filtration and timing (well timing is almost as the last two prints were a little darker than I would have liked) pretty well judged. The main thing is the filtration.
One of the downsides is that the calibration is for only ONE type of negative and paper.
So question. Does anyone use a Durst DES 100 TPA, what exactly does it do, and will it help with reducing paper waste in getting accurate colour filtration results? I looked on YouTube but can see nothing posted.
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  #2  
Old 21st February 2019, 07:17 PM
John King John King is offline
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Default Colour Balance

When I started out colour printing very nearly 30 years ago I was given on piece of very good advice and that was to take a photograph of a 37% grey card. This should be done in good daylight, not shady and not in direct sunlight.

Print this normally to get a perfect or very close match to the original grey card and use this as a base for all the other prints you make from that film.

Incorrect printing exposure WILL alter colour balance so getting that right will be a big step towards getting the balance correct.

That aside, the PH of the developer, the temperature is critical and must not vary by more than 1/2 degree, preferably less. If your enlarger does not have a voltage stabiliser (not the same as a transformer) may change the colour of the enlarger bulb and so change the colour balance of the print. Even the same make of printing paper but from a different batch will make a difference.
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Old 21st February 2019, 07:55 PM
alexmuir alexmuir is offline
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Default

I haven’t done any colour printing, so I’m not able to advise on the methods. I did, however, acquire one of these Durst metering devices. The problem you may encounter is that it uses an obsolete mercury battery. If I recall correctly, one component requires its own button cell, and this is one of the 1.35V types which can be difficult to replace. The problem, of course, is that you cannot guarantee the accuracy of readings if it’s running on a different type of battery. I had planned using mine as a simple B&W printing meter, but gave it away when I discovered the battery issue.
Alex.


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  #4  
Old 21st February 2019, 08:40 PM
KidderJem KidderJem is offline
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Default

Thanks for the reply chaps.
A lot to consider.
The grey card method sounds promising.
Didn't realise the effects of voltage stabiliser v transformer. My enlarger is a transformer only.
Also the paper batch.
Wow, lots to consider with colour.
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