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  1. #21
    sim
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    Hallo,

    F-Stop printing treats the paper exposure in the same way as exposure with the camera is treated ie in f stops rather than pure linear times e.g. shutter speeds going up in a non-linear sequence - 1 second, 2 sec 4 sec 8 sec 16 sec rather than 1sec, 2 sec, 3 sec, 4 sec etc. This does seem to be a natural way to deal with the darkroom exposure.

    I have only recently bought an RH Designs Stopclock Professional, having previously done the mathematical calcualtions in my head/bit of paper for F-Stop printing - it is best not to actually think of times with the timer but densities. If a print looks too light by say half a stop, the timer will calculate the extra time needed to get an extra half stop density from the base exposure. It sounds a bit complicated but the RH Designs timer ( there may be others) takes all the headache out of the calculations - bets bit of kit I have bought.

    Density starts to rule the printing process rather than times. I have found it soo much easier to concentrate on the actual print my printing is faster, better (I say so myself :-) ) and more enjoyable.

    Simo.

  2. #22

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    I've never used an f-stop timer but with the posts I see in this thread and many others I'm getting very tempted. I've also just acquired an enlarger with the Ilford MG head - and the RH Designs dedicated unit looks very well suited to my needs.

    As I'm in the middle of starting again in the darkroom my mission is to standardize and simplify every aspect of the process to make the time spent more productive for my needs. The RH Designs analyzer seems like a perfect fit - even though I just picked up a Colorline 5000!!

    Time to do some gardening and earn brownie points with the missus!!

    Bob H
    "Why is there always a better way?"

  3. #23

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    If I made a series of test strips of 4 seconds, 5 seconds, 6.4 seconds, 8 seconds, 10 seconds, 12.5 seconds and 16 seconds, would that be a two-stop range in one-third stop increments?

  4. #24

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    Yep.
    "Why is there always a better way?"

  5. #25

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    Quote Originally Posted by BobNewYork View Post
    Yep.
    Thanks, would simplify matters and I should be able to make a much more refined test strip from there.
    I get a feeling from the replies so far that many people are comfortable with f/stop printing while others are skeptical.
    Perhaps they find that f/stop printing works fine without the need to buy a dedicated f/stop timer, would that be a fair assumption?

  6. #26

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    There are others

    Just to keep the record "straight", the only other F stop timer I know of is the excellent one made by DA ( Darkroom Automation ). The DA F Stop Timer has been discussed here, along with the excellent timer made by RH Designs. Mr. Lindan and Dr. Ross have often contributed to the thread about F stop timers, and in general, have maintained a respectful and much appreciated collegial relationship. There are undoubtedly proponents of each timer, but upon analysis, I suspect ( not owning the RH timer does not allow me to speak with complete confidence ) that the differences between the two products are likely rather superficial in that each is capable of delivering the results promised. One is, forgive the analogy, a "Canon", and the other is a "Nikon".

    If there are any other F stop timers, then I am sure the group would like to learn of them. A search of the APUG archives will allow one to learn just about all that one needs to about both of these well made products. More information can be garnered from the respective web sites.

    Best of luck with which-ever of the timers one decides to use.

    Ed


    Quote Originally Posted by sim View Post
    Hallo,

    F-Stop printing treats the paper exposure in the same way as exposure with the camera is treated ie in f stops rather than pure linear times e.g. shutter speeds going up in a non-linear sequence - 1 second, 2 sec 4 sec 8 sec 16 sec rather than 1sec, 2 sec, 3 sec, 4 sec etc. This does seem to be a natural way to deal with the darkroom exposure.

    I have only recently bought an RH Designs Stopclock Professional, having previously done the mathematical calcualtions in my head/bit of paper for F-Stop printing - it is best not to actually think of times with the timer but densities. If a print looks too light by say half a stop, the timer will calculate the extra time needed to get an extra half stop density from the base exposure. It sounds a bit complicated but the RH Designs timer ( there may be others) takes all the headache out of the calculations - bets bit of kit I have bought.

    Density starts to rule the printing process rather than times. I have found it soo much easier to concentrate on the actual print my printing is faster, better (I say so myself :-) ) and more enjoyable.

    Simo.

  7. #27
    tbm
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    Quote Originally Posted by FirePhoto View Post
    I learned and used f/stop printing and split grade printing before I purchased my Stop Clock Pro, using an f/stop chart that I got from Ralph Lambrecht's web site. I believe that I could print just as well with a standard timer and the chart. But the timer makes my darkroom sessions more productive: if I decide, for example, that the highlights need to be just a little darker I can easily and quickly add 1/4 stop to channel 1, for instance. Or if I decide the picture needs a little less contrast I can quickly add 1/3 stop to the highlights on channel 1, and subtract 1/3 stop from the shadows on channel 2. The times for any burns that I have previously worked out are automatically recalculated to the new base times.

    The timer is simply a tool that makes me a more efficient printer, reduces math errors, and lets me think more about the product than the process. That said, you would have a fight on your hands if you tried to take it from me!
    I agree with your statements above, 100%, Dan! I love my StopClock Professional, too, in terms of the channels and f-stop adjujstments as well as the easy split-grade printing feature.

  8. #28
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    Looking over the RH Designs timer from the UK I didn't see a pound / dollar converter, is the timer only available from the UK or is there a distributer in the US? I wonder about the prices of the units. The cold light compensator is a good idea, if one get that model can it be used on halogen based light sources too without the compensator?
    Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand

  9. #29
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    Quote Originally Posted by Keith Tapscott. View Post
    I get a feeling from the replies so far that many people are comfortable with f/stop printing while others are skeptical.
    I think if you go back through the replies you will find that the only people who are skeptical of f-stop timers are those that don't have them. There are many who started out skeptical, got a timer, and instantly became converts.

    Darkroom Automation provides a 30-day money-back guarantee, if after using the equipment you are still skeptical then return it. Nobody has, that has to say something...

    I don't know that RH provides a similar guarantee in the UK, but I am under the impression it does.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  10. #30
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    An F-Stop timer is to the darkroom what the shutter-speed and aperture controls are to a camera. When was the last time you used a camera that didn't have marked controls?
    http://www.zone-10.com

    When you turn your camera on, does it return the favor?

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