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    Enlarging Meter-Timer

    This is not specifically a large-format product but aimed at analogue printing in general.
    Having previously posted here about other products we produce at DLG Electronics and had some very good...
  2. Re: Temperature-Compensating Developing Timer

    Now available at CatLABS in the USA.
    http://www.catlabs.info/product/temperature-compensating-development-darkroom-timer
  3. Re: Temperature-Compensating Developing Timer

    Different developers do indeed have different temperature coefficients; what is programmed in the unit is a compromise and corresponds to the Ilford time-temperature charts which are quite widely...
  4. Re: Temperature Compensating timer for the SP-445

    Neil, Drew,

    Completely agree with your comments on compensation being imperfect and the need to remain reasonably close to the “optimum” temperature.

    Although I have only very limited...
  5. Temperature-Compensating Developing Timer

    For those that do their own processing, we’ve started producing a new temperature-compensating timer.
    http://www.dlgelectronics.com/compensatingtimer.html
    We’ve manufactured a small initial batch...
  6. Re: Temperature Compensating timer for the SP-445

    I realise that this is an old thread but I found it when we were working on a new temperature-compensating timer, which is now available. It offers similar functions to the ZoneVI timer....
  7. Re: Large Format Focal Plane Meter - New Product

    Actually looking at this again I think I must agree that +/-4 is no enough and I should at least go to +/-6, more if other films give a better range.
    The advice I had when I designed the meter was...
  8. Re: Large Format Focal Plane Meter - New Product

    Here are the results from my calibration test exposures.
    I inserted a meter sensor in the back of the camera and measured its output at a given aperture when aimed at a grey test card in...
  9. Re: Large Format Focal Plane Meter - New Product

    Thanks. what sort of range can a film sensibly cover? I did run a series of 20 or 30 test exposures on Ilford HP5 as part of a calibration exercise (to calibrate a sensor against which each unit is...
  10. Re: Large Format Focal Plane Meter - New Product

    But isn't it the light actually hitting the film plane that you want to measure, since that is what the film records? I mean the whole point of metering in this way is to measure the actual amount of...
  11. Re: Large Format Focal Plane Meter - New Product

    Interesting. I don't know a lot about smart phone apps - I'll have to find someone that does.
    The only bit in my box that might be problematic in a smart phone is the front end stage. The signal...
  12. Re: Large Format Focal Plane Meter - New Product

    Thanks xkaecs, that's actually very informative and tells me it is at least feasible to meter off the ground glass. I am not sure why readings should be lower at the edges and corners of the image...
  13. Re: Large Format Focal Plane Meter - New Product

    Thanks for your interest!

    xkaes - I am interested in the feasibility of metering off the ground glass directly, and did have a concept using a pen-like sensor that you could put against the glass...
  14. Large Format Focal Plane Meter - New Product

    Hi All,

    My interest is not so much photography as electronics. I am here both for a bit of advice and to shamelessly plug my product.

    I developed a focal plane meter for my father's 4x5 Sinar...
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