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  1. #11
    Akki14's Avatar
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    Hm So you could change the situation by just doing single filtration instead of double... I don't find the exposure times change that much, maybe a few seconds per "grade" of added magenta. I print as grade 5 loads, not so much on anything below grade2...
    ~Heather
    oooh shiny!
    http://www.stargazy.org/

  2. #12
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    The thing that puzzles me is when reading about other people's printing they often say things like 'I made a test print at 10 seconds, f8'. Even with no filtration on in my enlarger there is no way I will ever get down to 10 seconds even at f4. Not that this is a terrible problem, I'm just curious...

  3. #13
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    Just for the record I have solved the problem. I replaced the bulb and now I have very short times much like the ones I read about. Now I can get less than 10 seconds with f5.6.

    The bulb was very dirty and obviously old. I didn't realise that these halogen lamps could deteriorate so much without actually blowing.
    Mark Tomlinson

  4. #14
    Dave Miller's Avatar
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    Quote Originally Posted by mrtoml View Post
    J

    The bulb was very dirty and obviously old. I didn't realise that these halogen lamps could deteriorate so much without actually blowing.
    They can, and as you found do. One factor to look at is the condition of the lamp socket, this also deteriorates and is worth replacing periodically, say every second lamp. Both the current flow and heat produced are high, which means the contact life can be short. When corrosion sets in the electrical resistance goes up, and illumination down as the current flow is restricted.
    Regards Dave.

    An English Eye


  5. #15
    mrtoml's Avatar
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    Quote Originally Posted by Dave Miller View Post
    They can, and as you found do. One factor to look at is the condition of the lamp socket, this also deteriorates and is worth replacing periodically, say every second lamp. Both the current flow and heat produced are high, which means the contact life can be short. When corrosion sets in the electrical resistance goes up, and illumination down as the current flow is restricted.
    Thanks for that info. I noticed that the socket looks a bit iffy. It took a bit of wiggling to get the bulb to come on. I presumed because of dirty contacts inside the socket. I will look into getting a new socket now too.
    Mark Tomlinson

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