Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,936   Posts: 1,585,627   Online: 745
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1

    Join Date
    Dec 2008
    Shooter
    Medium Format
    Posts
    9

    saunders LPL enlarger

    I've acquired a Saunders LPL dichroic enlarger (6X7) but light source is too dim with 150 watt bulb. Exposures are 1-2 min. at max. aperture. How do I brighten this. Is there any detailed user info. out there?

  2. #2
    Jon Shiu's Avatar
    Join Date
    Dec 2003
    Location
    Elk, California
    Shooter
    Plastic Cameras
    Posts
    2,593
    Images
    33
    Something is wrong here. A normal exposure is something like 10 seconds at f11 with 82W bulb, with Ilford Multigrade IV paper. Which model of enlarger is it and what light bulb do you have? I suspect the bulb is wrong. Also, what paper and developer are you using? Is your negative of normal density (one way to check is to lay the neg on a newspaper and see if you can see the writing through the dense parts).

    Jon
    Mendocino Coast Black and White Photography: www.jonshiu.com

  3. #3
    slumry's Avatar
    Join Date
    Sep 2007
    Location
    Washington State
    Shooter
    4x5 Format
    Posts
    127
    I agree something is wrong here. I have an LPL 4550 and had a similar experience. I was using an odd paper; it had a smooth side and a grainy side and I assumed the smooth side was the emulation side. It was not; however if I exposed for a minute to two minutes I would get an image. Flip the paper and everything was normal.

  4. #4
    david b's Avatar
    Join Date
    Oct 2003
    Location
    None of your business
    Shooter
    Medium Format
    Posts
    4,034
    Images
    30
    On the 4550 there is a knob on the side that cuts the light in half. Is there one on your enlarger?

  5. #5

    Join Date
    Jan 2005
    Location
    Live Free or Die
    Shooter
    Multi Format
    Posts
    4,566
    Images
    91
    On the 4550 there is a knob on the side that cuts the light in half. Is there one on your enlarger?
    This is my thinking too. Another possibility might be a defective power supply, but the light control is more likely assuming it has one.
    Also,
    Do you have any cyan filtration dialed in? Are all three filter controls working properly?
    Are the contacts for the bulb clean?

  6. #6

    Join Date
    Dec 2008
    Shooter
    Medium Format
    Posts
    9
    Thank you very much for the reply. If you'll bear with me, there is a yellow lever on the left that turns a 'White' light on and off, and there's an increase in light with it in the off position. I think the bulb is correct, an intense 100 w halogen dichroic - the highest wattage available with a two-pin plug and 12 volt power supply. The enlarger appears rather new. Dial filters appear to work. I'm coming from years of using an omega/aristo cold light head. But with 16 X 20 prints the far edges were short on exposure and Bruce Birnbaum told me to get the saunders lpl. I notice the inside of the white light reflection box is lined with what appears to be white styrofoam, of all things. Mechanically, the thing all seems to work fine. This particular bulb heats to 500 degrees C. I could have an electrician remodel to higher wattage power supply and bulb, perhaps???
    Any further ideas are much appreciated. thank you very much... Johan (in Maine, US, where there's not a lot of help with this kind of problem).

  7. #7
    david b's Avatar
    Join Date
    Oct 2003
    Location
    None of your business
    Shooter
    Medium Format
    Posts
    4,034
    Images
    30
    What model enlarger do you have?

    Also, your first post says you have a 150w bulb and your last post says 100w bulb. Which one?

  8. #8
    RH Designs's Avatar
    Join Date
    Apr 2003
    Location
    Yorkshire Dales, England
    Shooter
    Multi Format
    Posts
    657
    Images
    18
    If it's an LPL C7700 (which is sounds like) it's not an especially bright enlarger. You don't say what paper you're using or what size prints you're making but for 16x12 on for example Multigrade Warmtone, a minute or so isn't that unusual I'm afraid, in my experience at least. The correct lamp for the C7700 is 12v 100W. A new one might help - old lamps can get cloudy and I've seen a one stop improvement in output when I've replaced a blown one.
    Regards,
    Richard.

    RH Designs - My Photography

  9. #9

    Join Date
    Mar 2008
    Location
    Yorkshire, UK
    Shooter
    Multi Format
    Posts
    333
    I have an LPL 6700, and I found about a stop increase in brightness when I replaced the bulb with a new one, that would equate to a change from 1 minute to 30 seconds - I regularly print at 30-45 seconds at say f11 on my 6700 at 12x16", so perhaps you're not too far out here.

  10. #10
    naeroscatu's Avatar
    Join Date
    Oct 2004
    Location
    Newmarket Ontario
    Shooter
    Multi Format
    Posts
    857
    Images
    39
    You should check the specs in the manual then verify if you have the correct lamp in your dichroic head.
    you also need the manual to get familiar with all the knobs and functions. I have the LPL 4550 and it works very well: there is a knob that switches the light source to full power and a lever that disengages the filters leaving you the white bright light to focus and frame before the exposure.
    Mihai Costea

    "There's more to the picture
    Than meets the eye." - Neil Young

    Galleries:My PN & My APUG

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin