Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,291   Posts: 1,535,431   Online: 812
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1

    Join Date
    Aug 2009
    Location
    Reykjavík, Iceland
    Shooter
    Medium Format
    Posts
    19

    Using 300W ELH bulbs in old spec Multigrade 500H

    I was wondering if anyone had any experience in using the newer 300W bulbs in the older version of the Mulitgrade 500 head. My head is older and does not have heat shields, but I am curious if this is a real issue. Or maybe it is just an insurance company mandated precaution? If it is important, is it possible to DIY the heat shields? I have seen the picture of their diagram in another thread, but I have not seen them in an enlarger. Does anyone with a newer Multigrade 500 mind snapping a photo of what they look like installed in head?

    Thanks very much,
    Stuart

  2. #2

    Join Date
    Jul 2007
    Location
    London, England
    Shooter
    35mm
    Posts
    113

    500h

    I've got 2 of these. Greedy I know but I started over 50 years ago with a Johnson and Johnson contact printing frame for 127 film, and only finally got to this sort of gear 3 years ago, just before I retired. Any way I bought them on eBay attached to a Focomat 11c and a Durst DA900, one of the 500ss packed up and I got a replacement from eBay USA. To cut a long story short, neither is a 2nd generation model ie no heat shield blinkers or whatever they are; I know what you mean I've seen pictures. But, they both came with 300 w ELH bulbs fitted, so I am not sure the upgrade from 150 to 300 came with the fitting of blinkers; it may have come earlier. Or, when it came, users decided to fit the 300w bulbs anyway
    HST, I do find that despite the fans onto the bulbs down the flexible piping, there is a lot of heat; even 35mm film 'pops' within seconds of lighting up, so I use perforce double glass neg carriers. Might be able to get away with upper AN glass, glassless below - haven't tried yet.
    Richard

  3. #3

    Join Date
    Jul 2007
    Location
    London, England
    Shooter
    35mm
    Posts
    113

    Further thought

    Come to think of it, maybe the negatives wouldn't 'pop' if I downsized to 150w bulbs; there is power to spare and for a 5" x 7" print from an MF negative I am stopped down to f22 anyway.
    Richard

  4. #4

    Join Date
    Aug 2009
    Location
    Reykjavík, Iceland
    Shooter
    Medium Format
    Posts
    19
    Thanks Richard. At least it is good to know that the enlarger does not burst into flames if you fit the more powerful bulbs! I will try to find a few of both and see how it goes...I am putting together an order now, as it appears there are not any ELH or ESD bulbs anywhere in this entire country.

  5. #5
    L Gebhardt's Avatar
    Join Date
    Jun 2003
    Location
    NH - Live Free or Die
    Shooter
    Large Format
    Posts
    1,675
    Blog Entries
    1
    Images
    18
    I may go to the smaller bulbs. For 4x5 printing I am usually using a 2 stop ND filter too keep the aperture at f/8 or f/11 and the times above a few seconds.

    I also have two of the heads. One came with the add on heat shields. They aren't much more than metal plates on clips.

  6. #6
    DAP
    DAP is offline

    Join Date
    Jun 2008
    Shooter
    35mm RF
    Posts
    93
    There are two types of heat shields for these units. There are little white ones that clip onto the flexible cooling tubes. The other shields are larger black metal plates that screw onto the inside of the plastic endplates of the head. It seems like the white clamp-on shields were only produced for a little while (few heads have them - I have only seen them on the early 300w heads). The larger black metal shields are on every 300w head that I have ever come across (they protect the plastic sides from melting - don't know if you can get by without these...they should be easy to make if your head doesn't have them)

  7. #7

    Join Date
    Aug 2009
    Location
    Reykjavík, Iceland
    Shooter
    Medium Format
    Posts
    19
    Thank you all for the information. I think I will try to create some makeshift heatshields -- can't be too hard I think.

  8. #8

    Join Date
    Mar 2004
    Location
    New York
    Shooter
    4x5 Format
    Posts
    220
    Images
    36
    I have one with the clip on heat shields - they are to protect the wires from direct exposure to the IR from the bulbs - It would not be hard to make your own keeping an air space between the shield and the wiring to the bulb. But, why not just use the 150 watt bulbs - if you have the right mixing box for the format you are using there should be plenty of light.

  9. #9

    Join Date
    Aug 2009
    Location
    Reykjavík, Iceland
    Shooter
    Medium Format
    Posts
    19
    The reason I would rather use 300w bulbs is that neither bulb is available in Iceland, so I have to order from the US. At most sources I have seen, the ESD 150W bulbs are 20-35 dollars, the ELH 300w bulbs are 10-12 dollars. The ESD are rated for 12 hours average life, and the ELH bulbs are rated for 35 hours. So using the 300w bulbs saves me a lot of money -- I also have to pay 25% tax on the cost of the bulbs, as well as on the shipping, so it really adds up.

  10. #10

    Join Date
    Feb 2008
    Location
    Winnipeg, Canada
    Shooter
    Multi Format
    Posts
    1,301
    Have a look at topbulb.com, lower prices than what you have found.
    Also bulb specs are here http://www.ushio.com/files/catalog/PAVENT57-64.pdf

    And for all their catalog pages,

    http://www.ushio.com/products/catalog.htm#AVPE

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