Cleaning LF Lens

Discussion in 'Medium Format & Large Format' started by SoulfulRecover, Jul 12, 2016.

  1. SoulfulRecover

    SoulfulRecover Been spending a lot of time on here!

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    I noticed that the inner glass elements have some dust specs on them and I would like to clean them. I see that there are two notches on the front of the lens and I am assuming I can use those to twist the front element off. Is that all there is to it? I don't want to force it or break anything.

    [​IMG]


     
  2. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    If you have a spanner wrench, you can certainly try it. Who knows how much force will be needed?
     
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  3. SoulfulRecover

    SoulfulRecover Been spending a lot of time on here!

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    I do/did somewhere. As long as one of the techs from my old work didn't steal it out of my box.
     
  4. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Sticking up like it does, you may be able to use a butter knife.
     
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  5. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    Actually since you've got the room, I would make my own "wrench". Take a piece of appropriate sheet metal (the largest that will still fit in the notches), and then file out openings so that it rests inside the lens opening and overhangs the outside (taking care to make sure it's well clear of the optical elements), and make the whole thing about 6" long and 3" high. This will let you get a good grip without exerting ridiculous leverage on anything and the notches in your wrench will help to prevent it from "jumping" off the lens and damaging anything.
     
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  6. cgw

    cgw No longer a newbie, moving up!

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    Dust specks in a LF lens? Curb the OCD and just shoot it unless they're degrading your images--which I suspect they're not. A sticky shutter is one thing but minor dust?
     
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  7. compur

    compur No longer a newbie, moving up!

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    On most lenses of this type the whole front and rear lens groups twist off (from the shutter) as a unit.

    I would do that and blow out any dust.

    Going any further (i.e., separating individual elements) on an old lens is risky.
     
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  8. SoulfulRecover

    SoulfulRecover Been spending a lot of time on here!

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    Maybe I am being OCD about it? Ive only shot 3 images with this lens so far (waiting on 4 from the lab currently) and I figured if it really is as easy as unscrewing the front and back of the lens, why not give it a clean. Looking through it wide open it just seems like it could use it. Maybe not? I don't really know.

    The 3 images I have gotten back had a couple spots on them which to me seemed like dust specs but it could have been from the scanner easily.

    Ill see if I can take a photo through the lens this evening that will show the dust.
     
  9. compur

    compur No longer a newbie, moving up!

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    Specks inside a lens don't cause specks on a negative.
     
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  10. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Neither does specks on the body of the camera. But that doesn't mean you can't clean it off.
     
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  11. SoulfulRecover

    SoulfulRecover Been spending a lot of time on here!

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    more there than what I could photograph but:

    [​IMG]

    [​IMG]
     
  12. unpopular

    unpopular Been spending a lot of time on here!

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    You can, sure, but it won't make *any* difference other than cosmetic.

    That's fine, if that's important to you, but heck, plenty of old lenses out there had bubbles.
     

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