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  1. #1

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    Canon 28-70 EF Macro

    Is an incredibly easy lens to repair.

    Just wanted to say that.
    5x7 Eastman-Kodak kit / B&L 135mm Zeiss Tessar + Compur Deckel
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  2. #2

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    and its broken permanently......someone dropped it. The front element is loose and the part that holds it is snapped.
    5x7 Eastman-Kodak kit / B&L 135mm Zeiss Tessar + Compur Deckel
    4x5 Graphic View, made in USA! New project
    RB67 Pro S /50 4.5 / 90 3.8 / 180 4.5 / WLF / prism finder / polaback
    Random 35mm stuff

  3. #3

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    Duct tape?

  4. #4

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    Lol

    The front element only moves like 2 mm I'm thinking I might glue it in place or something and sacrifice 5 or 10mm or focal length for an awesome macro lens. I rarely shoot macro anything over 50mm anyway.
    5x7 Eastman-Kodak kit / B&L 135mm Zeiss Tessar + Compur Deckel
    4x5 Graphic View, made in USA! New project
    RB67 Pro S /50 4.5 / 90 3.8 / 180 4.5 / WLF / prism finder / polaback
    Random 35mm stuff

  5. #5
    Andrew K's Avatar
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    you've broken the front focus barrel. It's a plastic part that is held in place by 2 screws (these are zoom guides that move the front element when you zoom the lens)

    It is a very common part to break. I've probably repaired a hundred or more over the years when I was a camera tech. The replacement part is basically the same as the front barrel from a EF 35-70 of the same period.

    They are pretty straight forward to pull apart once you've done a few...but without a replacement part??
    A camera is only a black box with a hole in it....

    my blog...some film, some digital http://andrewk1965.wordpress.com/

  6. #6

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    same as the ef 35-70? what about the 35-80 there's a couple cheapies in the local pawn shop.

    I'll take a picture and post up what I broke exactly. I will probably need your help in getting it apart and back together lol. I know my way around tools I just did a timing belt and water pump on my Ford Probe 2.0L 4 cyl so a lens shouldn't be too bad
    5x7 Eastman-Kodak kit / B&L 135mm Zeiss Tessar + Compur Deckel
    4x5 Graphic View, made in USA! New project
    RB67 Pro S /50 4.5 / 90 3.8 / 180 4.5 / WLF / prism finder / polaback
    Random 35mm stuff

  7. #7
    Andrew K's Avatar
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    sorry the 35-80 is totally different, adn about 20 times easier to repair.....it's always the way

    Not to wory - post a photo of what is broken, and I'll see if I can't help you get it fixed

    Cheers
    A camera is only a black box with a hole in it....

    my blog...some film, some digital http://andrewk1965.wordpress.com/

  8. #8

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    Okay, here is what I am working with.

    This is the front element, the part next to it is what broke.



    This is where it is supposed to be, as noted by the arrows.



    So basically I have to find a Canon 35-70? I'm going to go check the pawnshop up the street see if they have one. Someone brought it a ton of old EF Canon stuff.

    Here's a part that looks like what I need but doesn't look like the part I have in front of me. I've actually thought about disassembling the original lens and just gluing the whole thing back together and being really careful when I handle the lens lol.

    The lens I have is actually an EF 28-70 Macro f3.5-4.5 II. Looks like a great piece of glass just needs fixing. I need a macro lens for my Rebel.
    5x7 Eastman-Kodak kit / B&L 135mm Zeiss Tessar + Compur Deckel
    4x5 Graphic View, made in USA! New project
    RB67 Pro S /50 4.5 / 90 3.8 / 180 4.5 / WLF / prism finder / polaback
    Random 35mm stuff

  9. #9
    Andrew K's Avatar
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    Hi

    yes the part on ebay is the same part - someone has removed it from a used lens and it is a second hand part (probably). The lens unit and the front barrell were seperate parts with different part numbers...

    All you need is the barrell - which you can take from either a EF28-70 or a old EF35-70 lens - they were pretty much interchangable. Your only problem is that this is also the most common part to break...

    I'll have a search around and see if I can locate the part you need - I may have one in a drawer - or one of my tech friends may have one..

    BTW - have you already de-soldered the back end of the lens and removed the inner barrel from the lens to ge tto the front focus barrell?
    A camera is only a black box with a hole in it....

    my blog...some film, some digital http://andrewk1965.wordpress.com/

  10. #10

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    No, actually I put it back together except the front element and figured I'd get it apart again when the time came. How the hell do you do all that? I've got a nice iron here and I'm no stranger to soldering, just to lens disassembly.
    5x7 Eastman-Kodak kit / B&L 135mm Zeiss Tessar + Compur Deckel
    4x5 Graphic View, made in USA! New project
    RB67 Pro S /50 4.5 / 90 3.8 / 180 4.5 / WLF / prism finder / polaback
    Random 35mm stuff

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