Canon 28-70 EF Macro

[j-dogg]

Is an incredibly easy lens to repair.

Just wanted to say that.

[j-dogg]

and its broken permanently......someone dropped it. The front element is loose and the part that holds it is snapped.

[waltereegho]

Duct tape?

[j-dogg]

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.

[Andrew K]

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??

[j-dogg]

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

[Andrew K]

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

[j-dogg]

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.

[Andrew K]

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?

[j-dogg]

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.