Canon LTM QL 19 Front Element disassembly - more help!!

Canon M39 M39 screw mount bodies/lenses
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Ralf

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Thanks to Bob and Greyhoundman, I have got this far with taking the front element off. So far I have the rings, two palted, two screws and two red washers off. Now, I'm trying to get the glass element off. The notches that are prominent and easily seen, will not budge. Do I need a little more force?? Or have I missed something. Any advice is much apprciated. Attached is a photo of where I'm up to!

Ralf
 
Hi Ralf,
The next step is to unscrew the lens. They can be quite stiff to start as they were sometimes "locked" in with shellac. You may need a little more force. However, be careful not to slip and mark the element. If you scratch the paintwork around the outside this can be touched up but the lens can't be.

Regards
Kim

Ralf said:
Thanks to Bob and Greyhoundman, I have got this far with taking the front element off. So far I have the rings, two palted, two screws and two red washers off. Now, I'm trying to get the glass element off. The notches that are prominent and easily seen, will not budge. Do I need a little more force?? Or have I missed something. Any advice is much apprciated. Attached is a photo of where I'm up to!

Ralf
Click to expand...
 
Thanks Kim, but I can see two rings that could be undone, (they have notches in them). One is bold and solid, made of steel, you can see in the photo where I've scratched the paint close to it. There is a second ring, much close to the lens element, and smaller in diameter. Do I need to undo both, or one only. And if so, which one??

Cheers
 
Use the outer ring (slotted) to get the lens group out. That is what you need to do to get to the shutter/aperture blades. If you are trying to clean the elements in the lens group, such as if haze is between them, you will need to undo the inner ring as well. You may try a little alchohol or lighter fluid around the ring if it is really stuck. I have not had to do this latter step.
 
Now that outer ring does undo counter-clockwise doesn't it. And do I need to remove any screws first. It is awfully tight. So much so that I've been using increasing force, the last attemp (using a small hammer and screwdriver, split the metal at the notch. I'm past the point of no return now, that lens is coming out one way or another!! Help
 
Hi,
You shouldn't need to use a hammer! Try some nail polish remover to loosen any shellac.

Kim

Ralf said:
Now that outer ring does undo counter-clockwise doesn't it. And do I need to remove any screws first. It is awfully tight. So much so that I've been using increasing force, the last attemp (using a small hammer and screwdriver, split the metal at the notch. I'm past the point of no return now, that lens is coming out one way or another!! Help
Click to expand...
 
OK, now I have the lens out. And it did take a "medium" hammer. I bathing the lens in alcohol (I don't have zippo of Ronsonol). Nothing's happening. Does it need to be swishing arounf in there. I'm using a Q tip, and gently wiping residue from around the inside of the thread, probably from shellac or whatever it is. I'm getting there, and have lost any sense of finesse for this camera. Thanks in advance.

Ralf
 
Yup. Only a medium one tho, and it done good. Afterall, it was upi folk on the list who said I needed more force!! And it was never going to come loose without something serious like that.

I'm now working the alcohol into the blades which has worked a little, but doesn't seem to be improvig at all now. And I have a drop of alcohol on the rear element which I can see when I open the back. This is turning pretty ugly, and I dont wan't to have to get that hammer oout again unless those blades absolutely need it. Percussion therapy!!!

Ralf
 
How many applications is many? Roughly speaking. although I guess every situation os different

I've been putting a short squirt of Zippo fluid onto the blades, and then working the shutter with the shutter release repatedly. It has freed up a little, but really, the shutter is moving 1/8 inch at best. I estimate I've put about 1 oz of fluid in there over the course of last night and today. The shutter has been fired 2-4 thousand times. I'm

The aperure blades have freed up, althouth the movement of the blades is very slow.

Should I be massaging the blades in any way, or it is best to leave them alone?
 
Hi Ralf,
I am afraid it takes as many as it needs. What you need to do is to apply the ronsonol using a qtip and then using a clean one is the "dry" it off. The idea is to remove any rubbish. If you just squirt the ronsonol on, it will disolve the muck but leave it behind as it dries. As least you know the shutter is working. Also having done an application, it is important to let things dry out to make sure it's working. Any liquid can have enough surface tesion to stop the blades in small amounts. The secret is patience.

Regards
Kim

Ralf said:
How many applications is many? Roughly speaking. although I guess every situation os different

I've been putting a short squirt of Zippo fluid onto the blades, and then working the shutter with the shutter release repatedly. It has freed up a little, but really, the shutter is moving 1/8 inch at best. I estimate I've put about 1 oz of fluid in there over the course of last night and today. The shutter has been fired 2-4 thousand times. I'm

The aperure blades have freed up, althouth the movement of the blades is very slow.

Should I be massaging the blades in any way, or it is best to leave them alone?
Click to expand...
 
Hey Ralf! Don't give up!!!! Like you, the only thing I had at my disposal was denatured alcohol. I bathed blades with a Q-tip, fired the shutter a few times and then mopped it up with a corner of a paper towel. Repeat. Then repeat again - and again, and again, and yet again!

They'll loosen up, don't despair! :p

Mike :D
 
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