Canon LTM Original QL17 aperture blade question

Canon M39 M39 screw mount bodies/lenses
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i recently acquired an original QL17 with the 45mm 1.7 lens. The meter works and the shutter speeds sound close. When i open the back and move the aperture ring..nothing happens...in other words the aperature doesnt get bigger or smaller. I have 7 days to return this camera. Is this a simple fix typically a'la ronsonol? anyone have any idea. Also the film speed ring is quite stiff. is there a way to dissemble and lube that?

I paid about $40 with s/h...what is one to do?
 
Silly question because I can't remember, but which side of the shutter is the aperture on? You might wish to look at the front of the lens in case that is where the change is happening.

William
 
i believe the shutter blades are the front, aperture is rear...i say that because when the shutter release is pressed, the front blades open.. i think,
 
Hi,
I am work at the moment so working from memory. The larger "Mk1" QL series are much easier to work on than the later small ones. The ASA ring does get quite stiff because a lot of muck gets trapped behind it. If you need to disassemble the front, giving it a good clean is quite easy. The diapraghm certainly sounds as though it is stuck. The aperture blades are at the rear on the early models. Are they stuck fully closed? If so, the ronsonal treatment could work. I have done about 5 and it worked on 4. Sometimes it takes quite a bit of perserverance to get them moving in the first place and then several applications. If they are not fully shut, there is a more serious problem that would need more than the ronsonal treatment. If you do decide to keep it, I am sure I or one of the others could "walk" you through a clean. As a final thought, you will probably want to replace the seals as well.

Regards
Kim

Unregistered said:
i recently acquired an original QL17 with the 45mm 1.7 lens. The meter works and the shutter speeds sound close. When i open the back and move the aperture ring..nothing happens...in other words the aperature doesnt get bigger or smaller. I have 7 days to return this camera. Is this a simple fix typically a'la ronsonol? anyone have any idea. Also the film speed ring is quite stiff. is there a way to dissemble and lube that?

I paid about $40 with s/h...what is one to do?
Click to expand...
 
A question: Do the aperture blades not move whatever you do? or they don't move only when you turn the ring?
I don't have the original model but the smaller GIII only. But i was surprised to see how it works: When I turn the aperture from large to small opening, it moves immediately. When I turn it from small to large however, it does NOT move until i wind/cock the shutter, in which moment it jumps to the value set. Since both my canonets do this, and the photos came out right, i suppose it's normal.
 
Hi,
The early Mk 1's are different. I am near certain that the shutter does not need to be cocked for the blades to move. In any case they should certainly move with the shutter cocked.

Kim

Pherdinand said:
A question: Do the aperture blades not move whatever you do? or they don't move only when you turn the ring?
I don't have the original model but the smaller GIII only. But i was surprised to see how it works: When I turn the aperture from large to small opening, it moves immediately. When I turn it from small to large however, it does NOT move until i wind/cock the shutter, in which moment it jumps to the value set. Since both my canonets do this, and the photos came out right, i suppose it's normal.
Click to expand...
 
Aperture movement is dependent on shutter release pressure - sometimes. Opening the ring will open the blades. Subsequently closing the blades will do nothing visually, but will preset a stop to which the blades will close upon shutter button pressure.
 
The aperture blades should work when pointed to light, set on Auto, when pressing the shutter. After aperture closing, the shutter fires. If I remember well, the manual aperture setting works directly. Irrespective of shutter depressing. Anyway, they should close - if necessary - when depressing the shutter.
If not, return it.

Rob.
 
I rehabbed one of these a few months ago, and I have one in process now.

The diaphragm blades are in back of the shutter and on this model, they tend to stick, even when the shutter itseelf seems to work fine.

Unscrew the front lens elements using a rubber chair tip (you may have to cut one to fit) and a lens spanner. The diaphragm is easier to get to from the front than the rear.

Lock the shutter open using a locking cable release. Apply a couple of drops of Everclear on the aperture blades they will loosen in a few minutes. Once they start moving easily, stop them down all the way and clean them with Everclear on applied with a tiny piece of cotton cloth wrapped around a toothpick. (Don't use a Q-tip). Also clean the back of blades bvy using a bent toothpick (or just go ahead and remove the back lens elements). Be sure to clean up the internal face of the lens element behind the diaphragm last.

Leave everything open to dry before reassemblt. I put it on a fireplace mantel in a air conditioned room overnight.

Re-assemble.

That model has a real nice lens, but even if you fix the diaphragm, the shutter will probably be a bit slow. If the diaphragm is gummed up, the shutter blades probably have a slight problem too.


-Paul
 
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