chris_dilenardo Posted August 9, 2007 Share Posted August 9, 2007 hi all, just got a canonet ql25 from the bay, everything works(had to re cement and recalibrate the rangefinder mirror!)shutter speeds seem accurate on manual but when set to b you can see that the aperture never changes(seems around f11/16) is this problem easy to remedy, ive googled stuff on this and other canonets but always seems to be the shutter blades stuck, cant find anything on aperture blades,any one have any ideas cheers in advance chris Link to comment Share on other sites More sharing options...
greyhoundman Posted August 9, 2007 Share Posted August 9, 2007 The blades are stuck due to gooey oil. The front lens has to come out. Then you can clean the blades with Ronsonal and q-tips. It may take several cleanings to get it totally clean. Link to comment Share on other sites More sharing options...
luis triguez Posted August 10, 2007 Share Posted August 10, 2007 Chris, Download the free repair manual from Kyphoto of the Ql17, it souldn`t bee so different that the QL28. http://www.kyphoto.com/classics/repairmanuals.html Good luck! Link to comment Share on other sites More sharing options...
winfried_buechsenschuetz1 Posted August 10, 2007 Share Posted August 10, 2007 I am not sure but maybe the aperture of the Canonet goes to the selected value only when the shutter button is depressed. Cock the shutter, set the speed dial to B, and release the shutter with different aperture values. Link to comment Share on other sites More sharing options...
richard_luke1 Posted August 16, 2007 Share Posted August 16, 2007 In most Canonet cameras, the aperture and shutter were a single mechanism, with the shutter opening to the correct aperture and then closing. The vast, vast majority of old Canonet cameras have non-functioning shutters. The aperture/shutter was formed by either two or three blades (I think it as two) and formed variations of an asymmetrical, off-centre trapezium, but the results were pretty good. Link to comment Share on other sites More sharing options...
alfredo_pizzirani Posted January 20, 2013 Share Posted January 20, 2013 <p>This thread is long cold, but since I just had the same problem with a Canonet ql17, I thought I would post my experience.<br> The aperture blade get sticky because the lubricant with time becomes less fluid. Working them will solve the problem without dissassembling the camera. Specifically, what I did was to set the aperture to 1.7, fire the shutter, set to 16, fire the shutter again. Then repeat the entire procedure. The frame counter helped me keep track of how many times I repeated the procedure: two and a half rolls, or about 80 shots.</p> Link to comment Share on other sites More sharing options...
alfredo_pizzirani Posted January 20, 2013 Share Posted January 20, 2013 <p>Also, on the ql17, operating in manual mode, the aperture blades snap to the right aperture when the rewind lever is pulled and the shutter is cocked. In other words, they are already at the right aperture when the shutter release is depressed.<br> I do not know what is meant to happen in automatic mode - I am waiting to receive a battery in the mail :-)</p> Link to comment Share on other sites More sharing options...
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