Canon IVsb with Pinhole in Shutter Curtain

raid

raid

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I need to locate the pinhole in the shutter curtain of the Canon IVsb. The camera is a bottom loader so I cannot open the back of the camera. I removed the lens and took a light pointed at the shutter curtain. I stared at the curtain over and over while cocking the shutter and firing it to see the curtain travel. Is there a way to figure out the exact location of the pin hole? With a camera having an open back, I can see how to use a light to find the hole, but with a bottom loading camera I am lost here.
 
The other obvious alternative is to replace the shutter curtain. Does anyone here have experience with such a repair? Is it very costly?
 
maybe try to bring it in to a dark room and shine a light into its open bottom end and look in the lens mount and see if you can see a spot of light...
 
Raid,

take some pics, preferably without lens and figure from the negatives where to pinhole could be. It is tricky.
Is the curtain wrinkled? Then just replace it.
If it just has holes I would recommend liquid plumber tape for repair, just be careful.

Ciao

Joerg
 
Does the pinhole leave a dark spot on negatives? If yes, then just take the negative and rotate it so it's upside down. The dark spot will indicate where the curtain is damaged. Paint a little fabric paint on this spot on both curtains.
 
Hi Raid - I have the same problem with my IV-Sb!

eg http://www.rangefinderforum.com/photopost/showphoto.php?photo=15896&cat=500&ppuser=1665

I've tried painting the shutter fabric with matt black flexible fabric paint, but it has not worked completely. My next step will be to remove the body so I can get a strong light to the back of the shutter, and locate the hole properly, then use Liquid Electrical Tape (or Goop) to patch the hole. If that doesn't work, it will have to go for a new shutter curtain. Good luck!
 
Raid, if it were me, I'd put in a new roll of film and make sure the lens cap is on. I'd advance the film to an unexposed section and then I'd take a picture of anything for reference.

Then replace the lens cap, advance the film and release the shutter while the cap is still on the lens. Open the lens aperture wide and remove the cap for a few seconds to expose the shutter curtain (this will be the second curtain) to the light. Replace the lens cap on the lens.

Now advance the film again and remove the lens cap to expose the first shutter to the light.

Put the lens cap back on the lens and fire the shutter. Rewind the film and have it processed. The negatives will tell you which curtain and exactly where the leak is.

Walker
 
doubs43 said:
Raid, if it were me, I'd put in a new roll of film and make sure the lens cap is on. I'd advance the film to an unexposed section and then I'd take a picture of anything for reference.

Then replace the lens cap, advance the film and release the shutter while the cap is still on the lens. Open the lens aperture wide and remove the cap for a few seconds to expose the shutter curtain (this will be the second curtain) to the light. Replace the lens cap on the lens.

Now advance the film again and remove the lens cap to expose the first shutter to the light.

Put the lens cap back on the lens and fire the shutter. Rewind the film and have it processed. The negatives will tell you which curtain and exactly where the leak is.

Walker
Click to expand...

Walker: Your suggestion sounds as if it would allow me to have a good chance to find the pinhole. Thanks for the tip. I will ty this method out first.
 
ChrisN said:
Hi Raid - I have the same problem with my IV-Sb!

eg http://www.rangefinderforum.com/photopost/showphoto.php?photo=15896&cat=500&ppuser=1665

I've tried painting the shutter fabric with matt black flexible fabric paint, but it has not worked completely. My next step will be to remove the body so I can get a strong light to the back of the shutter, and locate the hole properly, then use Liquid Electrical Tape (or Goop) to patch the hole. If that doesn't work, it will have to go for a new shutter curtain. Good luck!
Click to expand...

Chris: How did you locate the pinhole in the shutter curtain for your IVsb?
 
Argh! How do you hold the camera vertically? Or maybe find a horizontal picture. My IIF had an overall leaky first curtain, so bad I couldn't change lenses in daylight. I painted it with Liquitex Mars Black, two thin coats. It's fine now. Looking at it, you can't see that it's been painted at all. The liquid electrical tape is probably better than paint for pinholes, based on my bellows repair experience.
 
raid amin said:
The other obvious alternative is to replace the shutter curtain. Does anyone here have experience with such a repair? Is it very costly?
Click to expand...

I had DAG replace my IVsb currtain a few weeks ago. I recall Don telling me that the curtains used come from Leica stock and cost about $35. Whether it can be DIY, I don't know. That repair and CLA c ost me $210, and I am a very satisfied customer...
Subhash
 
VictorM. said:
Argh! How do you hold the camera vertically? Or maybe find a horizontal picture. My IIF had an overall leaky first curtain, so bad I couldn't change lenses in daylight. I painted it with Liquitex Mars Black, two thin coats. It's fine now. Looking at it, you can't see that it's been painted at all. The liquid electrical tape is probably better than paint for pinholes, based on my bellows repair experience.
Click to expand...

Victor: Where can I get Liquitex Mars Black? This is then liquid electrical tape? So you recommend painting over the shutter curtain ... all over? Would I paint a piece and then wait until the coating dries, and then advance the shutter curtain?
 
Lquitex is acrylic paint. I used 'Mars Black' because the label said it's opaque. The scan (stupid digi camera won't recognize the memory card-my Leica IIIf never failed to recognize Tri-X) shows the 'Heavy Body' type, but I found it too thick. Regular is better. It can be found at art supply stores. I painted it on with a slightly stiff, small brush, working it into the weave of the fabric, carefully. I let it dry overnight before applying a second thin coat. I let that dry for at least a day before I operated the shutter. The paint is used on fabrics so it stays flexible when dry. Liquid electrical tape is another substance entirely. It can be found at auto supply stores.
 

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back alley said:
speaking of a new shutter curtain, chris, did you ever get the canon p back? the one with the replaced cloth curtain?
joe
Click to expand...

No, and I've already paid for it too. I hope that wasn't a mistake. I guess Mr Hama is having more trouble with it than he anticipated, or is backed up with jobs. I'd better get up early and give him another phone call. Gets expensive, chasing up people who make promises.
 
raid amin said:
Chris: How did you locate the pinhole in the shutter curtain for your IVsb?
Click to expand...

That's the problem - I didn't locate the hole, just painted the entire shutter curtain with the black fabric paint. First I did the first curtain, let that dry properly, then did the second curtain. Repeated the whole process twice, too! I would have expected that to fill any holes, but apparently they are still there.
 
ChrisN said:
No, and I've already paid for it too. I hope that wasn't a mistake. I guess Mr Hama is having more trouble with it than he anticipated, or is backed up with jobs. I'd better get up early and give him another phone call. Gets expensive, chasing up people who make promises.
Click to expand...


not too good eh?
damn good thing you have other cameras to use.

joe
 
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