Shutter drum differences IIIf rd v bd

[colyn]

Comparing the main shutter drum from a IIIf rd and one from the IIIf bd the difference I see is the pulleys are of the same diameter but are a bit thinner so I was wondering if anybody knows whether the main drum from a IIIf rd can also be used in a IIIf bd??

[xayraa33]

the rd shutter drum had ball bearings, the bd drum did not.
this might, pardon the pun, have a bearing on interchanging them.

[colyn]

the rd shutter drum had ball bearings, the bd drum did not.
this might, pardon the pun, have a bearing on interchanging them.

Upon closer inspection I see the squared off end of the shaft is slightly different which in effect makes the end shaft slight longer in the rd version.

[Xmas]

http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00EcX4

I thought all post war IIIc and on should have balls, as this above post seems to confirm, but the early source camera may be a conversion and I dont know if they would have replaced the plain bushes, or this is the Rd/Bd difference also quoted in the post.

Noel

[colyn]

http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00EcX4

I thought all post war IIIc and on should have balls, as this above post seems to confirm, but the early source camera may be a conversion and I dont know if they would have replaced the plain bushes, or this is the Rd/Bd difference also quoted in the post.

Noel

The IIIc and IIIf had ballbearings in the sprocket shaft and closing curtain cam. They were later added to the bottom shaft of the main shutter drum..

[Xmas]

Colyn

Thanks, so is this the Rd/Bd difference quoted in the pnet thread?

Noel

[colyn]

Colyn

Thanks, so is this the Rd/Bd difference quoted in the pnet thread?

Noel

In addition to the bearings the take-up rollers have been modified so as to be lighter than the original design as has the main shutter drum..

[Xmas]

Colyn

Thanks again, so the later shutters accelerate faster.

Noel

[colyn]

By lightening the main shutter drum and take-up rollers Leitz was able to slightly increase shutter velocity.

[Xmas]

Colyn

Thanks I was never impressed by the acceleration of my M2.

Noel

[colyn]

One of the reasons Leica used the slower shutter velocity was to increase shutter life. Higher velocity shutter such as used in the Japanese SLR's usually wore out faster due to the increased loads. The down side to slower shutter velocity is slower flash sync usually 50th or slower..

[xayraa33]

Leitz wanted a higher shutter speed for electronic flash to prevent ghosting and a more reliable 1/1000 of a sec.
so the red dial IIIf had faster curtain running time, hence the lighter drum and curtain rollers and ball bearings.

[sanmich]

Did anyone mention a very different shutter sound in the IIIc than in the IIIf bd?

My IIIc has a much louder and dinstinct shutter sound than my IIIf.

Maybe this has to do with the fact that the IIIf just came back CLA'd from DAG?

In that case, man, what a difference!!

[colyn]

Did anyone mention a very different shutter sound in the IIIc than in the IIIf bd?

My IIIc has a much louder and dinstinct shutter sound than my IIIf.

Maybe this has to do with the fact that the IIIf just came back CLA'd from DAG?

In that case, man, what a difference!!

What was the turnaround on the CLA?

[sanmich]

Colyn,

I can't remember exactly because the camera "waited" for my coming to the US...

A few weeks that's for sure. But if you are not in a rush, I cannot recommend Don enough. He is an excellent repair man and a very nice and helpfull person to deal with.

[colyn]

Colyn,

I can't remember exactly because the camera "waited" for my coming to the US...

A few weeks that's for sure. But if you are not in a rush, I cannot recommend Don enough. He is an excellent repair man and a very nice and helpfull person to deal with.

Thanks

I've dealt with Don before and found him to be a fine person to deal with but just recently sent him a M3 for curtain replacement and CLA and was wondering about the turnaround.