Film advance and slippage in 501CM Blad

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peter lang - 29 Oct 2003 01:27 GMT

Hi Group,

Has anyone experienced film slippage problems with 501CM's with an A12
back? Should there be a difference between advancing the film with the
crank lever and just the film advance knob?

When using the crank lever, the framing is approx 8mm gap between shots.
This is equal on every frame. When advancing with the knob,(say with two
turns) the gap can vary between 8 and 12-15mm.

I'm shooting with Tri-X and FP4 which are both thick and thin based
films, but this should not make a difference, or does it?

thanks,
peter

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Q.G. de Bakker - 29 Oct 2003 15:41 GMT

> Has anyone experienced film slippage problems with 501CM's with an A12
> back? Should there be a difference between advancing the film with the
> crank lever and just the film advance knob?

No.

> When using the crank lever, the framing is approx 8mm gap between shots.
> This is equal on every frame. When advancing with the knob,(say with two
> turns) the gap can vary between 8 and 12-15mm.

As long as you get 12 frames on a roll, and they don't touch or even
overlap, i wouldn't worry. Keep using the back and have it serviced when a
regular service is planned anyway, or whenever it is most convenient.

> I'm shooting with Tri-X and FP4 which are both thick and thin based
> films, but this should not make a difference, or does it?

A bit, yes. That is, the wind mechanism is preset, and this preset is
calibrated to "normal" film thickness. Spacing will vary when "abnormally"
thick/thin films are used. But i think all films currently available are
within tolerances, enough to give good spacing (= 12 shots fit on a roll,
and the frames don't touch or overlap).
However, this is a matter quite separate from the wind vs crank issue.

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