focal plane v diaphragm

John Koehrer said:

Flutot's has a chart showing speeds in ms.
Tolerance is +/- 30% above 125 & +/- 20% below.

"Drag" can be defined as slow. Both leaf or FP can be slow when old lubricants are present. Old lube can also cause erratic or inconsistent shutter speeds that may or may not be apparent to the nekkid eye or by examining the negative. The exception to this would be dramatic variations.

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Sirius Glass said:

Now we have to not just own the equipment, we have to maintain it too! What nerve!

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