Re:... and Maco (On-T)

[Cor Breukel <cor@xxxxxxx>]

Joseph O'Neil wrote: (on MACO 4*5)

, but I did a series of shots ranging ffrom 4 seconds at F45
> to 1 minute at F45.  The 4 secodn figure is what value my spot meter gave
> me, and while the 1 minute was way overexpsoed, some of the 12 and 20
> second shots look not half bad, maybe event eh 20 secodn over exposed a wee
> bit.,

Joseph,

Using f45 will probably mean you are using sharpness due to diffraction,
an effect more prominent with longer wavelengths such as IR wavelengths,
theoreticly one should use f stops around f11-f16. Did not do a side by
side comparison myself though..

Cor
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