 Donna Davia |
Shooting Velvia 50 at 40Iso using N65 How can shoot Velvia 50 at the recommended Iso using a N65? My camera lets me adjust exposure by 1/2 stops--which puts a ISO 50 down to 0. Could I try to photocopy the barcode from ISO 40 film to trick the camera? Is there even a film that is rated at ISO 40? I looked for a website that had the film barcodes on it but didn't find one.
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Peter K. Burian |
Donna: Does the N65 not have an ISO control? i.e. a feature that lets you change the ISO from 50 to 40? If not, then I cannot think of any way to fool the camera. A few years ago, some company was selling little bar code stickers that you could paste on a roll of film to trick cameras into setting a different ISO. (Cameras without an ISO selection feature.) Have not heard of those stickers recently. There is no ISO 40 film so you could not use that trick yourself. And even the company that marketed those may not have had an ISO 40 option. btw, if you set a -1/2 (-0.5) exposure compensation (with ISO 50 film), it will not be zero ISO. It will be ISO 37.5 which may be close enough. Try it. (ISO 50 film exposed at -1 = ISO 25. Cheers! Peter Burian
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Jon Close |
The N65 can only read ISO from the film can's DX code. It cannot be set manually. Picking nits, rating Velvia 50 at ISO 40 is +1/3 stop exposure compensation. +1/2 (+0.5, not -1/2 or -0.5) stop of exposure compensation is ISO 35.36 rather than 37.5 (ISO is a geometric scale rather than linear). Still using +1/2 compensation is close enough to ISO 40 for all practical purposes. It's only 1/6 stop different.
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Peter K. Burian |
Jon: Of course, you're right. A PLUS 1/2 stop (+0.5) exposure compensation, not minus. (I wrote that too early in the morning.) Cheers! Peter Burian
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Donna Davia |
Thanks to both of you for these ideas. I will try them out and see how it looks. I thought of another solution but the math in the tables I found made my brain hurt--what if I used a filter that allows, say 80% of the light to reach the film? All the filters I found gave percentages of light they let through--any more thoughts?
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Peter K. Burian |
Donna: No, using a filter would not work for the effect that you want. You must use exposure compensation to slightly over expose the film. If you use a filter, the camera's light meter compensates for the loss of light so the actual ISO remains at ISO 50. (Besides, if the filter trick worked it would UNDER expose Velvia; you actually want to OVER expose it a bit, as Jon pointed out.) Cheers! Peter Burian
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