Anthony Atkielski wrote:
> Arthur writes:
>
>
>>The dust, or defect is above the jet streak
>>at the very top of the image. It is a gray
>>smudge, which seems to be dust or a defect in the
>>slide.
>>
>
> So there is. You must have spent a lot of time examining the sky. Remind
> me to shoot only on days with scattered clouds henceforth.
>
A blue sky is indeed the ultimate test of most filmscanners. YOu can
see if their is posterization, noise, dust, etc, and the blue channel is
usually the hardest one on a CCD it seems.
>
>>Well, you may still be able to reduce the
>>pressure on the film by placing a thin border
>>material around the edges, as an example.
>>
>
> There is a spacer included with the holder, but I haven't figured out how or
> if I should use it with 3-exposure strips of 6x6. Also, there is only one
> such spacer, and it looks very fragile, and knowing Nikon, additional
> spacers probably cost $240 each. The manual says that the spacer is for use
> when there are less than three exposures on the strip.
>
>
Who cares what Nikon gave you. Make up one with some black card stock,
or some black plastic sheeting and a mat cutting blade. You just need
something that creates enough of a space between the glass and the film
surfaces to remove the Newton ring interference patterns. Heck,
Anthony, get wild and make your own! It will cost you about 25 cents
(or a half a franc or so)!
>>Yes, I am aware of that. I was suggesting
>>that your "hurricane blasts of wind" might
>>cause dampness if the air wasn't dry ...
>>
>
> I use canned air, so it should be dry and dust-free.
>
Canned "air" creates dampness especially when used in large volumes as
it condenses moisture out of the air and creates ice crystals due to the
change of state it goes through, which is an endothermic action. If the
room air is humid to begin with, canned air can cause problems with
moisture. Also, Canned "air: is actually a propellant and not
particularly good for either one's health of the environment. Not my
favorite method. A cheaper and maybe better alternative is just a
rubber ball syringe.
>
>>I was suggesting that since the dust can be
>>handled via dICE, that it might be detrimental
>>to over clean the film with air, because it
>>may make it more apt to show Newton rings.
>>
>
> Well, this scan had dICE turned on, and you still saw dust (or something) on
> the transparency.
I'm not sure what that gray smudge is, It might be an emulsion defect
or maybe even a large enough piece of crud that that was the best dICE
could do to repair it.
Art
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