1741Re: DCL-52 & TV85
- Mar 1, 2003Thanks for the explanation Daniel now I understand, but I've just
managed to get my hands on an NP-101 which is already flatfield so
it's not much really an issue any more. Hopefully I'll have it by
next weekend - only problem is my mount isn't available for 2
months - cel la vie!
--- In William-Optics@yahoogroups.com, "danieldgj <danieldgj@y...>"
> The point is, no flattening is necessary for through-the-eyepiecethat
> photography. The field of a good refractor such as a TV85 is flat
> across the reltively small area of typical eyepiece fields, and
> is what your camera will see. If your eye sees pinpoint imagesyour
> through an eyepiece, so will your camera. If you can see pinpoint
> images across the eyepiece field visually but they're blurred in
> digital photos, then either you're out of focus or the cameraitself
> has optical aberrations. Field flattening is necessary only forvery-
> wide-field film photography, or for the use of very-wide-fieldscenario:
> eyepieces such as Al Nagler's biggest monsters. Worst case
> you'll have good images at the center, but a bit of blurring atthe
> edges. In practice, there are many other things that will be morethermal
> limiting to your digital photos with a Coolpix (vignetting,
> noise on long exposures unless the temperature is below freezing,aberrations
> etc.), and I suspect you'll find that the TV85 has fewer
> than your camera.<davetyrer@y...>"
> --- In William-Optics@yahoogroups.com, "davetyrer
> <davetyrer@y...> wrote:this
> > Hi Daniel
> > I expect the DCL-52 is the eyepiece you are talking about. see
> > links. Would this eyepiece help flatten the field then?
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