Thanks, Ed. I had looked. There are so many it was confusing which was good, better or best. Price ranges were enormous. I was interested in what others on the list thought of particular configurations they had used over the years. I’ll look more closely at the Opal glass configuration, now. Dave
On Sep 25, 2015, at 14:28, Ed <utnatsedj1@xmission.com> wrote:
Dave,
I trust you have googled a phrase like 'flat field light box' which yields a wide range of home-made versions.
Rather than a white reflecting surface, you might consider white Opal glass acting as a diffuser of transmitted light.
I gather the intent is to provide a uniform light intensity coming from all portions of the surface seen by the telescope. If that is correct, how uniform must if be? Within a 1/3 f/stop variation or more uniform than that?
Ed Stimpson
---------------------------- Quoting Dave Gary <davegary@me.com>:
For those that image?what type of flat-field setup do you have? Did you purchase the setup or did you build your own flat-field box? What type of light source do you use? If anyone has instructions on how to build a simple flat-field light box any information (pictures would be nice) would be greatly appreciated. Make the descriptions simple. Something that someone who nearly failed shop class (really, I almost did) could understand. Failing that, give me all the technical low-down and I?ll get the wife to help me out so that it actually works when the project is completed.
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