- Tony and All
I have uploaded 2 drawings of Sky90 in the Sky 90 file.
> KC,click on
> Thanks for the info. You can go to the home page for this list and
> files. Once you are on the page there is a link for posting imagesright to
> the groups files so anyone wanting to see can go there and look. Itwill even
> send a post to us telling us of the new post.to me
> If you have any trouble with this feel free to e-mail a jpeg image
> privately and I will post it for you.
> ANTHONY D. MILLER & Co.
> ~ The Tintype Artist ~
> Ambrotypes & Ferrotypes
> 34 Perryfalls Place
> Baltimore, Maryland 21236
- "Lawrence M. Geary" wrote:
> It isn't obvious to me why a color filter would change the focal position.The index of refraction is not exactly the same for each filter. The
difference is minor, but changing filters requires a slight tweak of
> If so, then I have a problem with my eclipse photography technique (QuestarFor this I wouldn't worry about it.
> 3.5"), because I focus on the sun using a filter, then of course remove it
> for totality.
1) You aren't dealing with point sources and if the focus is off 1/500" you
probably couldn't even notice the difference
2) I assume you are doing film photography. Since you are dealing with
a curved field anyway any focus shift is merely moving the ring
of perfect focus.