Medium format film question

Hi,

I was just wondering what kind of film people were using for astrophotography
work for medium format. I can shoot both 6x6 & 6x4.5 format. I've used Fuji
Superia 800 print film in the past but just wondering if there was something
better that people liked. Thanks for the info.

Ralph
41 16N 75 50W

I think Kodak Ektachrome E200 is available in medium format, isn't it?

Almost no reciprocity failure, and a strong response to hydrogen-alpha.

And in medium format, the grain is not going to be a problem at all.

"Michael A. Covington" wrote
in message ...
I think Kodak Ektachrome E200 is available in medium format, isn't it?

Almost no reciprocity failure, and a strong response to hydrogen-alpha.

And in medium format, the grain is not going to be a problem at all.

Isn't field curvature a problem across such a wide field?

RalphMW wrote:

Hi,

I was just wondering what kind of film people were using for astrophotography
work for medium format. I can shoot both 6x6 & 6x4.5 format. I've used Fuji
Superia 800 print film in the past but just wondering if there was something
better that people liked. Thanks for the info.

Ralph
41 16N 75 50W



Hi Ralph,

Check the archives of the APML (astro photo mail list) at:

http://astro.umsystem.edu/apml/

As soon as Koda finds out a film is good for astro work they change it
to make it not so. I''ve talked to Kodak people way up the food chain
and they could care less about astro-people. The problem is H-alpha
sensitivity is not what the human eye is sensitive to so if a film is
sensitive to it then the images don't look 'natural'. A little to red.
Now they probably sell 100,000 rolls of film for portrait work for
every one of astro.

As mentioned the E-200 / EktaChrome is good. Some of the Fuji 100
Provia pushed 1 F stop is good as is the Provia 400. The ultimate film
is hypered Tech Pan (B&W).

Field Curvature is not a problem with a good field flattner. My TMB-152
/ Pentax 6x7-II and field Flattner does a great job. I have a lot more
to learn in techniques however! Some of my pics at:

http://tim.povlick.com


Kodak also has a CCD back for 6x5. :-)


Good Luck!

Tim


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