C-11 from F/10 to F/6.5 with a Lumicon Focal Reducer

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apilato

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Oct 6, 2013, 10:00:32 AM10/6/13

to astro...@seds.org

Good morning,

I have been switching from my C-11 from F/10 to F/6.5 with a Lumicon Focal Reducer and back and forth for film astrophotography. I am currently using Hypered Tech Pan and Fuji 200 color film. An advantage at F/10 is a 35% bigger image but a 2 hour exposure and a limited time window. Exposure at my site for F/6.5 is 90 minutes. More flexibility, shorter exposure time, but 35% smaller image.

Any input or recommendations? How critical is image size (in your opinion) when posting images for the web only?

Thanks,

Tony
Pilato
api...@chatmosscable.com
www.darkstarimages.com
Brosville, VA.
Latitude 36° 36' 31",
Longitude 79° 37' 02"

Jon Kolb

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Oct 7, 2013, 7:11:03 AM10/7/13

to apilato, astro...@seds.org

I would accept the extra 30 minutes of exposure time to get a larger and likely sharper image.

Jon

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