Re: [APML] 2 new images

[Jerry Lodriguss <jerryapml@astropix.com>]

Hi Wei-Hao,

These are some very nice shots. The Centuria 800 looks great, at least at 
web resolution. The color sensitivity is great too. Do you find the 
Centuria 400 to be pretty much the same?  How would you compare it to E200?

How did you measure the star diameters?

Jerry



>Centuria 800 is quite grainy, comparing to Centuria 400.  Of course,
>one hour at F9.4 is too under exposed.  This is part of the reason why
>it's grainy.  Although I stacked three images, the stacked image still
>looks grainy, and noisy.  Surprisingly, stars are extremely sharp and
>have well-defined shape.  (Centuria 400 also produces very sharp stars.)
>The finest stars on the film have diameters about 40 micron, as small
>as I measured on E100S.  Unfortunately, I have to do some smoothing in
>PhotoShop to remove the grains.  This slightly demaged the resolution
>of the image.  I may take 3 or 4 more 1-hr exposures next year to
>improve the S/N so I don't need to smooth the grains and can keep the
>very sharp stars.

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