ASTRO: M3

Globular cluster M3 taken on 10 April 2010 from a farm just south of
Blueknob state park, PA. TOA150 at F/7.3. STL11000M, 4x10 min Lum,
1x10 min RGB. Cropped but not reduced.

"Robert Price" wrote in message
...
Globular cluster M3 taken on 10 April 2010 from a farm just south of
Blueknob state park, PA. TOA150 at F/7.3. STL11000M, 4x10 min Lum,
1x10 min RGB. Cropped but not reduced.

Very nice, Robert.

George

On 4/12/2010 10:45 PM, Robert Price wrote:
Globular cluster M3 taken on 10 April 2010 from a farm just south of
Blueknob state park, PA. TOA150 at F/7.3. STL11000M, 4x10 min Lum,
1x10 min RGB. Cropped but not reduced.


Looks a lot like my old film days image. Cutting down the length of the
L exposures will help preserve star color and reduce saturation of the core.

Better yet with such bright objects is to use pure RGB. Takes more time
but colors are better.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

Nice sharp stars Robert.
As Rick did point out, a series of 2 minute exposures would probabaly be
better for most globulars. The use a DDP filter and you have a nicely
resolved core.

Stefan

"Robert Price" schrieb im Newsbeitrag
...
Globular cluster M3 taken on 10 April 2010 from a farm just south of
Blueknob state park, PA. TOA150 at F/7.3. STL11000M, 4x10 min Lum,
1x10 min RGB. Cropped but not reduced.

I suspect that your stars are not saturated in the source data.

This is really a dynamic range compression problem

I think you can get pretty good results using curves in Photoshop

stretch the bright end up and the dark end down to make a rotated "S" curve
and I think you will have both the core resolved and the faint ones visible

looks like good source data but just needs a processing trick or two to get
the most from it


"Robert Price" wrote in message
...
Globular cluster M3 taken on 10 April 2010 from a farm just south of
Blueknob state park, PA. TOA150 at F/7.3. STL11000M, 4x10 min Lum,
1x10 min RGB. Cropped but not reduced.