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ASTRO: Comet Holmes (12-12-07)



 
 
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  #1  
Old December 13th 07, 04:33 PM posted to alt.binaries.pictures.astro
J McBride
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Posts: 274
Default ASTRO: Comet Holmes (12-12-07)

Here is Comet Holmes update from last night. I used a 200mm Olympus lens
with my modified 400D. Total time is 12 minutes. I got a new monitor and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe





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  #2  
Old December 13th 07, 05:37 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: Comet Holmes (12-12-07)



J McBride wrote:
Here is Comet Holmes update from last night. I used a 200mm Olympus lens
with my modified 400D. Total time is 12 minutes. I got a new monitor and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe

Stars seem too red though the comet doesn't. I still keep a CRT for
image processing. I see into the extreme dark and light regions better
with them. Though my flat screens are several years old and today's may
be better.

You picked up NGC 1245 at the lower right of the comet. I tried to get
a shot of it with the 14" through a sucker hole but it closed before I
got the green and blue data. Tried again for those colors another night
but saved them in a wrong directory. Just haven't found where as yet.
Also the sucker hole closed on the blue frame so it is only half
intensity of the others and foggy looking. So I still need to redo
that. Anyway that open cluster is about half my fov so the comet is way
too big for me any more!

By day it has been fairly clear but by night clouds roll in. I have now
a half dozen objects with some data as I go from one to the other as the
sucker holes move around. Get 10 minutes of this and 20 of that. Not
enough for any one as yet I don't think. At least not that doesn't have
a lot of cloud fog in it. Way cloudier than normal this year. Nothing
for three darks of the moon now.

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".

  #3  
Old December 13th 07, 06:42 PM posted to alt.binaries.pictures.astro
J McBride
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Posts: 274
Default ASTRO: Comet Holmes (12-12-07)

The star colors is due to the 200mm lens. I shot through wide open. I
should have stopped down 1 or 2 stops. I never noticed it with film.
Someday I'll up grade the lenses.

Joe


"Rick Johnson" wrote in message
...


J McBride wrote:
Here is Comet Holmes update from last night. I used a 200mm Olympus

lens
with my modified 400D. Total time is 12 minutes. I got a new monitor

and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe

Stars seem too red though the comet doesn't. I still keep a CRT for
image processing. I see into the extreme dark and light regions better
with them. Though my flat screens are several years old and today's may
be better.

You picked up NGC 1245 at the lower right of the comet. I tried to get
a shot of it with the 14" through a sucker hole but it closed before I
got the green and blue data. Tried again for those colors another night
but saved them in a wrong directory. Just haven't found where as yet.
Also the sucker hole closed on the blue frame so it is only half
intensity of the others and foggy looking. So I still need to redo
that. Anyway that open cluster is about half my fov so the comet is way
too big for me any more!

By day it has been fairly clear but by night clouds roll in. I have now
a half dozen objects with some data as I go from one to the other as the
sucker holes move around. Get 10 minutes of this and 20 of that. Not
enough for any one as yet I don't think. At least not that doesn't have
a lot of cloud fog in it. Way cloudier than normal this year. Nothing
for three darks of the moon now.

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".



  #4  
Old December 13th 07, 06:52 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Comet Holmes (12-12-07)



J McBride wrote:
The star colors is due to the 200mm lens. I shot through wide open. I
should have stopped down 1 or 2 stops. I never noticed it with film.
Someday I'll up grade the lenses.

Joe


Does your mod have any IR cut off. If none that would explain it easily
though even the deeper IR cutoff filter might be too deep for those lenses.

In my 2415 days, when I used lumicon's deep red "H-alpha" filter it
would require refocusing the lens as it passed too much IR for it's
correction. Not being able to see IR I had to find the focus by trial
and error. Wasted a lot of 2415 before I nailed it. Things are so much
easier today! Immediate results, no nasty chemicals or wasted film.
And no hive covered, discolored, smelly fingers.

Looks like no Geminids tonight, it's snowing.

Rick

  #5  
Old December 13th 07, 07:02 PM posted to alt.binaries.pictures.astro
J McBride
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Posts: 274
Default ASTRO: Comet Holmes (12-12-07)

My 400D has the IR/UV replacement so I wouldn't have to play around with
filters.

Joe


"J McBride" wrote in message
...
Here is Comet Holmes update from last night. I used a 200mm Olympus lens
with my modified 400D. Total time is 12 minutes. I got a new monitor and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe






  #6  
Old December 13th 07, 07:07 PM posted to alt.binaries.pictures.astro
J McBride
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Posts: 274
Default ASTRO: Comet Holmes (12-12-07)

Chromatic Aberration is very apparent in these lenses when used with a
digital camera. The 100mm is ok but the 200mm and 300mm needs to be stopped
down.



"J McBride" wrote in message
...
Here is Comet Holmes update from last night. I used a 200mm Olympus lens
with my modified 400D. Total time is 12 minutes. I got a new monitor and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe






  #7  
Old December 13th 07, 07:11 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Comet Holmes (12-12-07)

Same as my old film lenses for the Exa I used. They had a very
different focus in the deep red that only 2415 saw very well. Normal
films didn't go that red so they didn't design the lens for that. But
stopping down didn't help much. The focus was just too far different.
Obviously I won't be try them on a CCD camera!
Rick

J McBride wrote:

Chromatic Aberration is very apparent in these lenses when used with a
digital camera. The 100mm is ok but the 200mm and 300mm needs to be stopped
down.



"J McBride" wrote in message
...

Here is Comet Holmes update from last night. I used a 200mm Olympus lens
with my modified 400D. Total time is 12 minutes. I got a new monitor and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe




  #8  
Old December 14th 07, 02:09 AM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
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Posts: 985
Default ASTRO: Comet Holmes (12-12-07)

the thing reminds me of the old "Cabbagehead" jelly fish I used to see in
the Gulf of Mexico when I was a boy...

here's a variety of them but this is not as clear as the ones in the Gulf
along the Texas coast.


http://audilab.bmed.mcgill.ca/~funne...yfish_crop.jpg


"J McBride" wrote in message
...
Here is Comet Holmes update from last night. I used a 200mm Olympus lens
with my modified 400D. Total time is 12 minutes. I got a new monitor and
so I am learning how to process with a flatscreen. I had a CRT before.

Joe






 




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