#1
|
|||
|
|||
ASTRO: M51 at f/10
I had a mostly clear night on March 23, but with a bright, almost full moon
I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan |
#2
|
|||
|
|||
ASTRO: M51 at f/10
That is a good shot Stefan! nice.
Cann't wait for the 10" RCX400 imaging this one...(with the f/8 system..). reg Dirk "Stefan Lilge" wrote in message ... I had a mostly clear night on March 23, but with a bright, almost full moon I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan |
#3
|
|||
|
|||
ASTRO: M51 at f/10
up close and personal: wow!
"Stefan Lilge" wrote in message ... I had a mostly clear night on March 23, but with a bright, almost full moon I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan |
#4
|
|||
|
|||
ASTRO: M51 at f/10
Wow! nice and sharp. Any color data planned??
Joe "Stefan Lilge" wrote in message ... I had a mostly clear night on March 23, but with a bright, almost full moon I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan |
#5
|
|||
|
|||
ASTRO: M51 at f/10
Stefan Lilge wrote: I had a mostly clear night on March 23, but with a bright, almost full moon I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan You do need a lot more light at f/10 than f/5. Sometimes the mirror lock arrives with unmeshed gears. That happened to me. I turned and turnd the knob but nothing happened. When it is working it eventually gets tight and a slip clutch releases sounding much like the one on a car gasoline filler cap (at least one over here). If you aren't getting that the mirror may not be locked. At least that's how mine works. Image looks good in spite of the problem. Rick 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". |
#6
|
|||
|
|||
ASTRO: M51 at f/10
Great job Stefan!
Stefan Lilge wrote: I had a mostly clear night on March 23, but with a bright, almost full moon I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
#7
|
|||
|
|||
ASTRO: M51 at f/10
"Stefan Lilge" wrote .... ........... Even on a bright target like M51 I did not get good signal in three hours...... Looks good to me Stefan! I wish I could get seeing like that, but not here under the jet stream nearly all of the time. George N |
#8
|
|||
|
|||
ASTRO: M51 at f/10
Thanks George. Actually you got similar detail in your recent M51 shot
(which I just saw at "spacebanter.com", didn't make my newsserver) in just a few minutes. Stefan "George Normandin" schrieb im Newsbeitrag ... "Stefan Lilge" wrote ... ........... Even on a bright target like M51 I did not get good signal in three hours...... Looks good to me Stefan! I wish I could get seeing like that, but not here under the jet stream nearly all of the time. George N |
#9
|
|||
|
|||
ASTRO: M51 at f/10
Hey Stefan.. Nice job at the long FL... Hope you get us some more close
views! -- Regards, Doug W. www.photonsfate.com "Stefan Lilge" wrote in message ... I had a mostly clear night on March 23, but with a bright, almost full moon I did not want to do any "serious" imaging and decided to try my 10" Meade ACF (formerly known as ARC ;-) scope without a focal reducer. Even on a bright target like M51 I did not get good signal in three hours. Actually the image does not have better detail than my best shot with an 8" SCT at f/6.3, but I still consider this image to be a success for the ACF scope as I needed several tries with the 8" to get what I got with the 10" on the first try. This is also the first time I have used the mirror lock and guided with a seperate guidescope. This was only half of a success as I had a shift of about 2 pixels between frames, which led to some elongation of stars in RA. I resized the image to 78% to make it look sharper and get rid of some noise. Taken from the middle of Berlin with a 10" Meade ARC at f/10 on a G11 mount, SXV-H9 camera, 35x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/M51F10-35x5smallgut.jpg Stefan |
#10
|
|||
|
|||
ASTRO: M51 at f/10
"Stefan Lilge" wrote ... Thanks George. Actually you got similar detail in your recent M51 shot (which I just saw at "spacebanter.com", didn't make my newsserver) in just a few minutes. Stefan, With our poor seeing the only advantage we have from a 20 is the reduced exposure time. However, the seeing was not too good even for our standards the night I did M-51. George N |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | May 3rd 07 01:08 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | Astronomy Misc | 0 | May 3rd 06 12:33 PM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | May 3rd 06 12:33 PM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | October 6th 05 02:34 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | September 30th 04 02:23 AM |