QHYCCD

A big Apple for Christmas - M27 with T300 - Short exposures

A big Apple for Christmas - M27 with T300 - Short exposures
« on: December 24, 2017, 07:46:39 am »
Hi Qiu,
Hi all,

A well-known deepsky target, M27, for Christmas !

The captures are in fact earlier, last August 2017. 3 nights (...part of nights,
I remember that the clouds have shortened 2 of the 3).

Here I use my Orion Optics 300 mm F/D 5.3 with QHY5III 290 M for luminance
layer and a QHY5III 178 C for color layer. And as for my previous images, I use
short exposures technique (0.4 to 5 seconds) and manual sort out to have the
better possible result.

2 nights for luminance (26/08/2017 and 28_29/08/2017) plus half a night for color
27_27/08/2017). First night was good at the beginning but the 2 other nights were
only medium and reduced the resolution of the global image. It's a pity !


As a comparison, here is the reference image from Adam Block with a much bigger
telescope, 500 mm :

http://www.caelumobservatory.com/obs/m27.html
http://www.caelumobservatory.com/obs/m27metcalf.jpg

From the detectivity point of view (faintest stars) Adam's image is better.
From the resolution point of view, the 2 image are very close, Adam's image
is only a little bit better.   


SETUP :
---------
Newton Orion Optics 300 mm F/D 5.3, on EQ-6 Mount

Luminance layer:
------------------
QHYCCD QHY 174 M (cooled) no filter.
13915 x 0.4 second. Gain = 48.
(10159+10989) x 0.4 second. Gain = 45.
5601 x 1 second. Gain = 45.
Darks.

Color layer :
-----------------
QHYCCD QHY5III 178 C (uncooled) + Ir/UV cut.
934 x 5 seconds. Gain = 40.
Darks.

Manual sort out of RAW image.
Registration with DeepSkyStacker.
Post-processing with Iris + Photoshop.



A second version with more processing :



Albéric
« Last Edit: December 29, 2017, 03:54:10 am by xs_man »

Re: A big Apple for Christmas - M27 with T300 - Short exposures
« Reply #1 on: December 27, 2017, 06:45:59 pm »
That's pretty awesome!

Re: A big Apple for Christmas - M27 with T300 - Short exposures
« Reply #2 on: January 12, 2018, 01:30:20 pm »
Hi Qiu,
Hi all,

A well-known deepsky target, M27, for Christmas !

The captures are in fact earlier, last August 2017. 3 nights (...part of nights,
I remember that the clouds have shortened 2 of the 3).

Here I use my Orion Optics 300 mm F/D 5.3 with QHY5III 290 M for luminance
layer and a QHY5III 178 C for color layer. And as for my previous images, I use
short exposures technique (0.4 to 5 seconds) and manual sort out to have the
better possible result.

2 nights for luminance (26/08/2017 and 28_29/08/2017) plus half a night for color
27_27/08/2017). First night was good at the beginning but the 2 other nights were
only medium and reduced the resolution of the global image. It's a pity !


As a comparison, here is the reference image from Adam Block with a much bigger
telescope, 500 mm :

http://www.caelumobservatory.com/obs/m27.html
http://www.caelumobservatory.com/obs/m27metcalf.jpg

From the detectivity point of view (faintest stars) Adam's image is better.
From the resolution point of view, the 2 image are very close, Adam's image
is only a little bit better.   


SETUP :
---------
Newton Orion Optics 300 mm F/D 5.3, on EQ-6 Mount

Luminance layer:
------------------
QHYCCD QHY 174 M (cooled) no filter.
13915 x 0.4 second. Gain = 48.
(10159+10989) x 0.4 second. Gain = 45.
5601 x 1 second. Gain = 45.
Darks.

Color layer :
-----------------
QHYCCD QHY5III 178 C (uncooled) + Ir/UV cut.
934 x 5 seconds. Gain = 40.
Darks.

Manual sort out of RAW image.
Registration with DeepSkyStacker.
Post-processing with Iris + Photoshop.



A second version with more processing :



Albéric

A very good image of one of my favorite objects. I will revisit Winter with the QHY168C!