M27 The Dumbbell Nebula [2019.07.04] W.I.P v1

            This is a calibrated & integrated stack of very limited data, a new target for me and a work-in-progress. 

From my backyard I am unable to see Polaris so am unable to make a true PA and I rely on a North South line that I have marked on my patio & the use of an inclinometer to set my wedge mounted forked SCT at the correct angle for my latitude. 

I also have a very narrow view from my backyard and target need to be over 30° to be above rooflines to start with. 

PHD2 generally irons out a lot of my alignment discrepancies but I am pretty near to start with. 

It has taken me a long time, lots & lots of test shots over the last week or so in order to perfect my focal reducer to sensor spacing but I am glad that I have spent the time on it as the resulting stars are very good. 

Back to this image, I had just about 1 hour of reasonable dark left this morning to capture the data, LRGB, & set APT going with a plan to capture just 10 x 75s frames through each filter at my calculated Unity Gain of 180 & Offset of 25 for my QHY174M camera. 

Plus I had equipment issues, immediately that I switched the camera's cooling on all the stars turned ovoid, this is a new camera to me & with a little Googling I saw a few reports of fan vibration causing issues on QHY & ZWO cameras at the longer focal lengths, such as mine. 

Oh well, cooling was off then and the camera was imaging at 25°C. 

I am going to either put some vibration supression on the fan or replace it with a better version. 

In the end and being super fussy with the frames i.e. past Meridian I was slightly off balance, I junked a number of frames and ended up with as follows: 

Luminance 9 x 75s 
Red 3 x 75s 
Green 6 x 75s 
Blue 8 x 75s 

a grand total of just 32.5mins integration. 

All calibrated along with 25 Flats per channel with their matching Dark Flats & 25 Darks and integrated in APP. 

Combined also in APP with some post processing & final tweaking done in PS.

Taken on: July 4, 2019

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Camera: QHY 174M, f/6.3, 1950 sec, 1492mm, ISO 180 (more info) (hide info)

Camera:	QHY 174M
Aperture:	f/6.3
Exposure Time:	1950
Focal Length:	1492mm
ISO:	180
Color Space:	sRGB
Software:	APT, APP, PS CC2018, EXIFTOOL, GEOSETTER
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