Astrograph is an Officina Stellare RH200 which has a focal length of 600mm and is F3, yes F3! Clear aperture is 200mm.
FLI Atlas Focuser.
FLI ten position filter wheel CFW-3-10 with 50mm square filters.
Astrodon E series LRGB and HA, NII, SII and OIII 3nm NB filters. Also a continuum filter 5nm.
Camera is a FLI PL16803 which has a sensor size 36.8 X 36.8 mm.
The FoV of this system is 3.5 X 3.5 degrees.
Mount is a Software Bisque PMX.
Awsome field. There is so much clarity and detail in those filaments. Is it just me or you can see some hint of spiral structure/motion across the left of the field going up and wrapping around back down centered about the tarantula? The LMC is a barred spiral right? So that would spin clockwise from our point of view?
Having access to the FITS told me a lot. Indeed, I think both your focus and your guiding were not optimum during this capture. Your image scale is 1.79asp, while FWHM of on-axis stars was 4.5" - that's over double. Plus, most stars I measured were 20% out of round, indicating sub-optimum guiding.
That's looking pretty sweet there Wish i had your stuff.
At 600mm u should be able to do 10 min unguided images with the PMX, i know it can be done, as i've just spent a bit of time getting to that level myself at 530mm. Anyways keep them coming, always good to see your stuff.
I kind of expected the FITS header to be correctly configured, so when I opened the image and it reported 1.79", I took it for granted. When I looked at it again, none of the values were set.
So I adjusted the FITS header accordingly, and as you would expect, the result is very similar - on axis stars now reporting 7.5-8 arcsecs.
Having access to the FITS told me a lot. Indeed, I think both your focus and your guiding were not optimum during this capture. Your image scale is 1.79asp, while FWHM of on-axis stars was 4.5" - that's over double. Plus, most stars I measured were 20% out of round, indicating sub-optimum guiding.
HTH
Martin
Martin I think MaximDL put the guidescope parameters in after calibrating. My guidescope is a 100mm ED with a FL of 900mm and fitted with a Lodestar binned x2. The image scale is 3.1' per pixel for the RH200 and PL16803.
The guiding is fine less than 1' arc rms.
The star elongation you picked up is due to a slow incremental flexure of the dovetail that holds the main image train. See image below. The distance measured varies by about 100 micron from a vertical to horizontal position of the image train by rotation of the mount. The dial indicator was there to give me a lateral position of the OTS in the small lateral dovetail. I am going to get a far thicker one made by Luke Bellani. The weight of the optical train with the rather tall filter holder puts a large torsion on this dovetail plate.
This flexure is almost linear with exposure time. Not noticeable at 8 minutes exposure and to what you see at 16 minutes. It is far worse at 32 minutes. It is always in the direction of gravity! That tells me straight away it is flexure. It is only a problem when imaging nearer the SCP ie with the LMC and SMC.
I have done an exposure for 64 minutes with the optic vertical going through the zenith and the stars were perfectly round.
There is so much clarity and detail in those filaments. Is it just me or you can see some hint of spiral structure/motion across the left of the field going up and wrapping around back down centered about the tarantula? The LMC is a barred spiral right? So that would spin clockwise from our point of view? 
Wish i had your stuff.
