William Optics GT71 with WO Field Flattener 6A2

Configuring a lightweight portable astrophotography imaging system

I use an assortment of telescopes, micro four thirds cameras as well as dedicated astrophotography CMOS cameras not to mention tracking mounts. With many different possible camera / telescope configurations, I find It important to document the imaging train setup of working systems for future reference.
 
The main dedicated astrophotography one shot colour camera I use is the ASI294MC Pro. When attached to the William Optics GT 71 there is considerable optical distortion on the periphery, ie the field is not flat. Fortunately William Optics sell an optional field flattener, the 6A2  to correct for this.

William Optics GT71 with 6A2 field flattener

William Optics Field Flattener 6A2

Attaching the ASI 294 MC Pro one shot colour CMOS camera to the William Optics adjustable field flattener 6A2 is simple using the two extension rings as supplied by ASI. The optional WO T- mount (or equivalent) is necessary to attach the camera and flattener to a telescope, in this case the William Optics GT 71. The field flattener is adjusted to 9.3mm as specified by William Optics.

Optical train - William Optics GT71 with 6A2 field flattener
Close up - William Optics GT71 with 6A2 field flattener

William Optics GT 71, Field Flattener 6A2 & ASI 294 MC Pro

A close up on the “business end” on the imaging system.

William Optics GT71 with 6A2 field flattener

M7 captured with William Optics GT 71, Field Flattener 6A2 & ASI 294 MC Pro

 

Swan Nebula captured with William Optics GT 71, Field Flattener 6A2 & ASI 294 MC Pro

 

Virgo galaxy region wide field, Canon FD 50mm f1.4 & ASI183MM Pro

All you need is some time and patience, a cloudless night, a $50 vintage lens, a simple tracking mount and a camera. Sounds simple enough but not always achievable. The biggest variable, the weather finally played ball last night so I had the change to try out some...

Markarian’s Chain William Optics GT71 & ASI183MM Pro

Markarian's Chain: William Optics GT71 and ASI183MM Pro Telescope: William Optics GT71 with  0.8 Field flattener 6A2 Camera: ASI183MM Pro Mount: Ioptron CEM40 Alignment: rough polar alignment using compass and level Guiding: ASIair (poor) Image: 102 * 60 sec subs...

First Light with the ASI183MM Pro & William Optics GT71 telescope

Fourth floor balcony astrophotography from my inner city Brisbane abode means I am restricted to imaging only the norther parts of the sky. M5 and M57 were perfectly positioned at around 8PM and the William Optics GT71 telescope & ASI183 mono camera were put to...

ASIair 12v-5v DC converter 3D printed adapter bracket

The ASIair is a small  Rapsperry Pi based mini computer with the computing power of an 1990's Pentium 3. Used in conjunction with Sky Safari Pro on an Ipad, its an ideal way to image and control a portable astrophotography setup such as my CEM40 mount and William...

Widefield astrophotography with the ASI294 MC Pro and Olympus 50mm OM lens

Lens: Olympus Om 50mm Camera: ASI294MC Pro Mount: SkyWatcher Alignment: none Guiding: none Image: 13 * 180 sec subs Gain: 300 Temp: 10 Deg C Processing: AstroPixel Processor - lights, only Bortle Class 1 site Location: Arckarula, South Australia Date: 17/5/2018...

PHD2 Guiding with Star Adventurer Mount

PHD2 Guiding a Star Adventurer Portable EQ Mount The SkyWatcher Star Adventurer is an excellent tracking mount when used for wide field astrophotography of the night sky allowing relatively long exposure image sequences without star trails. For those that want to...

William Optics GT71 with WO Field Flattener 6A2

Configuring a lightweight portable astrophotography imaging systemI use an assortment of telescopes, micro four thirds cameras as well as dedicated astrophotography CMOS cameras not to mention tracking mounts. With many different possible camera / telescope...

Planetary nebula astrophotography with William Optics GFT102 & ASI294MC Pro

My first serious attempt at imaging M57, the famous “Ring Nebula” with the Williams Optics GTF102mm f6.9 flat filed telescope, a  2X  Televue Powermate and a “one shot colour” astrophotography CCD camera in the imaging train.The planetary nebula was imaged from...

Astrophotography with the ASI294MC Pro one shot colour camera

NGC 253 "The Sculpture Galaxy " astrophotography with WO GT 71 Telescope William Optics GT 71 with Field Flattener 6A2 (effective focal ratio f4.7, FL = 336mm) Camera: ZWO ASI 294 MC Pro, Gain 400, Temp -10Deg. C Mount: Ioptron IEQ30 Alignment: PoleMaster Image:...

Octanslab – The Beginning

OctansLab - The beginningDiscover the treasures of the night sky and learn how to capture and process lunar, planetary, wide field and deep sky objects. OctansLab is based in  South East Queensland, Australia and images with a range of telescopes including a William...