Details
TAL200k 1800mm f/9, Canon 5DH, no filter.
ISO 320 (8, 15, 30 ) sec, ISO 640 (30s, 1, 5x2, 18x4, 9x8) min. Converted from RAW to TIFF and corrected for flats with images plus. Aligned with Registar and generated an LDR from this data with EasyHDR.
The field is not as flat as it could be. I need to make a custom spacer for the Hutech FR/FF.
I have managed to work out the focus variation with temperature of the TAL200K and as luck would have it it is about one division on the helical focuser for every degree centigrade change in the tube temperature.
Large image 1.5MB
http://members.optusnet.com.au/~trlee8/carf.jpg
Bert