First proper test of the DS40 with the ERF removed from the primary etalon. This has resulted in image brightness roughly twice what i was getting before, allowing more magnfication at the eyepeice and roughly a halving of exposure time with the CCD. Next step is to calibrate the alignment of the TMax tuning unit - I have made a gasket to assist with this and this should offer an improvement in even field illumination. A reasonably quiet sun was visible on sunday, but made for a nice frame either way.
