M-31.jpg

A nice picture. Please can you explain why all larger stars have spikes? I guess the CFF lenses have oil in between?
I had some years ago the CFF 165 , spikes were not in my raw data.
CS Reinhard

Thank to all for nice comments.
@Reinhard65: Hmmm, very hard question...as I said it is part of testing our new equipment setup. When we use CFF with no corrector on QSI690 camera (very small chip size) there is no spikes. But in use with HUGE 36x36 mm Moravian sensor and new TSFLAT3 corrector here they are. Maybe some optical combination that we don't fully understand, but for now I can not give you answer. Only can confirm that spikes are present also on raw data, not induced by stack or process image.

How many distance plates and position?
On the other side these spikes give a nice star expression.
CS Reinhard

We have best corrector version TSFLAT3 Colli which have option to change and adjust distance from lenses to chip. But problem could be maybe in slight tilt of whole system or small filter tilt which makes some diffraction effect? We will try to fix this effect in next sessions... or maybe it is even better with some subtle spikes