just cleaned it off for tomorrows session of the new active region, granted its not clouded out.
Yes, but can you put your coronado 60mm unit behind the 150mm istar currently??
You could do this with the 90mm collimator , and then modulate between full disc or high resolution just by altering the spacing. Switching out the etalon is very valuable considering the variability between them all. If its a poor sample you can trade it out for a better one without getting rid of the entire setup.
The upgrade here is modularity, adding the ability to go from a 20mm etalon to a 90mm etalon; is very unique piece of equipment. I currently switch out between the coronado pst etalon(200mm plane), and a lunt ls50c etalon.(500mm plane)
This telescope is also not limited to full disc imaging, i was evaluating the distance to fit a full disc onto my basler 1920-155um sensor. No barlow required. No reducer required. For high res work I use my basler aca720-500um which does 500 frames per second on larger pixels.
Peter: , id love to see your quarter disk images without flats, eyepieces typically will not show the sweet spot because it is vignetted by the 5mm blocking filter. When you upgrade to larger blocking filter's; This becomes very apparent with imaging wide fields.
Also note that running a 2x barlow, and pushing the focal lengh through a binoview greatly alters your F/ratio beyond 2x. Your magnification increases by 1.5x for every 50mm you extend past the optic.
Unfortunately You do still have a sweet spot, it is vignetted by the 5mm blocking filter; the reality is you are only using 7mm of your 20mm etalon. If you upgrade to a larger blocking filter - you will become immediately aware of this bottleneck.
We are all still limited by seeing despite how good our equipment is.