I have been trying to search for an answer on the forums but after couple of hours of research I decided I would rather attempt asking my specific question here.
I own Skywatcher ED80/600 (f7.5) and EQM35, 2x GSO ED Barlow and mirrorless Sony A6000.
I have recently developed an interest in astrophotography and I have been successful (read satisfied) in making a few beginner photos of Andromeda, Pleiades, Neowise (still far from great, but I got that heartbeat skip when I got some of my end results), so that is good enough for me for now. Now, being cloudy for almost a month I am eager to continue as soon as the sky clears. My next target is the conjunction of Jupiter and Saturn in December. (I will be in a dark area in the days of the biggest proximity)
Obviously I never took a closer shot at planets previously, so I am having few thoughts (perhaps completely incorrect) on how to achieve this.
I run a simulation in Stellarium. The approximate results of how I imagine the result to be, requires 6x Barlow magnification equivalent. Stacking 2x and 3x onto the scope apparently should give the effect of 6x Barlow. Obviously that introduces the problem the light/brightness loss, which will force me to use longer shutter speeds. And to make things even more complicated I read that you need to shoot video and then stack the images from the video to get more details on the planets.
So my questions coming out of this reasoning:
1. Is it realistic to use 2 stacked Barlows (2x and 3x)? Has someone tried it? (reason for asking is whether I should go through the effort of obtaining/barrowing one or just ditch the whole idea)
2. If yes, will I be able to achieve focus behind the stacked Barlows without an excessive length of extenders? (if I will need an extender is there a way to calculate the length?)
3. Am I correct in my assumptions that I would need to shoot video and then use identify sharp frames from the video for stacking?
Thanks for all the help.
Edited by jborko, 30 November 2020 - 09:01 AM.