Post by Deleted on Feb 3, 2019 4:03:29 GMT
Hello Carlos
There is not much science in what I do.
A few general rules that determine the stacks and exposures. I dont like to go over 3 minutes total exposure. I like to see what I can get in 1 minute. Anything longer than this and I figure I may as well be doing astrophotography which I dont have the patience for.
When using alt/az, 20 sec exposures is my limit and I try to get the exposures as short as possible that will give me an image that I am happy with. In the images I posted, 15 secs was as low as I could go with the 224 and the 290 and still be able to get an image.
I use sharpcap and when stacking it asks for a stack time where it will save automatically. The lowest is 1 minute and the next is 3 minutes. The 20 sec exposure for ngc1365 was better than 15 sec and 20sec x3 was ok but I only saved the 3 minute total.
I ramp up the gain until there is too much noise and then work backwards to an acceptable image
When using the EQ mounts, I will sometimes go to 5 minutes total maximum but try to avoid that long. I will certainly never go any more than 1 minute single exposure.
My aim is always to see if I can get to 10 second exposures.
A lot of people may think that is a dumb approach to videoastronomy and maybe that is why I only occasionally get a very pleasing image but that is how I want to do it.
I have recently got a RASA 8 and I am pretty certain it will be great for short exposures. It is sitting idle at the moment because I have broken my wrist and the scope is too heavy to be handling one arm. It has a small mirror tilt but otherwise is shaping up to be able to do what I need for videoastronomy..short exposures and few stacks as possible. I like these very fast scopes. I can use the 294 on the RASA but it is too big a sensor for the C6 hyperstar and I cant bring it to focus anyway.
The FOV according to astronomy tools for the 224 is .93 x.7 degrees and the 290 is 1.07x.6 degees. It will fit most objects I want to see
You have a lot more experience than me Carlos and I am interested in your comments
cheers
Paul
There is not much science in what I do.
A few general rules that determine the stacks and exposures. I dont like to go over 3 minutes total exposure. I like to see what I can get in 1 minute. Anything longer than this and I figure I may as well be doing astrophotography which I dont have the patience for.
When using alt/az, 20 sec exposures is my limit and I try to get the exposures as short as possible that will give me an image that I am happy with. In the images I posted, 15 secs was as low as I could go with the 224 and the 290 and still be able to get an image.
I use sharpcap and when stacking it asks for a stack time where it will save automatically. The lowest is 1 minute and the next is 3 minutes. The 20 sec exposure for ngc1365 was better than 15 sec and 20sec x3 was ok but I only saved the 3 minute total.
I ramp up the gain until there is too much noise and then work backwards to an acceptable image
When using the EQ mounts, I will sometimes go to 5 minutes total maximum but try to avoid that long. I will certainly never go any more than 1 minute single exposure.
My aim is always to see if I can get to 10 second exposures.
A lot of people may think that is a dumb approach to videoastronomy and maybe that is why I only occasionally get a very pleasing image but that is how I want to do it.
I have recently got a RASA 8 and I am pretty certain it will be great for short exposures. It is sitting idle at the moment because I have broken my wrist and the scope is too heavy to be handling one arm. It has a small mirror tilt but otherwise is shaping up to be able to do what I need for videoastronomy..short exposures and few stacks as possible. I like these very fast scopes. I can use the 294 on the RASA but it is too big a sensor for the C6 hyperstar and I cant bring it to focus anyway.
The FOV according to astronomy tools for the 224 is .93 x.7 degrees and the 290 is 1.07x.6 degees. It will fit most objects I want to see
You have a lot more experience than me Carlos and I am interested in your comments
cheers
Paul