Post by jolasa on Sept 25, 2013 7:20:33 GMT -5
Regarding imaging with my Asteria 150 TCR R35.
As we all know, as a rule of thumb, the guidescope should have about as long a focal length as the telescope you are photographing through.
The Asteria 150 F12 has a focal length of 1800 mm - this means a HUGE guide scope.
For some images I took when I first got the Asteria 150 back in July 2013, I used a 50 mm f3.2 (focal length=162mm) guidescope, and the images were pretty good. This mini guide scope is advertised to work with scopes up to 1500mm focal length.
I also have an 80mm f5 scope (focal length=400mm) I could use.
But, to improve things, I am thinking of trying OAG (off-axis guiding) - a small pickoff prism in the main scope light path diverts star images to the guide camera. This would mean the main scope and the guide scope are essentially the same. I am aware of potential problems finding suitable guide stars.
Anybody have experience imaging with the Istar large aperture, high f-ratio scopes?
What quide scope and other equipment do you use?
JonS
As we all know, as a rule of thumb, the guidescope should have about as long a focal length as the telescope you are photographing through.
The Asteria 150 F12 has a focal length of 1800 mm - this means a HUGE guide scope.
For some images I took when I first got the Asteria 150 back in July 2013, I used a 50 mm f3.2 (focal length=162mm) guidescope, and the images were pretty good. This mini guide scope is advertised to work with scopes up to 1500mm focal length.
I also have an 80mm f5 scope (focal length=400mm) I could use.
But, to improve things, I am thinking of trying OAG (off-axis guiding) - a small pickoff prism in the main scope light path diverts star images to the guide camera. This would mean the main scope and the guide scope are essentially the same. I am aware of potential problems finding suitable guide stars.
Anybody have experience imaging with the Istar large aperture, high f-ratio scopes?
What quide scope and other equipment do you use?
JonS
