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Autofocuser recommendations for an Edge HD 8
The inability to achieve reliable precise focus when doing AP, whether it be deep sky or planetary has finally taken its toll on my last nerve.
80% of my scope time is spent imaging with a Celestron 8" Edge HD (with .7 reducer for deep sky) attached to a Losmandy G11 mounted to a permanent pier in a roll off roof observatory.
So I have come to the decision that its overdue for an autofocuser, preferably one that I can also control from my PC. I have read posts from users of Edge HD systems experiencing problems with backfocus in the image train when using crayford type systems like Moonlite etc. So I have primarily been looking at primary autofocusers like the ones from Rigel systems, (unb stepper) Robofocus and JMI.
Frankly there is so much info on the JMI page that it is difficult to see what is needed there, let alone calculate a cost. Plus the Rigel system and Robofocus do seem to fall more into my price range for a remote access system (inside my home).
So I am looking for advice, recommendations, warnings etc on either of the systems I have mentioned, plus if you know of another that works with this scope, I would love to hear that to.
There is the possibility that I may upgrade the 8 edge to an 11 edge sometime in the future, so a system with a conversion kit would be a great bonus.
But for now I just want a reliable precise way to autofocus via hc & pc.
Thanks for any advice you can give,
Deep sky imaging with a Newtonian?
Can someone explain the optical reason why deep-sky astrophography only seems possible with an SCT or Maksutov arrangement and not with Newtonians? I assume it has something to do with the relatively long focal lengths of those vs a Newtonian, but I'm sure that's simplistic. Thank you.
What's the longest exposure time I can expect with the Celestron NexStar 130SLT? Using a DSLR and the x2 barlow t-adapter?
I know it's not an ideal scope for astrophotography and I'm not expecting anything special since I know about EQ mounts etc. If it could get up to 30 second exposures I'd be happy.
Huge and blurry image using a webcam with primal focus
I'm an absolute beginner in webcam astrophotography. Based on various guides found on the net, I removed the optics from my old Creative LifeCam webcam, leaving the CMOS sensor only. With a self-made 1,25" adapter I attached the cam to the scope, aiming at the moon to take a few shots of my favourite crater, Plato. Contrary to what I've read about the primal focus technique (no eyepiece, webcam attached only) where the resulting image should be low magnification, I found out that the image I got was absolutely huge (as if the magnification was 150x or more) and very blurry. Using AutoStakkert2 I managed to stack a somewhat acceptable image but it's still very blurry. I'm using a Celestron Astromaster 114/1000 Newton and was using Creative's own software @ 640x480, 15 fps. What could be the cause of the problem?
Sorry for my horrible English, I'm from Hungary.
By dwayne dias
I just realized the issues while manually tracking DSOs. As i am new to astrophotograohy, my knowledge is limited. I will be taking short exposure shots and stacking them. But then i came to know that without an eq mount, I will b having field rotation in my images. Can this problem be corrected ????