Quote:
Originally Posted by SkysoBright
yeah, thanks for the info. not dissing the ED80, but wouldn't i get better images with the 8 or 10" newt?
i have the laptop which i plan to use for astro work. so it's mainly everything else. i was reading last night that a guide scope will increase exposure times dramatically and am seriously considering that idea if and when i spend the money.
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A newt on a EQ mount works but there are the added issues of collimation to learn...and collimation sag due to OTA/Camera mass. The mass of a camera (and coma corrector & yadda) can sag a newt OTA one way but as the mount moves this sag vector will change, effecting collimation (depending on OTA rigidity, camera mass etc) . This can be a big issue for even experienced users and why short FL are the rage (and they gather light quickly) and they have less moment arm...that's why I recommend the ED80.
A big newt on an EQ (lets say an 10" @F4) is over a metre and this can be easily upset with even mild breezes.
There are always nice scopes for sale here 2nd hand and maybe one of these can suit you.
A guide camera does auto corrections (with guide software) to the system tracking the object, keeping it centred. But there are limits due to how well you aligned the mount to the SCP, OTA sag, breeze, the capability of the mount, ...but generally always use a guide camera.
Need an EQ6 for a big newt.
Just say'in!