Suggestions for Scope upgrade?

[bertinspace]

Hi, I purchased an astrophotography rig second hand about a month ago and im hooked.
It came with an Orion Premium ED 110mm 770mm F7 primary Scope. The scope has served me well in the first months but i am getting comma stars taking up a significant portion of the frame so looking for an upgrade.

Suggestions?

[Saturnine]

Hi Arnold, welcome to the forums and astronomy. There is no need to worry about the coma at the edges of the frame, it can be reduced even eliminated completely by adding a field flattener, coma corrector to the set up. There are several makes readily available via retailers, like this -

https://www.ebay.com.au/itm/204315219061 https://www.bintel.com.au/product/orion-field-flattener.

and may pop up in the classifieds here now and then or just do a search for field flatteners via your browsers. There is plenty of info out there on how to set them up, spacing etc.

[bertinspace]

Thanks heaps for that! I just looked through the gear that the setup came with and i found an orion 0.8 Focal reducer....i assume that will help with feild flattening as well?

[croweater]

Hi Arnold. I had a look on Orion's website and it mentions that their .8 reducer flattens the field as well so you should be good to go.
Cheers, Richard

[ChrisV]

You'll just need a set of spacers to get the sensor - reducer distance correct !!

[JA]

Hi Arnold,

It would be good to know which camera you were using when your images were beset with stars with coma. If you are using too large a sensor for the image circle of your scope you will see all sorts of aberrations. If that is indeed the case, a reducer could make it worse as you will then see closer to the edges of the now reduced image circle.

Best
JA

[bertinspace]

I was using a DSLR (EOS 60D Unmodded) but i have picked up a ZWO 294MC pro so will see how we go with that.