Difficulty guiding with ASI585mc Air

givoly

I have the ASI585mc Air. I've tried this on two Newtonian reflectors with a coma corrector. In neither does it guide well with the built in guide scope - including a Quattro200P that claims a full frame sensor image circle..
On the same rig (focal length 800mm), same time, same conditions, etc, I get sub 1 arcsec guiding with a 50mmf4 guide scope. However, when using the built in guide camera it achieves very poor guiding and also loses the guide stars often and get totally confused. I tried this with different focuses for the guide camera - to have it between "V-shaped" stars and "I-shaped" stars. But stars never seemed round... neither produce good guiding.

It's good I didn't disconnect my guide scope and camera, but the idea was to reduce weight and move this gear to another rig... Now I need both.

How do you suggest we guide using the Quattro 200P, for example, and the ASI585mc Air?

(incidentally, I also suggested a different rearrangement of guide camera vs main camera that probably would have made this problem not happen..)

Photon08

Have you tried bin2 for the guide camera?
You can also use higher gain.

Btw, I agree that putting the guide sensor along the long side of the main sensor instead of the short side would make 585mc air work better with a telescope with a smaller imaging circle.

Sonixx

Hi givoli,

I haven‘t had any such issues wirh my 585air, but I am using it with a refractor.

It is important to highlight that you need to calibrate the setup every time you rotate the Camera. Also as said above, use binning and highest gain, especially when used with Narrowband filter.

Careful (un)focusing is critical, try to get the stars as round as possible, slightly defocusing the image often helps when off axis guiding.

Best regards,

Stephan

RUa7dc98

I've used mine all the last night. Asiair 2.3.3 and L-eXtreme filter. No problem at all and around 0.5" error. My rig is 71f from askar on eqm-35 and the asi585mc air only. Gain was set at 'high', 1 sec of exposure and bin1.
Shoot for all the nigh. Around 10 hours with automated meridian flip. Everything has worked very well. Many people mentioned problem with guiding and last asiiar version... Maybe you are using 2.4.x ?

Yesterday was my first try with the L-eXtreme and I was a bit nervous about this with built-in guiding sensor... But no problem at all. Hope this helps...

A6sGFz4a

RUa7dc98 Hi, I'm a complete newbie... and I think I made a mistake. I recently bought the same camera, the ASI585MC Air, along with a 1.25-inch filter set (Optolong IR/UV Cut, L-Pro, and L-Extreme) and a filter wheel. I opened the camera but haven't tested it; the filter set is sealed... because, on reflection, I don't think the 1.25-inch filters will work for the camera's image circle. The question is, what size filters do you use? Thanks in advance. Best regards.

Corsair

A6sGFz4a Pretty sure you need 2 inch filters.

RUa7dc98

Corsair you're right. 2" needed with the asi585mc air.

I use a 2" L-eXtreme and it works well. I'm pretty sure we could use 1,25" filter if we design some specific interface to place on a standard holder. The idea is to center the 1,25'' filter on the both sensors and not on the optical axis of the rig.

I'm pretty sure it would work but I'm not able to design such interface (kind of small round pla decentered adapter) and in case it is not working i would buy a 1,25'' filter for nothing.... 😅 So I decided to buy a 2'' filter.