NEW StellaMira 90mm ED Triplet Refractor

[Gary Clayton]

13 minutes ago, Anthonyexmouth said:

Such a missed step not having a graduated one on the SM90 to start with. Now do I buy one of these or save for a field rotator. 

I would have to purchase the larger M63 motorised version and install it in front my field flattener/reducer due to my back focus constraints, so this manual one will do for now. 

[Anthonyexmouth]

8 minutes ago, Gary Clayton said:

I would have to purchase the larger M63 motorised version and install it in front my field flattener/reducer due to my back focus constraints, so this manual one will do for now. 

Really? Are you using up the whole 55mm already? The mini is only 11.5mm thick. 

[Gary Clayton]

9 minutes ago, Anthonyexmouth said:

Really? Are you using up the whole 55mm already? The mini is only 11.5mm thick. 

Yep, I have a Gerd Neumann Camera Tilting Unit in front of my filter tray and I have found my back focus to be bang on at 56mm, taking filter width into account.

[Spaced Out]

On 26/01/2023 at 16:19, Gary Clayton said:

Yes it does unscrew leaving an M63 thread on the end of the focus tube, mine has some play in it causing camera tilt when repositioning the camera for better composition of the target. It's something that I had not noticed until imaging more than one target per night.

Just wondering if the WO rotator did anything to improve your tilt situation at all ? I've got some minor tilt that I suspect might be coming from the rotator.  

 

[Gary Clayton]

15 minutes ago, Spaced Out said:

Just wondering if the WO rotator did anything to improve your tilt situation at all ? I've got some minor tilt that I suspect might be coming from the rotator.  

 

Yes the WO version has no tilt at all that I can perceive even with the locking screw loose, there are also small adjustment screws all the way around the rotator for adjustment if you deem it necessary. I am looking forward to the next clear night to test it out and do a final tilt adjust on my camera "APS-C size sensor" now that I have some consistency.

Edited January 29 by Gary Clayton