On Fri, Feb 23, 2024 at 11:02 PM, <lorentoole@...> wrote:
The term "springy oscillation" describes what I see when mainly centering the scope for visual use i.e. repetitive image movement with a period of maybe less than 1/2 second.
I've observed really minor play in both RA and DEC blocks (with tight clutches), it doesn't appear to be caused by loose hardware at either worm per-se, this was tested with the CW and OTA mounted. I've adjusted Gemini's TVC factor with no improvement (currently set to value 5). I need to do more experimenting to isolate the effect I'm trying to describe, it's possible that the oscillations are occurring on both axes, maybe due to a mechanical coupling on the 30" steel pier that the mount is bolted to.
I'll try to upload a video showing centering movement using RA and DEC commands.
Loren,
Are you saying the target in the eyepiece is oscillating back and forth as you look through it, or just a little bounce when the slew settles? Not sure of the magnitude of your issue. We make some efforts to minimize any periodic errors during imaging, to avoid elongating the stars. But these motions should not be visible when doing visual. You may have some side-to-side drift with worm period, but that should be over a 4-minute period.
CS,
John
?
--
_____________________________________________________________________________________________________________________________________________________________________________
Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user
