I Got a Problem with Gemini Electronic Focuser?
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- Опубликовано: 12 сен 2024
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My first video about Gemini EAF: • I Found The CHEAPEST E...
In this video I share my thoughts after a first night of using a new Gemini EAF that is the cheapest automated electronic focuser on the market. As many people thought, my copy of this focuser has the backlash that is actually not an issue as there is a solution!
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backlash compensation is needed for nearly all eaf. this is not a gemini issue, its a "all eaf" issue :)
The QHY QFocuser Electronic Focuser - High Precision version has close to zero.
@@JoseNavarroCo that would be an exception to the rule. The Gemini seems to be aimed directly at the zwo eaf and that needs backlash compensation
Try using the overshoot method of backlash compensation inside NINA. No need to measure the backlash so long as you specify an overshoot that is larger than the actual backlash. Additionally, you should set the overshoot to whichever side (IN/OUT) that the last move draws the focuser in against the force of gravity so that the focus will not drift from the weight of the camera.
Thank you for these tips, Mike! I'll try them out.
Also a happy Gemini owner here, very happy to have a new decent priced EAF option. Have you looked at the Juwei-17 or Scorpio filters yet? I have had the Juwei-17 for a few months, and am very interested in the Scorpio filters now that they are listed for sale.
Thank you for your comment!
I haven't worked with the mount, but I have purchased the Scorpio filter, and I should receive it tomorrow! I doubt it has true 3nm bandwidth. We'll see after tests. Stay tuned!
@@AstroCreationvery interested in the filter test results, I went ahead and purchased the SHO set, but have no way to test them for accuracy. My main concern is halo performance. Maybe someday we'll get a halo exterminator tool though.
Ty for this, am considering getting one
I'm using backlash compensation method overshoot and that has worked brilliantly for me with two different focusers (Pegasus FocusCube v2 and PegasusFocusCube v3). Think I've kept it at the default values of 0-450. (To be fair; I think that's overkill, but I haven't gotten around to measure properly)
Thank you for the update! 🥰
Nice presentation. Do you know if Gemini has a bracket for C8 Edge?
As I am aware - no; however, you can get a bracket from a different brand
Overshoot backlash is your friend :)
Hey, Cuiv! Thank you for stopping by! Yes, I consider using it too. Have you gotten a chance to try out this Gemini EAF yourself?
@@AstroCreation I've bought it (although I don't need it) and will soon be testing it out! The ZWO EAF also has some good backlash (between 50 and 200 steps originally, not sure how it is these days - although this counts the actual telescope focuser backlash, which is also present) so I'm not surprised - as long as the backlash is repeatable, then we're golden with overshoot!
@@CuivTheLazyGeek same, I didn't need this focuser (I have three from ZWO), but I couldn't pass by due to its price. I am looking forward to watching your video!
P.S. By the way, congratulations on hitting 50k subs!
@@AstroCreation Cheers and thank you! Clear skies!
Two of my preferred youtubers that write on my last purchase!!!!!!!!!!!!!!!!! THANK YOU TO ALL!
I have 40steps of backlash, to note, with this EAF, but temp probe doesn't work, maybe I need to change firmware to an open source myFP2 classic. (hardware is a clone).
There will always be backlash, either in the motor, in the focusing system itself, and in 99% of the cases, in both.
Do not forget the focuser mechanism is made up of two parts 1) the electronic focuser and 2) the mechanical focuser. Could the backlash be coming from the mechanical focuser and you just used backlash compensation in the electronic focuser to overcome the error in the mechanical focuser.
I ordered one but do not have all your equipment. Could the problem have been the equipment installed? Did you attempt to use it with just a lens and no flattener?
I haven't tried it with any different configuration; however, if you "eliminate" some parts of my imaging gear (flattener, EFW, or camera), it would decrease the load onto the focuser.
So I have two questions. How many steps are required to turn the drive shaft one revolution? And what is the diameter of the wheel at the end of the drive shaft?
Thanks for reaching out with your questions about the Gemini EAF! I'll get the answers for you and reply as soon as I have the information. Please stand by.
This is what I got: there are 3840 steps and the shaft diameter is 5mm.
The backlash is in the focuser and not the electronic focuser motor. Any electronic focuser motor will need the same backlash compensation if put in the same focuser. Having to set the backlash compensation is normal and will always need to be specified.
Can you tell what diameter the shaft of the EAF is?
The diameter of the shaft is 5 mm.