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EAF snags on slow speed

Astrophotography Beginner Equipment Accessories
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#1 jatneums

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Posted 02 August 2021 - 05:15 PM

First time with an EAF. bought the ZWO 5 v EAF and have the Radian Raptor. Testing it out with the hand controller, it appears to snag on the slow setting. At first I’m thinking it could be that the unit is “too flush” with the telescope focuser and friction was causing it, but fast works fine apparently. Hand focuser move smooth manually. Locking nuts are tight so I’m at a loss.

Had a thought. I installed it on the coarse focuser side as instructions say, would that have any effect?

Many thanks for any help

Edited by jatneums, 02 August 2021 - 05:18 PM.


#2 OldManSky

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Posted 03 August 2021 - 09:48 AM

Having it on the coarse focuser side is correct.

I've got a ZWO EAF installed on a Sharpstar 61EDPH-II (twin to your Radian Raptor) -- no issues.

Make sure you have the focuser tension thumbscrew loosened all the way -- I just removed mine.



#3 AhBok

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Posted 04 August 2021 - 08:17 PM

Some EAFs have a good bit of backlash which might be noticeable at slow speed, but not at fast speed (assuming you are using the little hand paddle). I’m not clear on what you mean by “snags”, but backlash could mimic it. Otherwise, it might be simple slippage which means tighten the tensioner as has been pointed out. I replaced my tension screw with a socket head Allen screw to get it tighter than possible with the thumbscrew.


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