question about material in 5 podition ZWO EFW

Focusers, Filters, Barlows etc..

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JamesRC
Posts: 19
Joined: Sat Jun 24, 2017 2:03 pm

question about material in 5 podition ZWO EFW

Post by JamesRC » Fri Nov 30, 2018 1:45 pm

Hi,
I have just begun using my new ZWO EFW Mini. It works very well so far, but I have one concern I would like to ask you about:
The stepper motor depends on shaft friction with a rubber ring mounted on the filter wheel, for activation. Can you say anything about how well this will work at low temperatures (around 0 degrees C)? Most rubbers will be hard and stiff at temperatures like this!

Thank you very much,
James

JamesRC
Posts: 19
Joined: Sat Jun 24, 2017 2:03 pm

Re: question about material in 5 podition ZWO EFW

Post by JamesRC » Sat Dec 01, 2018 2:13 am

That's "position" not "podition", of course.

Sam, let me try to ask as a more specific question:

Can the 5-position ZWO EFW be used successfully at temperatures around zero degrees Celsius?

Thank you,
James

JamesRC
Posts: 19
Joined: Sat Jun 24, 2017 2:03 pm

Re: question about material in 5 podition ZWO EFW

Post by JamesRC » Sun Dec 02, 2018 1:38 pm

Hi,

I guess nobody else can answer this question. So I can be the first, if I can ever get my scope out at night long enough to test this :?: :(

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Sean.Wang
Posts: 562
Joined: Mon Apr 24, 2017 10:08 am

Re: question about material in 5 podition ZWO EFW

Post by Sean.Wang » Wed Dec 05, 2018 1:57 am

JamesRC wrote:
Fri Nov 30, 2018 1:45 pm
Hi,
I have just begun using my new ZWO EFW Mini. It works very well so far, but I have one concern I would like to ask you about:
The stepper motor depends on shaft friction with a rubber ring mounted on the filter wheel, for activation. Can you say anything about how well this will work at low temperatures (around 0 degrees C)? Most rubbers will be hard and stiff at temperatures like this!

Thank you very much,
James
It works well at ZERO degree, that's no problem.
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JamesRC
Posts: 19
Joined: Sat Jun 24, 2017 2:03 pm

Re: question about material in 5 podition ZWO EFW

Post by JamesRC » Wed Dec 05, 2018 3:42 pm

Thank you, Sean.

I just used it last night during a long session at 21F (-6 Celsius) and it worked fine. So I am reassured :-)

James

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