ZWO filter wheel problem with flats

Focusers, Filters, Barlows etc..

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einari
Posts: 120
Joined: Mon Aug 01, 2016 3:51 pm

ZWO filter wheel problem with flats

Post by einari » Fri May 11, 2018 7:45 am

Hello,

Lately I have been having problems with flats (see the effect of secondary mirror, reflections) and have tried to investigate the cause.
My gear is C8, JMI focuser, Optec 0.5X reducer, ZWO filter wheel (5 position), SXV-694 camera.
Last night I took the camera away and looked while using flat light, and I clearly see light coming from the small holes next to filters.
Could this be the problem and is anyone else having same kind of problems ?

Tapio

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Support@ZWO
Posts: 744
Joined: Mon Apr 24, 2017 10:08 am

Re: ZWO filter wheel problem with flats

Post by Support@ZWO » Mon May 14, 2018 8:00 am

Could provide some images?
Location:lon=120.6 lat=31.3
Suzhou China

einari
Posts: 120
Joined: Mon Aug 01, 2016 3:51 pm

Re: ZWO filter wheel problem with flats

Post by einari » Mon May 21, 2018 8:08 am

Here is one image of the light leak of filter wheel holes.
And second image of a reflection of the secondary mirror of SCT scope.
Why are there holes in the filter wheel ?
Attachments
reflection.jpg
zwo_filterwheel_light_leek.jpg

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Support@ZWO
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Joined: Mon Apr 24, 2017 10:08 am

Re: ZWO filter wheel problem with flats

Post by Support@ZWO » Mon May 21, 2018 3:29 pm

3 small holes for lock the unmounted 31mm filters, the big hole is for change filter position.
If you use something cover 3 small holes, does the reflection will be less?
Location:lon=120.6 lat=31.3
Suzhou China

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