ZWO narrowband filter.

Focusers, Filters, Barlows etc..

Moderators: Sam, Sean.Wang

ZWO narrowband filter.

Postby dydan » Mon Feb 06, 2017 8:48 am

hi~

I have ASI1600MM-C Kit,
found some abnomaly behavior in flatframe of narrowband.

attached samples is flatframe of ZWO narrowband 31mm filter.

the brightness of the central part is abnormal.

i think the cause is a metal part of filter border,
that part reflects a lot of light.

do you have the same experience as me?


Thanks
Attachments
flatframe of 31mm H-Alpha_s.jpg
ZWO 31mm H-Alpha filter
flatframe of 31mm O-III_s.jpg
ZWO 31mm S-II filter
flatframe of 31mm S-II-s.jpg
ZWO 31mm S-II filter
dydan
 
Posts: 5
Joined: Mon Feb 06, 2017 7:31 am

Re: ZWO narrowband filter.

Postby Sam » Tue Feb 07, 2017 2:14 pm

it looks like flash of your light source
ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China
User avatar
Sam
 
Posts: 2479
Joined: Thu Feb 21, 2013 2:51 am

Re: ZWO narrowband filter.

Postby dydan » Wed Feb 08, 2017 8:11 am

Sam wrote:it looks like flash of your light source



The light source uses a conventional tablet PC. (T-Shirt flats)
lightsource.jpg



as you see in the picture i attatched, the green marked area is considered sttange :cry:
11.PNG




The border of Metal part of filter seem to be causing it.
EFW_14.png
dydan
 
Posts: 5
Joined: Mon Feb 06, 2017 7:31 am

Re: ZWO narrowband filter.

Postby Sam » Fri Feb 10, 2017 1:42 pm

the actual filter area is 28mm only
so metal part should not cause this problem

it looks very strange especially the right up corner
ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China
User avatar
Sam
 
Posts: 2479
Joined: Thu Feb 21, 2013 2:51 am

Re: ZWO narrowband filter.

Postby AL Bates » Sun Feb 12, 2017 1:42 am

Just maybe a black marker may take care of that metal ring
AL Bates
 
Posts: 51
Joined: Mon Aug 08, 2016 3:08 am

Re: ZWO narrowband filter.

Postby dydan » Tue Feb 14, 2017 6:10 pm

Sam wrote:the actual filter area is 28mm only
so metal part should not cause this problem

it looks very strange especially the right up corner


AL Bates's opinion was right.

I fixed the problem by masking the border.

Thank you AL Bates

It is certain that there is a design problem of the ZWO filter.

1.jpg


2.jpg


3.jpg
dydan
 
Posts: 5
Joined: Mon Feb 06, 2017 7:31 am

Re: ZWO narrowband filter.

Postby dydan » Tue Feb 14, 2017 6:13 pm

Sam wrote:the actual filter area is 28mm only
so metal part should not cause this problem

it looks very strange especially the right up corner


Before
before.PNG


After
after.PNG



I don't like to recommend ZWO filter
Last edited by dydan on Tue Feb 14, 2017 6:20 pm, edited 1 time in total.
dydan
 
Posts: 5
Joined: Mon Feb 06, 2017 7:31 am

Re: ZWO narrowband filter.

Postby dydan » Tue Feb 14, 2017 6:14 pm

AL Bates wrote:Just maybe a black marker may take care of that metal ring


Thank you AL Bates
dydan
 
Posts: 5
Joined: Mon Feb 06, 2017 7:31 am

Re: ZWO narrowband filter.

Postby Sam » Tue Feb 21, 2017 9:01 am

we just checked this problem
it is caused by the side of the glass
one way to improve is paint the side of the glass to black
ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China
User avatar
Sam
 
Posts: 2479
Joined: Thu Feb 21, 2013 2:51 am

Re: ZWO narrowband filter.

Postby Astrodude » Fri Mar 03, 2017 10:53 am

I have the same kit and the same issue.

Before I attempt to fix this would can you clarify if it is the edge of the face of the filter that needs painting black (like dydan has done with the rings he made) or is it better to coat the thin edge of the filter itself (the side not the face), or maybe both?. Also would a permanent marker be the best option if its the side that need coating.

Also, (forgive me if this is a daft question) do the filters need to be placed in the EFW a specific side down. I know that some filters have an arrow on them as to which way they should be used but the ZWO filters do not.
Astrodude
 
Posts: 5
Joined: Wed Feb 22, 2017 12:12 pm

Next

Return to Accessories

Who is online

Users browsing this forum: No registered users and 1 guest
cron