Newton Rings

[photon hunter]

I have been having trouble with newton's rings when ever I use a Barlow on the following assembly: Lunt 100, double stacked with Solar max 90, with either a DMK-41 or zwo 177 cameras. Any suggestion as to how to correct/eliminate the rings?
Thanks
Burton

[marktownley]

Tilt the camera or take a flat

[_Zakalwe]

As Mark says, tilting the camera works well. I use a Rowan Astronomy tilt-adapter with my ASI174 camera and it works very well.

[photon hunter]

Thanks Mark and Zakalwe. Will try flats first, if no success then the adaptor. When using the adaptor does the tilt throw one side out of focus?

[MapleRidge]

Hi Burton...

The amount of tilt is very slight, so focus should not be affected.

Brian

[grimble_cornet]

I used to use a DMK41 on my LS100 (and several other scopes) and found that a 'clingfilm flat' solved the problem (search the forum for instructions) unless I was using a TV x2.5 Powermate which seems to be very prone to NR. The tilt method will also work (I made my own unit and have also used a commercial one) BUT....... with early ZWO camera the tilt required was so extreme that I had to fit longer screws to the unit and yes, the focus was effected!

Tiltometer+with+TV+Powermate.jpg (156.6 KiB) Viewed 1927 times

[marktownley]

Cool design Mike!

[Derek Klepp]

Good luck .I find at high mag I see some rings but the flat method usually works well.But I take a defocused flat straight away

[EmilN]

Hi guys. I am new here so please help me with the terminology. I recently purchased PG Chameleon with IMX264 and I see a lot of NR. I am familiar with the tilt method but what is "flat"?

[robert]

Try searching the forum, there are several threads on flats, bag flats etc. Mark Townley and Alexandra Hart (Montana) have plenty to say about flats.
Robert