Strange rows artifacts using Powermates

bermassi

Hello, I'm new on this forum and have a ZWO ASI 174 MM for solar imaging coupled to a Coronado Solarmax II 90mm. I just toke a few nice (I think) images with this setup and recently tried to add a Powermate lens (both 2.5X and 5X) to magnify some details. The problems is that when I introduce the powermate some strange artifacts (big rows and small concentric columns) appear in the shot. This issue is not correlated to optics cleaning or exposure time.

I have attached a couple of shots got with Powermate 5X but the same is using 2.5X. No problems using the ASI 174 without Powermates. Also the problem is present using Oa Capture on a Mac and FireCapture on a W10 PC.

Any suggestions?

Thanks

Max

lpistor

Hello, look here:

http://zwoug.org/viewtopic.php?f=21&t=1408

bermassi

Many thanks.

So, are maybe the vertical thiny lines in my image the so called "Newton rings?" And what about the bigger horizontsl rows?

Anyway I will try what the post suggests.

Best.

Max

riklaunim

It's all of them. Tilt the camera to remove them.

Sam@ZWO

you need this:

https://astronomy-imaging-camera.com/products/accessories/t2-tilter/