Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Sun - 6.5.2017 at 15.07 - 6.5.2017 at 16.54 Espoo Observation number 63751

Visibility III / V

Testing the new Quark when the previous one went under warranty due to uneven image area. The goal was to do tests with all of Quark’s settings to see what comes off the best image. As it was not completely cloudless in Espoo, we sometimes had to wait for the clouds to fade and in the end the battery ran out and the monitoring stand turned off and I didn't have time to go through all the settings. So sometimes you have to keep going. Probably the wisest thing to do would be to stay close to the mains, so there would be no need to leave the field a second time with your neck crooked towards new disappointments.

There’s really nothing miraculous about the images, but they show how much the Quark adjustments affect the image. The images are loaded in the order of the settings with the first image material taken with the adjustment knob all the way to the top left (ie in the extreme position clockwise). From there, step by step counterclockwise by turning the knob. 4 pictures were missed, in the previous Quark the best adjustments were among these four, so I got to see.

The darkening of the image area is clearly visible because these do not include flattening correction. In fact, it doesn’t look good at all when you look at those pictures, but you still need to explore more. This is a pretty typical problem for Quark, but if this other device is faulty and the flatten correction no longer bites, then new drugs have to be invented already to photograph the sun.

So the images represent different Quark settings, but of course also changing seeing.

The last picture shows quite a spike, this one has not been attached to my own cell before.

Additional information
  • Observation target
    • Sun
    • Keskitaso
Technical information

Baader D-ERF, TS 80/480 apo, Quark, 0.5x shortener, tilt adapter and ZWO 178MM. About 30 fps, bin3, 2000 frames / image, 10% of the best stacked. Videos with SharpCap, stacking with AutoStakkert3 !, processing with ImPPG and colors with Photoshop.

Send a comment

Comments are checked and moderated before publication If you want to contact the observer directly about possibilities to use these images, use the Media -form.



characters left

By sending in this comment I confirm, that I've read and understood the the observation system's privacy policy.