CaK from 6. March - new season 2013!
Posted 09 March 2013 - 01:02 AM
Here are two results. Note the marked structure in the second picture. I 'm not sure how I need to evaluate them morphologically.
In March , the sun is in Germany is still relatively low on the horizon , and often head over a cold flow from Scandinavia. Therefore, the seeing conditions for CaK are very bad. Nevertheless , many structures clearly. In the coming weeks , the atmospheric conditions are better.
Posted 09 March 2013 - 01:41 AM
I look forward to your fantastically detailed images.
Posted 09 March 2013 - 07:18 AM
Posted 09 March 2013 - 11:10 AM
Posted 09 March 2013 - 12:28 PM
Posted 10 March 2013 - 05:47 AM
Mark: interesting link.
The pictures were taken with the double stacking CaK Luntfilter. It is a relatively expensive process , to increase the contrast of the image with two filters on. However, I know of no better way for us amateurs , if the price is to remain affordable.
The exposure time was 1/30sec and the Gain was 500 (DMK 31), 75 frames was stacked.
Posted 10 March 2013 - 07:02 AM
Posted 10 March 2013 - 07:43 AM
the focal ratio of the beam was about 1:12 - 1:14.
To work in this relative big half- width of about 1.5 A ( double stack ) does not need the telecentric beam path. Professionel calcium Lyot filters have a FWHM of 0.3 A. This is necessary to the filters in the parallel beam to place.
The filters have only a small diameter and can stand only at certain points in the beam path – for example, just before the camera chip or on a Lyot diaphragm.
Posted 10 March 2013 - 08:08 AM