10-3-2010 Solar Image

[willis]

LS35T, EQ3Pro, DMK41, Registax, PS, top 90% quality of 450 frames stacked. No sunspot, but active region & prominence. Not very good images as everything was done within one lesson.

[社長]

Willis, my understanding is this is your "first photos". So this is very good standard from my point of view, better than many Ha image taken by "beginners" using similar telescopes.

of course, there are still room for focusing improvement compared with this
viewtopic.php?f=3&t=32

would you tell what is the parameter used especially the gain? With LS35T, at this image scale, I guess you stack too many frames than neccessary. Mine only stack 5 to 10, anything more than 20 do more harm than good - trade sharpness for smoothness (noise).

just my 2 cents, may be David can comment more

keep on enjoying this Carl Zeiss version LS35T, you are the lucky few

[willis]

5 - 10 frames? Which means u shot for about 1 second for each video chip.... OK let to do an experiment next time.

[社長]

5 - 10 frames? Which means u shot for about 1 second for each video chip.... OK let to do an experiment next time.

of course you can do that, but my DMK41is at 15fps, so I shoot for 15sec or so, and take the best 10 frames out of the 200+ and stack it. So it is the best 5% of the frames.

of course the other reason I did that is, eclipse is a fast motion phenomenon, so in order to freeze the critical moment (e.g., 1st contact), stacking 20 frames is already too many, enough to blurr the image.

imagine what will happen if you want to image 金星凌日, things change every second, of course the image below is quite bad due to my inproper equipment used then, http://www.astro.hk/85.html