Astromart

April 15, 2007 09:21 PM Forum: CCD Imaging and Processing/Deep Sky

The Whirlpool

Posted By Vincent Bert

One of my favorites too, I try it again every year grin

Beautiful rendition of this showpiece.

August 14, 2007 07:13 PM Forum: CCD Imaging and Processing/Deep Sky

Flats and darks

Posted By Vincent Bert

Hi Floyd, you might be confusing what flats are used for. You dont apply a flat to a dark (there is no light in a dark grin

)Nor do you need to apply a bias to a dark (the bias is already part of the dark frame so when you calibrate a light frame with a dark, the bias is also done by default) You will however use a bias to calibrate flats if they are not dark subtracted.

I calibrate all my images with darks and flats. With a very small chip and evenly illuminated field calibrating with flats **may** not be necessary. However, one other thing that it will do is get rid of any dust motes that may show up in an image from the camera window, filters or FF/FR's.

You do not have to do flats for each exposure time, only for each filter.

The only thing I use a bias frame for is for calibrating flats, or if I want to scale my darks.

August 29, 2007 11:36 PM Forum: CCD Imaging and Processing/Deep Sky

Omega Nebula Ha

Posted By Vincent Bert

very nice shot Greg! Congrats on a fine image.

September 21, 2007 04:13 PM Forum: CCD Imaging and Processing/Deep Sky

Bubble in two color modes

Posted By Vincent Bert

Roland Christen said:

(Anthony likes diffraction spikes so these were added via string across the aperture).

Isnt there some kind of law that prohibits putting diffraction spikes on an image taken with a beautiful AP triplet? If there isnt, there outta be. grin

OF course, I say that in jest, he can do whatever he likes, its his image. grin

September 21, 2007 04:50 PM Forum: CCD Imaging and Processing/Deep Sky

M15 in a Mewlon 250

Posted By Vincent Bert

Nice Paul! man you have jumped in with both feet with your new camera and the Mewlon, congrats!

Just a suggestion. When I opened up your image in PS the histogram was squished up against the left side and there was more data to bring out. I attached a more stretched version and included the resulting histogram. Since I used your already stretched 8 bit image I could not keep the core from getting partially blown out. However, starting from scratch you may be able to bring out the fainter stars and with a careful manipulation of curves on the upper end while stretching, and can keep the core from blowing out.

Vince

September 21, 2007 08:09 PM Forum: CCD Imaging and Processing/Deep Sky

NGC7822 - Now with COLOR added

Posted By Vincent Bert

Nice image Tyler!

September 22, 2007 07:25 PM Forum: CCD Imaging and Processing/Deep Sky

The Pleiades

Posted By Vincent Bert

thats an outstanding image dan. You did a masterful job of bringing out all the nebulosity and still keeping the bright stars in check. Colors look really good as well. great image!

September 23, 2007 11:17 PM Forum: CCD Imaging and Processing/Deep Sky