sumangeek

I've been trying to get a pretty good widefield shot of Orion and Taurus for a long time. Here are some of the recent images I took Above is the Orion shot taken on a fixed tripod using Canon 550D unmodded 55mm lens @ ISO 800 & aperture 2 secs. Image was stacked using 30 lights and 25 darks. Am not too happy with the post processing. Could any of you comment on this. I have some queries while taking photos on a fixed tripod. How does the shutter speed change with latitude, longitude and sensor size for avoiding star trails. 2 secs for the orion shot gives star trails extending to 2 pixels on the sensor. Also do I have to apply a proper White Balance to each image in the lights and do a stacking. Here is a shot of taurus + orion canon eos 550 D unmodded, 18mm, 20 sec, ISO 800. Stacked using 12 lights and 9 darks. I am unable to remove the greenish tinge in the bottom of the image. Original raw file has a reddish-orange background colour. Could you tell me a way to remove the greenish tinge and also to make the image sharper? Cheers Suman (www.slickr.com/sushant_vk/)

Awesome shot.

Awesome shot

Thanks a lot guys

Hi Ronin, The mask is also available for DSLRs. But how the aperture and focal parameters are set is something to be seen

Hi, I am planning to make my own Bahtinov mask for my canon 18-55mm stock IS lens. I've come across this website (http://astrojargon.n...kGenerator.aspx) which creates templates for the mask. I've experimented with these settings (focal length = 55mm, clear aperture= 55mm/5.6 = 9.82 mm, Edge thickness = 10). Unfortunately the template turns out to be small. I've somewhat "intuitively" chosen the parameters. It would be great if someone explains what focal length and clear aperture actually mean? Cheers Suman

Thanks everyone

Hi, I am planning to make my own Bahtinov mask for my canon 18-55mm stock IS lens. I've come across this website (http://astrojargon.net/MaskGenerator.aspx) which creates templates for the mask. I've experimented with these settings (focal length = 55mm, clear aperture= 55mm/5.6 = 9.82 mm, Edge thickness = 10). Unfortunately the template turns out to be small. I've somewhat "intuitively" chosen the parameters. It would be great if someone explains what focal length and clear aperture actually mean? Cheers Suman

Hi everyone, I am Suman and am from Bangalore, India. Iam a scientist by profession and my area of expertise is in numerical simulation. I have been fascinated by stars for a very long time. A couple of years back I've bought a DSLR exculsively for astrophotography and enjoy spending time in taking photos on starry nights. I've always looked out for forums on astrophotography to develop skills and I am pleased to join this community. Hope to have a wonderful experience here. Btw I run a flickr site (although I do not update it frequently ) www.flickr.com/sushant_vk/ Cheers Suman