Here's my attempt at some astrophotography using my home made motorised barn door tracker. deep sky stacker & photoshop.
34 Light frames 30 to 40 seconds f/2.0; ISO 1000
19 Dark frames 30 seconds f/2.0; ISO 1000 with lens cap on.
17 Bias frames 1/4000 sec; f/2.5; ISO 1250 with lens cap on.
Russ thats' s a great image for a barn door. Well done mate. Only tip I could offer is to take a couple of flats. It actually doesn't look like you need them really, but even so I find the images always turn out better when they are included. Keep them coming mate that lense is a cracker.
my latest shot using my DIY barn door. 10 x 1 min subs. darks, bias & flats subtracted in nebulosity. Tweaked in PS CS6. Was shot @ 50mm ISO 1000 f/4.5.
I'm pretty happy with my latest result, I have come along way since my first shot but I know I've still got a long way to go!
Any tips would be appreciated, would love some constructive criticism!
Here's my attempt at some astrophotography using my home made motorised barn door tracker. deep sky stacker & photoshop.
34 Light frames 30 to 40 seconds f/2.0; ISO 1000
19 Dark frames 30 seconds f/2.0; ISO 1000 with lens cap on.
17 Bias frames 1/4000 sec; f/2.5; ISO 1250 with lens cap on.
If anyone has any hints or tips please comment!
Great images Russ. Flats make a difference and are worth including for other than vignetting. I am curious as to why you took the bias frames at a different ISO, not that it matters I guess, a bias is a bias? What type of camera?
OMG, it's beautiful. do you have step by step editing process in photoshop? I'm newbie, never get this kind of image in one shot.
I make a few adjustments in photoshop. Brightness & contrast, levels, curves, exposure, & saturation (editing each color channel). I don't have any set guide lines though, I just make little tweaks until it I like the look of it. I also like to use the unsharp mask, create a layer mask paint over the areas I want it to work on, it helps to bring out more details in the dust clouds etc. It is hard to type everything, I'll have to make a youtube video one day! P.S there are already a lot of vid's on youtube. a good one is 'how to edit the milky way'
Quote:
Originally Posted by rcheshire
Great images Russ. Flats make a difference and are worth including for other than vignetting. I am curious as to why you took the bias frames at a different ISO, not that it matters I guess, a bias is a bias? What type of camera?
I'm not sure why my bias were at a different ISO, I would usually shoot at the same ISO, but you are right, I don't think it really matters. I use a 6D P.S. I did use flats, I forgot to type them in. ooops.
If you are using dark frames, taking bias frames actually introduces noise.
1. Light frames contain the read noise, dark current and signal.
2. Dark frames contain read noise and dark current.
3. Bias contain read noise.
If you subtract the darks from the lights, you have removed the dark current and the read noise. If you then subtract the read noise again, you are introducing that same noise into the image again only inverse.
Your results look amazing. I've always wanted to make a barn door tracker. Was it hard to build?
