Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User
JoLo
sage
Reged: 02/09/10
Loc: Highland, IL
|
Re: My DIY Light Box for Flats
[Re: DaemonGPF]
#5238980 - 05/25/12 01:03 PM
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Yeah, I actually used vellum, couldn't find milk plastic for the diffuser, now that i think about it. I combined various plans I found on the internet, but my basic design was from here:
www.asignobservatory.com
Unfortunately, I can't get that website to come up. Google DIY Lightbox for Flats and you will get several links. The hardest part for me was wiring the LEDs, but it all took just a couple of hours.
I will post a pic when I get home.
Joe
|
CounterWeight
Postmaster
Reged: 10/05/08
Loc: Cloudyopolis, OR.
|
Re: My DIY Light Box for Flats
[Re: DaemonGPF]
#5238988 - 05/25/12 01:04 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Doesn't look bad at all to me, there is a little of what I called 'dark ripple' that I used to get on ocasion with my OSC CCD - and some noise, but you mentiond that resulted from your pushing the saturation. Might just be a matter of not being as agressive? Depending on what software you are using for post processing, how you go about it - should get something really nice out of this?
|
zAmbonii
Carpal Tunnel
Reged: 01/19/08
Loc: Ypsilanti, MI
|
Re: My DIY Light Box for Flats
[Re: shawnhar]
#5239058 - 05/25/12 01:49 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
Can you expound on "not quite right"? Was there a pattern, not bright enough, not evenly illuminated? One of the guys in my club tried one kind of like this and ended up with a projector screen and one of those "natural light" bulbs with diffuser, but I don't have a proper obs so I need to do something like this.
When I said, not quite right. When processing, the flats didn't correct to a flat field. I seemed to have some overcorrection in the corners.
In my light box I created it with three diffusion layers. Basically a hole covered with vellum paper. In the top compartment, I put 4 small tungsten bulbs facing up (one in each corner). I never really put that much time into figuring out exactly why I was having problems, but it either came down to 1) I was not lighting things evenly enough or 2) the light was not playing well with my light pollution filter
I'm recently ran into problems with my flats in my last few imaging sessions and will probably get that light box back working and test it out again.
I wouldn't want to worry that much about the color of the flats, just as long as you have the exposures for each channel working kinda right.....also don't worry about it being darker in DSS, when you view in DSS, it applies a gamma curve to the exposures when showing them and it makes them look differently than what shows on the back of camera screen (look at the top right of the DSS screen you can slide the triangles and squares to adjust how the image looks on the DSS screen...does nothing to the actual data.).
|
shawnhar
Carpal Tunnel
Reged: 06/25/10
Loc: Knoxville, TN
|
Re: My DIY Light Box for Flats
[Re: CounterWeight]
#5239059 - 05/25/12 01:51 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Thanks Jim, it looks ok on my laptop screen but my work LCD gives a real nasty orange and lots more noise.
I think the final image will turn out pretty nice, but this was more a test for the flats, which I think will definitely work...but I just had to try and image something, I had the camera and it was mostly clear...can't let that go to waste!
|
shawnhar
Carpal Tunnel
Reged: 06/25/10
Loc: Knoxville, TN
|
Re: My DIY Light Box for Flats
[Re: zAmbonii]
#5239075 - 05/25/12 02:01 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Thanks Zambonii! That helps a lot!
|
jerryyyyy
scholastic sledgehammer
Reged: 10/06/11
Loc: Stanford, California
|
Re: My DIY Light Box for Flats
[Re: shawnhar]
#5239829 - 05/25/12 10:08 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I think I am really seriously ill reading this set of posts in detail while I came here to figure out what type of t-shirt to use when capturing some new flats tonight. 
|
shawnhar
Carpal Tunnel
Reged: 06/25/10
Loc: Knoxville, TN
|
Re: My DIY Light Box for Flats
[Re: jerryyyyy]
#5240082 - 05/26/12 12:54 AM Attachment (9 downloads)
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
The correct answer for me is "one of my wife's t-shirts", cause her whites are always whiter...
I'm callin it on this pic, only so much you can do with 30 second exposures, even if you do have almost 100 of them. Way better than my 1st attempt.
|
|
9 registered and 9 anonymous users are browsing this forum.
Moderator: Undermidnight, fishonkevin
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 1256
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
