well this one looks a touch better than the last
i touched up my drift alignment, still not 100% but its close enough while i'm still playing around. my good friend next door (....) had his flood light pretty much right on where i was set up so that didn't really help a lot.
nearly 3 hours of data here and its well worth it, i wish it was possible to upload the tif
i'll definately be going back over this one tomorrow with fresh eyes, i just wanted to get an eyeball on what i'd captured.
i'm not sure whats happening in the top left corner of the frame either, i don't think the darks are subtracting properly as i can see a fair bit of what looks like amp glow (??) before calibration. its almost like a bit of vignetting behind the amp glow, that corner seems to be black clipping in all of my images so far which is why i had trouble setting the black point.
That's one heck of an image there Tj ... plenty of detail. Perhaps you should try using flats to deal with the vignetting. I'm not up to parr on the procedure but others in IIS are ( I'm sure someone will tell you about it ) and there are articles on the subject in the projects and articles link top left of site menu. The only other thing you could try would be GradientXTerminator but with such a full frame I don't think it's the answer ... it really works best when you have some space around the subject.
Good work !
p.s. I just did a quick GradientXTerminator filter on your big image and reduced it etc to post. You can see what effect it has had. I still tend to think flats may be a better solution/more subtle but that's up to you and others opinions.
Hi Tj, wow what a visual treat! A real 3D feel. The knot, twists and swirls seem to have a lot of depth
Do you need a light box for a decent flat? I have heard others mention just a white t-shirt over the lens and exposing to 1/3rd of the full pixel value range?
Your doing well Matty that one has come up a treat, well done, with your darks, best to do INCR on, and the flats, no need for a light box, you can even shoot the clear sky 20 minutes or so after sunset, and set your exposure on AV, or use the white cover of the lens trick, they all work fine, but a bit of getting used to I suppose.
Thanks guys, i was really happy with the detail i got in this one.
i still dont think the top left part of the frame is from vignetting or the lack of flats (even though thats still a big problem) i think its more to do with the way the dark is being applied.
that entire corner is filled with amp glow in my subs and when the dark subtracts it, it seems to subtract the data with it causing it to clip before the rest of the image.
Leon: this thing doesn't have INCR or AV mode mate
i'm going to shoot some more darks in a minute and try calibration again, ill also try to get some flats somehow, even if they aren't 100% they should be better than nothing.
i had been searching for different ways of taking flats and i never even saw the shopping bag way, made sense when i saw it over the end of the tube though.
i didnt think it would diffuse the light enough for where i was aiming the tube (a painted brick wall) thats why i was suprised that it worked so well
I sort of have to thank my wife for this method, cause at the time of me trying to do flats by different means (As yourself), my wife calls out to me to help her bring the shopping inside. On my way to and from the car picking up the shopping, it struck me to use the bags.. Even i thought it was a crazy idea, but it worked.
The newest calibration is a great improvement over the originally posted image, and to think its all thanks to a plastic shopping bag! Is there no end to their usefulness?
The details and contrast are mind blowing.
