It's a bird

by Vian Esterhuizen

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bio website mattgrum.com
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visits member for 4 years, 9 months
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Feb
4
awarded  Enlightened
Feb
4
awarded  Nice Answer
Feb
4
awarded  Enlightened
Feb
4
answered What type of effect is caused by different cutoff lengths for IR filters?
Feb
3
comment How can knowledge of human perception of color be used in photography?
@D. Lambert The question was originally "how does the human eye perceive colour", it subsequently changed after I answered it! To be honest it's not all that relevant to photography beyond explaining why there are more green pixels...
Feb
3
comment Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?
@Jerry You'd be fine with Nikon, Sony etc. but not Canon, M43. Still it's not really a 5:4 oversize APS-c it's more like a FF with the sides chopped off... A 5:4 FF sensor would be worth it, but then you'd fall into lens incompatibility again with all manufacturers.
Feb
3
comment Is there any noise difference between averaged and long exposure photos?
@whuber The middle image of the first crop is the averaged one, the middle image of the last crop is the single ISO100 one!
Feb
3
comment Is there any noise difference between averaged and long exposure photos?
@jrista I loaded the images into a stack at 16bpp and merged 8 pairs of layers, then I merged the resultant 4 pairs, then 2 pairs and then the final pair, which is close enough to the mean values for 8 bit output.
Feb
3
comment Is there any noise difference between averaged and long exposure photos?
You can shift images by less than 1 pixel by resampling, you can also do something called super-resolution if you have many misaligned images which treats the non-overlapping sensel locations as extra samples and can increase resolution. see en.wikipedia.org/wiki/Super-resolution
Feb
3
comment Is there any noise difference between averaged and long exposure photos?
@fortran Looking again at the 16 image sequence the first and last images are out by about 1.4 pixels, or 0.02% of the image width. After auto align in Photoshop the images were almost perfectly aligned (to within my ability to detect any misalignment). The total time to shoot the sequence was not much longer than the other 16 second exposure.
Feb
3
awarded  Nice Answer
Feb
3
comment Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?
The speed issue clearly isn't insurmountable, but at 5:4 APS-c camera would lose compatibility with APS-c only lenses (such as Canons EF-s) meaning you'd be selling a FF camera with a narrower sensor. At which point you might as well get FF sensor and crop...
Feb
3
revised Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?
added 299 characters in body
Feb
3
revised Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?
added 346 characters in body
Feb
3
comment Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?
Canon have three DSLR formats and numerous compact and bridge formats so I don't think that's the problem, there are however compelling technical reasons to do with mirror size and registration distance.
Feb
3
answered Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?
Feb
3
comment How are virtual tour photos taken?
You can do it with Photoshop's built in tools but it's a bit more work, you have to get it to stitch the pano normally without floor or sky images, then use the 3D tools to create a sphere map and align the floor and sky by hand.
Feb
3
comment Why do it “in-camera” rather than in post-processing?
Mythbusters actually did a segment on polishing a turd and it turns out with enough polishing you can turn one into a thing of beauty!
Feb
3
comment Why do it “in-camera” rather than in post-processing?
I don't think the question is about fixing up a poorly executed photo in post, but about the implications of effects that can be applied either in camera or in post, with often indistinguishable results.
Feb
3
comment Is there any noise difference between averaged and long exposure photos?
@tomm89 Did you use a tripod and cable release (to avoid moving the camera in any way)? Also did you make sure high ISO noise reduction was turned off? Only the experiment I did revealed no loss of sharpness by blending 16 ISO1600 shots together.