Moonlight

by Jakub

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bio website mattgrum.com
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visits member for 4 years, 8 months
seen 3 hours ago

May
15
awarded  Nice Answer
May
15
comment Sony a7: Is there more noise for ISO <100?
@inkista only if you're shooting JPEG, if you're shooting RAW you can just keep the camera at ISO100 and overexpose if you're in dire need of a slower shutter speed, and get the same result.
May
15
comment Why is it called “macrofocus” and not “microfocus”?
@Skaperen not really, microscopes make even smaller subjects into big images. Macro lenses simply deal with larger subjects than microscopes.
May
15
answered Why is it called “macrofocus” and not “microfocus”?
May
14
awarded  Guru
May
14
revised Why did I get blurry star trails?
added 9 characters in body
May
14
comment Which has a faster write time: RAW or JPEG?
@RomeoNinov Of course (Canon's RAW compression uses JPEG and then does simple entropy encoding on the difference between the JPEG compressed version and the original), my point was that compression/processing are generally not the bottlenecks, writing data to the card almost always is.
May
14
comment Sony a7: Is there more noise for ISO <100?
Looking at the graph on Bill's page, the only anomaly appears to be the ISO80 result, the others are all very close to 10.5 EV. I don't think this can be the result of compression (I've been studying their algorithm a lot recently) all that happens in the shadows is that values are shifted a bit to the right (i.e. they go from 14 -> 13 bits). My guess is that there's some sort of systematic error in how the RAW values are corrected digitally for for ISO 80.
May
14
comment Which has a faster write time: RAW or JPEG?
JPEG compression is done in hardware and is very very fast.
May
14
answered Why did I get blurry star trails?
May
14
comment Sony a7: Is there more noise for ISO <100?
@theJollySin it's important to note that you're unlikely to actually be able to see a difference of 0.3EV in DR, so the results are not exactly unpredictable, DR will appear to be pretty much the same at all settings between ISO50 and ISO200. As to why the feature exists, it's to allow for longer shutter speeds for people shooting JPEG, who would otherwise not be able to benefit from the extra headroom available.
May
14
revised Sony a7: Is there more noise for ISO <100?
added 7 characters in body
May
13
answered Sony a7: Is there more noise for ISO <100?
May
12
awarded  Nice Answer
May
12
awarded  Enlightened
May
12
awarded  Nice Answer
May
8
awarded  Nice Answer
May
6
revised Is vignetting affected by sensor resolution?
added 12 characters in body
May
6
answered Is vignetting affected by sensor resolution?
Apr
29
comment Why are some big telephoto lenses so expensive compared to telescopes?
@BogdanWilli "fluorite will not "magically" reduce chromatic aberration" actually it will, but it's not magic - it's physics, fluorite is a low dispersion material which means different frequencies of light spread out less when passing through, so it will reduce chromatic aberrations compared to a similar element of standard optical glass.