Red and Blue

by Gordon

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bio website mattgrum.com
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visits member for 4 years, 8 months
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6h
awarded  Taxonomist
2d
awarded  Nice Answer
2d
answered Is it safe to zoom while taking a photo for the effect?
May
22
comment Imbalance in green pixels
Sounds like an instance of PRNU (photo response non-uniformity).
May
22
answered How does a variable ND filter work?
May
22
comment Do wide angle lens adapters maintain DOF but still keep the higher FOV?
Yes APS-C lenses will technically fit, and you can also mount the adapter on a full frame mirrorless body, but the image circle will not be large enough in both cases so it's not particularly useful...
May
22
comment Do wide angle lens adapters maintain DOF but still keep the higher FOV?
It's worth pointing out that the Metabones speed booster is a rear mounted wide converter and so only works with full frame SLR lenses on APS-C mirrorless cameras. It will not work on DSLRs, as there is no space for the adapter (due to the mirror box).
May
22
answered Do wide angle lens adapters maintain DOF but still keep the higher FOV?
May
21
answered Distance measuring
May
20
answered Why is my Sony A57 creating low res JPGs?
May
19
comment What determines the fastest shutter speed for an electronic shutter?
Yes there are CMOS sensors with global shutters, e.g. the one in the Blackmagic Production camera. It's more difficult to implement than in a CCD but it's perfectly possible.
May
19
comment What determines the fastest shutter speed for an electronic shutter?
That's only true for non global shutter CMOS sensors. CCDs or CMOS sensors aren't constrained by how fast data can be read out (in a global shutter architecture charge is transferred from the pixel to a buffer until the camera is ready to read it out). The first generation digital cameras with CCDs would often shoot at 1/1600s, faster than the fastest mechanical shutters available. They could have been made faster if the manufacturers desired (they're only limited by the switching speed of the sensor).
May
18
comment HDR and RAW dynamic range clipping, mapping, and compression
@feetwet The camera's JPEG engine probably clips the shadows a bit, as for lightroom it depends on what settings you apply - if you crank the exposure slider all the way up then it's going to clip the highlights!
May
17
answered HDR and RAW dynamic range clipping, mapping, and compression
May
17
comment Why is it called “macrofocus” and not “microfocus”?
@Skaperen you can attach a microscope to a camera just like you can attach a macro lens. It is not true that microscope refers to the intended subject and macro refers to what the lens does! They both refer to the size of the subject, which is larger with macro lenses. Please remove your original comment, which implies you're summarising my answer but instead says something completely different. You may leave your own answer if you wish!
May
15
awarded  Enlightened
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”?