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by Jakub

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bio website mattgrum.com
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visits member for 4 years, 10 months
seen 9 hours ago

Jun
3
awarded  Nice Answer
Jun
3
comment Why don't people care any more about shutter speed accuracy?
This doesn't seem to answer the question of why people were more concerned with shutter accuracy in the days of film.
Jun
3
answered Why don't people care any more about shutter speed accuracy?
Jun
3
comment What properties of an image could be used to programmatically discard it as “bad”?
You could detect camera shake, over/under exposure easily enough, and if you were really smart you could attempt to identify the subject of the photo to test whether it was in focus, but that's about it.
Jun
3
comment How close are we to the sensor pixel size limit?
@DigitalLightcraft the two concepts are intrinsically linked, as diffraction is independent of sensor size when comparing images with the same depth of field.
Jun
1
answered What makes the Foveon X3 a “direct” image sensor?
Jun
1
answered Why is the sharpness of a lens often determined by aperture?
May
30
revised What is “ISO” on a digital camera?
added 33 characters in body
May
27
comment Can a Sigma dp3 quattro be used for Macro Photography?
@knb Focus stacking is used to extend DOF, it wont help with resolution at the focal plane. Essentially the DP3 Quattro will photograph a 70mm x 45mm area, any smaller than that will require cropping, how much cropping is required depends on how much smaller, and how much loss of resolution is acceptable is up to you. That's about all I can say to answer your question, other than the poor high ISO performance of the camera can avoided by using a tripod and longer exposure at ISO 100.
May
26
comment Can a Sigma dp3 quattro be used for Macro Photography?
@knb Cropping to a 1cm x 1cm square at maximum magnification will drop you from 20 megapixels down to 0.6 megapixels, not exactly what I'd call "more than enough pixels"...
May
26
answered Can a Sigma dp3 quattro be used for Macro Photography?
May
25
awarded  Taxonomist
May
22
awarded  Nice Answer
May
22
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