Time to be with your loved ones

Time to be with loved ones

by sat

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

88,209 reputation
3182320
bio website mattgrum.com
location
age
visits member for 3 years, 7 months
seen 11 hours ago

Mar
31
comment Lens hood. Why and when to use it?
Lens hood. When to use it? All the time.
Mar
28
comment What is the largest aperture on a commercially available lens?
I agree it's not really a duplicate - the other question is specifically about DSLRs, the fastest commercially available photographic lenses available right now are all for mirrorless cameras.
Mar
26
awarded  Enlightened
Mar
26
awarded  Nice Answer
Mar
25
comment Why do depth of field calculators show *more* DOF for larger formats with the same lens parameters?
"35mm at 6.29 and... 5"x4" at 34.6" is what you get when you don't account for field of view, if you change the focal length for the 4x5 to 350mm to maintain field of view then DOF drops to 1.5 feet, which is what you'd expect given f/8 is a "fast" lens for 4x5.
Mar
25
comment Why do depth of field calculators show *more* DOF for larger formats with the same lens parameters?
The person's question was, and I quote, "What am I missing?". What the questioner was missing was, if you don't keep field of view constant, then your comparison is meaningless hence the strange result posted.
Mar
25
comment CMYK vs RGB - Can a DSLR take CMYK images?
I'd like to see a sensor with a black filter!
Mar
25
comment CMYK vs RGB - Can a DSLR take CMYK images?
@drfrogsplat No the CMKY printable gamut is totally different to the CMY sensor gamut. CMY sensors collect more light since you're only filtering out 1/3 of the incoming light at each pixel, compared to filtering out 2/3rds of the light with RGB (the yellow filter in CMY only filters out blue light, whereas the red filter in RGB filters out blue and green light). The downside is that you have to infer the RGB values by comparing neighboring pixels (which you do to an extent with RGB) meaning poorer colour separation.
Mar
25
comment Why do depth of field calculators show *more* DOF for larger formats with the same lens parameters?
If you don't keep the same field of view, then you're taking different images and thus any comparison is meaningless. Take an image from an ultra compact at 10mm and another image from a 35mm DSLR at 10mm and they will look totally different. The reality is that people using cropped sensors don't walk around taking images which are very tightly cropped because they're using a small sensor. Hence in the real world you have to conclude that sensor size does matter for DOF, you can't just say "DOF is the same, image is just cropped".
Mar
23
comment Merge HDR using layers
Here is an answer regarding manually merging exposures using layers: photo.stackexchange.com/questions/3394/…
Mar
20
answered Small bedroom studio, what type of lighting for portraits?
Mar
19
comment how to capture the details of a face?
possible duplicate of What is the best techinque to smooth skin?
Mar
17
awarded  Nice Answer
Mar
17
revised Might future advances in sensor technology reduce or eliminate noise?
added 454 characters in body
Mar
17
comment Might future advances in sensor technology reduce or eliminate noise?
"Perfect" would be a photon counting sensor with infinite capacity. You could actually do that today (except for the infinite capacity part), but it would be very expensive. But even that would be noisy in low light. The information simply isn't there as you suggest.
Mar
17
answered Might future advances in sensor technology reduce or eliminate noise?
Mar
14
comment Why don't cameras have autofocus points in the edges and corners?
It's not true that autofocus needs a considerable amount of light, the 6D AF is rated to work down to -3 EV, which is the equivalent of a 60 second exposure at f/2.8 and ISO100! You do get vignetting toward the corners but not enough to stop AF working. The being able to focus on very fine detail would be compromised by a lack of sharpness in the corners, but in principle the ability to measures phase differences with coarse features is largely unaffected by lens softness.
Mar
14
comment How to compare the speed of lenses taking transmission into account?
beaten by 22 seconds...
Mar
14
answered How to compare the speed of lenses taking transmission into account?
Mar
14
revised Display ghost image of last photo in Live View (Canon)
edited title