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by Jakub

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101,454 reputation
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bio website mattgrum.com
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visits member for 4 years, 10 months
seen 34 mins ago

Jul
22
comment What are the anomalies in this picture of earth?
@NormLDude a simple paragraph would have sufficed under the pic that was posted on Flickr "May not be exactly as shown here" or "The quality of this image is 44% of the original" - the artifacts you're referring to are completely invisible until you perform a huge shadow boost, so why on Earth would they need to mention it? Should the same disclaimer be placed next to every JPEG image published anywhere in the web? Images NASA posts on Flickr are for PR purposes, not scientific analysis.
Jul
22
comment What are the anomalies in this picture of earth?
@NormLDude "There seems to be a lot of definition (3d)/depth to this 'anamoly'. The other circles surrounded by tiny circles are pretty interesting also." that is all completely explained by my answer - the 3D shapes come from the primitive building blocks which are all based on [co]sine waves.
Jul
22
awarded  noise
Jul
21
revised What are the anomalies in this picture of earth?
added 604 characters in body
Jul
21
answered What are the anomalies in this picture of earth?
Jul
21
comment Should I use a 24-105 or a 70-200 lens for photographing a high school marching band?
@PhilipKendall none of them. Sigma make a 120-300 f/2.8 though.
Jul
17
answered Is there a lossy compressed file format for 16-bit dynamic range images?
Jul
10
awarded  Guru
Jul
8
comment How can an electronic shutter reduce dynamic range?
Any increase to read noise will reduce dynamic range, I don't know the exact cause but it seems plausible that some aspect of the electronic shutter allows read noise to accumulate before or after exposure, or interferes in some way with one of the read noise reduction systems (correlated double sampling for example).
Jul
3
comment How is focus-breathing controlled in lens design?
@JDługosz It's not a calibration issue - most lenses achieve different focus distances by a combination of moving the lens and changing its focal length as this allows the lens to be more compact. The original Canon 100mm macro for example is reported to be only 70mm at it's closest focus.
Jul
2
comment Are there lenses that exhibit absolutely no focus breathing?
@feetwet it's more that case that cine lenses are specifically optimised for focus breathing whereas other lenses aren't, that doesn't mean there aren't SLR lenses with little focus breathing, though. I imagine it could be reduced to zero, but with everything in lens design it's a compromise so it's never going to be zero in a real lens.
Jul
2
revised What is the impact of the EU discussion on restricting freedom of panorama?
deleted 4 characters in body
Jul
2
answered What is the impact of the EU discussion on restricting freedom of panorama?
Jul
2
comment What is the impact of the EU discussion on restricting freedom of panorama?
It's important to note that this is an EU directive not an EU regulation, that means states are free to interpret the content and implement it (or not) however they see fit.
Jul
2
comment Why do some cameras have a higher resolution sensor even though the max resolution is smaller?
@Muhatashim The edge pixels are permentantly masked, so there will be no difference when turning noise reduction on or off. The masked area is also probably larger than 16 pixels, I suspect the D3300 simply has a marginally larger masked area. 16 pixels on a 6,000 pixel wide image are fairly inconsequential anyway...
Jul
2
answered Are there lenses that exhibit absolutely no focus breathing?
Jul
2
comment Why do some cameras have a higher resolution sensor even though the max resolution is smaller?
@DrMoishePippik No, DSLRs have dedicated metering sensors, metering via liveview uses regular pixels. Some mirrorless cameras (and a couple of Canon DSLRs) have phase detection AF pixels on the main imaging sensor but those are still used to produce the image. That article is about a very specific sensor design used only by Fuji.
Jun
30
answered Why are superzoom lenses small but giant telephoto lenses huge?
Jun
30
answered Can I desaturate incoming light using a filter or series of filters mounted to the lens?
Jun
23
awarded  Good Answer