Red Cherry Shrimp

by fahad.hasan

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98,579 reputation
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bio website mattgrum.com
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visits member for 4 years, 7 months
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1d
comment Why is the field of view of my lens narrower than my calculations show it should be?
@BenJO I would try and rule out lens correction first as it's the most likely cause. Are you shooting RAW or JPEG?
1d
comment Why is the field of view of my lens narrower than my calculations show it should be?
@mattdm that's what bold is for :)
1d
comment Why is the field of view of my lens narrower than my calculations show it should be?
@mattdm yes, I stated that much in my answer, it's pretty much the only one that can explain the entire discrepancy by itself (unless they are flat out lying about the focal length (or sensor size)).
Apr
13
comment Are 2 megapixels enough for HD resolution pictures?
@jrista I don't know what the situation is in the US, but here in Europe Lanczos and other kernel based filters are part of the preschool curriculum ;)
Apr
13
comment How to take upright grave stones without squatting down?
Taking a laptop is a bit extreme, some cameras allow you to focus and compose with a smart phone which more practical!
Apr
9
comment How can a super tiny iPhone 6 Plus lens produce significant DOF?
So much misinformation... it's the result of focusing close. Nothing more.
Apr
9
comment How can a super tiny iPhone 6 Plus lens produce significant DOF?
This is mostly incorrect. Whilst the aperture ratio (f-stop) influences depth of field it is by no means the determining factor, in fact the absolute diameter is more important than the ratio. A 50mm f/1.0 lens on M43rds camera will give you the same depth of field as a 100mm f/2.0 on a full frame camera, as the absolute diamter of the entrance pupil is 50mm in both cases. An f/2.2 lens gives completely different results on a cell phone camera as a DSLR, as the focal lengths involved are very different.
Apr
9
comment Does getVerticalViewAngle() give actual Camera Angle Field Of View(CAFOV) value?
The image will have been cropped slightly by the demosaicing process, though probably not enough to account for 1.8 degrees, so either the value returned by the function is not accurate, or your measurements are not accurate, or a combination of both
Mar
27
comment Lightroom - Vivid faces effect
It's [colloquially] called the "Dave Hill Effect", or at least it used to be, and you achieve it in the studio, not in Lightroom. See this question for more info: photo.stackexchange.com/questions/4710/…
Mar
23
comment How can I further decrease the exposure in a studio environment?
Twice the distance is 1/4 of the light, which makes this a very effective method to reduce the light level.
Mar
21
comment Does the size of blower matter to clean the sensor of the camera?
It's not the size of the blower, it's what you do with it that counts.
Mar
19
comment How to shoot a reflection in a ball bearing without appearing in it?
Put the camera on a self timer and leave the room ;)
Mar
18
comment How weatherproof is an average modern lens?
@MichaelClark A better way to phrase the question might be: "How weatherproof are modern lenses like the Panasonic 14-140mm?"
Mar
17
comment How can I target a specific size in megabytes when saving a JPEG in Photoshop?
@PhilipKendall If you read the whole answer it's clear ths is referring to minimum filesizes as being a meaningless measure.
Mar
17
comment How can I target a specific size in megabytes when saving a JPEG in Photoshop?
Great answer overall, but to be pedantic the statement "There is no way you could produce a 20mb file from eg. a plain white image, no matter the dimensions" is not true. JPEG divides the image up into 8x8 or (16x16) blocks for compression. It has to store some data per block even if there's no detail. The maximum dimensions supported by the JPEG format are 2^16 - 1. Creating a 65535 x 65535 plain white image in Photoshop and saving as a JPEG resulted in a 272MB file. You could go even larger using the progressive option, but I didn't have enough memory available to perform that operation!
Mar
16
comment Why doesn't a drastic change in aperture seem to have an effect on this city skyline photo?
Note that the calculator you've linked to by default gives values for what appears to be in focus when viewing a small print. If you view the image at 100% on a computer screen the depth that appears to be in focus will be much smaller.
Mar
11
comment What kind of lens is typically used for these type of night street shots?
Those shots would look very different with a telephoto lens, there wouldn't be nearly as much content in the background, to get that specific look you need a wide-ish ultrafast lens and a full frame DSLR (or larger format).
Mar
11
comment How would an experienced photographer have taken this shot of a man selling old stuff in a city market?
A "pro" is someone for whom photography is their primary source of income...
Mar
9
comment What kind of lens is typically used for these type of night street shots?
@juztroublez it would only be "equal" in terms of angle of view, not in other factors, such as depth of field or background blur. See this question: photo.stackexchange.com/questions/22671/…
Mar
9
comment What kind of lens is typically used for these type of night street shots?
Almost certainly not a zoom, given the depth of field, I think you're looking at a 50mm f/1.4 here.