Lightnings taking a ride

by ceinmart

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bio website mattgrum.com
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visits member for 4 years, 11 months
seen 17 hours ago

Aug
24
awarded  Enlightened
Aug
24
awarded  Nice Answer
Aug
24
comment Given the same sensor size lens, will a higher megapixel sensor give more “reach” then a lower one?
@HenkHolterman "perceptual megapixels" is a misleading and gross oversimplification invented by DxO labs. A budget prime from the 1970s can resolve more than enough detail to make use of a 36MP sensor.
Aug
24
answered What are similarities and differences between raw editing and film developing capabilities?
Aug
24
comment How to test whether two RAW files have identical contents (but potentially different tags)?
@Mehrdad provided you work in a 16-bit space this ought to work - any changes you make to a 14-bit RAW file will show up in a 16-bit conversion. You can make any binary difference visible by using the levels/curves tool. The only downside to this is that some RAW converters discard edge pixels so the image you get is marginally smaller than the actual number of pixels on the sensor.
Aug
19
comment How can I stop my HDR shots looking so fake?
@Pacerier Photomatix for the first one, Photoshop for the second one. Non-pirated, of course.
Aug
18
awarded  Enlightened
Aug
18
awarded  Nice Answer
Aug
17
comment What is the relationship between focal length and minimum focus distance?
The focal length of a lens doesn't change when adding an extension tube.
Aug
17
answered What is the relationship between focal length and minimum focus distance?
Aug
17
comment Shooting video frame by frame / electronic vs mechanical
Actually a lot of early DSLRs with CCDs particularly Nikons did have electronic shutters.
Aug
13
awarded  Guru
Aug
6
comment Why is a Bayer filter with three colors(RGB) preferred over one with two colors and unfiltered (RBNeutral)?
@BrianKubera He's talking about the Fuji Super CCD SR: dpreview.com/articles/6851251325/fujisuperccdsr
Aug
5
revised Why is a Bayer filter with three colors(RGB) preferred over one with two colors and unfiltered (RBNeutral)?
added 138 characters in body
Aug
5
answered Why is a Bayer filter with three colors(RGB) preferred over one with two colors and unfiltered (RBNeutral)?
Aug
5
comment Why is a Bayer filter with three colors(RGB) preferred over one with two colors and unfiltered (RBNeutral)?
@DigitalLightcraft you could indeed calculate the green value, the sensor will already have IR and UV blocking filters in front of it. This is in essence how the Foveon sensor works, the top layer is sensitive to red, green and blue.
Aug
4
comment How can I tell what focal length a zoom lens was set to for a photo of the moon?
@PhilipKendall lens reporting of focal length isn't always that accurate as there aren't usually that many sensors on the lens barrel...
Aug
2
comment Why don't we have a single lens e.g. say a 18-200 f/1.2 lens for the SLR camera?
@BrandonDube Do you know how the Zeiss 1700mm f/4 is able to cope with the huge exit pupil and H-mount throat? Also do you have any idea what would happen if you took Sigma's 500mm f/2.8 and mounted a 2x focal reducer? Seems like that would get you to 250mm f/1.4 albeit with a much smaller image circle.
Jul
30
comment Why don't we have a single lens e.g. say a 18-200 f/1.2 lens for the SLR camera?
Are you confusing entry and exit pupils? You can buy a 600mm f/4 today and that has a 150mm opening, so 166mm is not a stretch. Lens mounts have nothing to do with it. There's nothing "physically impossible" about an 18-200 f/1.2 at all, it would simply by very, very heavy and expensive.
Jul
29
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