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bio website mattgrum.com
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visits member for 4 years, 3 months
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Oct
14
comment Do I use the crop factor in calculating aperture size and area?
@BBking it is right, you do obtain the real focal length by dividing the 35mm equivalent length by the crop factor compared to 35mm (e.g. Nikon 1 kit lens is a 27-80 equivalent, divide by the crop factor (2.7) and you get 10-30mm which is what's printed on the lens barrel). I could change the answer but the question specifically asked how to calculate the aperture size when you have an equivalent focal length for real f-number.
Oct
14
awarded  Nice Answer
Oct
14
comment Do I use the crop factor in calculating aperture size and area?
@BBking read the question again, the lens has a 50mm FF equivalent field of view on a 1.5x crop sensor, hence it's really a 33mm lens, hence the entrance pupil diameter (on all formats) is 11.9mm
Oct
14
answered Do I use the crop factor in calculating aperture size and area?
Oct
10
awarded  Good Answer
Oct
10
answered Viewfinder coverage: is it area or angle of view?
Oct
10
comment Viewfinder coverage: is it area or angle of view?
@laurencemadill that's right, but I think the question is asking whether you 95% of the image area, or 95% of the image width.
Oct
10
awarded  Nice Answer
Oct
9
answered What's the use of exposure bracketing in film cameras?
Oct
9
comment Infinity focus problem
@user1207217 If the lens is indeed fully manual then what you see in live view should be pretty much what you get. In any case the final resulting image should be sharper than the live view image. I cannot think of any reason for it to be the other way round, unless shutter speed was a factor (the image you posted shows no signs of motion blur). How was the second image obtained? Was it a cell phone picture of the camera's LCD screen or did you download the image from the camera's memory card?
Oct
8
answered Infinity focus problem
Oct
4
awarded  Nice Answer
Oct
2
comment Auto focus vs Single Continuous/Point focus
Practice makes perfect :)
Sep
30
awarded  Explainer
Sep
27
answered Measure rolling shutter severity of image sensor scientifically
Sep
26
comment What settings should I use to take a burst at the highest possible FPS?
In short, noise reduction, card write speed and particularly autofocus have been shown to have a measurable impact on continuous shooting speed. Metering has not.
Sep
26
comment What settings should I use to take a burst at the highest possible FPS?
@MichaelClark The 1DX has a 100,000 pixel metering sensor which has it's own dedicated DIGIC4 processor (which can crunch through (demosaic, apply filters and reencode) the 5DII's 22,000,000 pixels with ease). Reading 100,000 pixels (no need to do any demosaicing) and performing a lookup is a breeze for an application specific chip designed to do nothing other than process pixels. Even if it takes as long as a microsecond then that's going to be well within the accuracy to which most people can measure the shooting speed!
Sep
26
comment Approximating a wide XPan shot
Shoot wide with a rectilinear lens and crop is bay far the simplest solution. It's worth noting that you don't have to spend a lot to get a wide prime these days (the Sam/Rock/Bow/Yang 14 f/2.8 is a steal), nor do you need a full frame camera, there are 10mm options (prime and zoom) available for APS-C!
Sep
26
comment What settings should I use to take a burst at the highest possible FPS?
I'd be amazed if metering calculations slowed down the shooting speed given that's it's done using an ASIC where 1/10th of a second is an eternity.
Sep
25
comment Is it assured that every type of lens will be made for a given interchangeable lens camera?
I wouldn't say it's extremely remote, look at what Sony is doing to the A-mount, (and of course what Canon did to the FD mount). What's going to happen when EVFs and CDAF advance past OVFs and PDAF? What about when curved sensors become cheap enough to have on in every lens? There are many reasons to abandon a mount, when it makes commercial sense Canon will do it.