Time to be with your loved ones

Time to be with loved ones

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88,149 reputation
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bio website mattgrum.com
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visits member for 3 years, 7 months
seen 9 hours ago

Mar
13
comment What does the pentaprism/pentamirror do?
@ChinmayKanchi the short answer is that you have to project the image onto something to check focus. Early film SLR screens were ground glass, with a clear split prism in the centre. DSLR screens are laser etched glass with no focus aid but the principle is the same.
Mar
13
awarded  Nice Answer
Mar
13
revised What does the pentaprism/pentamirror do?
added 86 characters in body
Mar
13
comment What does the pentaprism/pentamirror do?
@nitro2k01 there are two reflecting surfaces inside a regular pentaprism, but three inside a roof pentaprism. That diagram is side on and so doesn't show that one of the reflecting surfaces is split in two.
Mar
13
revised What does the pentaprism/pentamirror do?
added 2 characters in body
Mar
13
revised What does the pentaprism/pentamirror do?
added 46 characters in body
Mar
13
answered What does the pentaprism/pentamirror do?
Mar
12
comment What is the basic relationship between aperture and focal length?
The title is asking a completely different thing to the body of the question!
Mar
10
comment HDR with movement
see also this question/answer: photo.stackexchange.com/questions/3394/…
Mar
10
comment HDR with movement
Did you read my answer to the linked question? Basically, the best option is going to be to manually blend the exposures. This will be quite effective if the areas containing movement fit within the DR of one exposure. See this answer for more detail about manually blending exposures to extend DR: photo.stackexchange.com/questions/3/…
Mar
10
comment Best and cheapest lenses for wildlife photography?
The best and cheapest lenses for wildlife are two disjoint sets.
Mar
9
awarded  Nice Answer
Mar
8
awarded  low-light
Mar
7
answered Will using a CTO gel help make my flash less distracting in a cafe?
Mar
6
comment Why human eye doesn't exhibit aberrations?
Single lens systems are very bad at projecting onto a flat surface like a digital camera sensor. They are much better at projecting onto curved surfaces like the retina. As soon as affordable curved sensors are perfected expect some very low aberration lenses!
Mar
6
awarded  Nice Answer
Mar
6
revised Why don't cameras have autofocus points in the edges and corners?
added 279 characters in body
Mar
6
answered Why don't cameras have autofocus points in the edges and corners?
Mar
6
comment Why don't cameras have autofocus points in the edges and corners?
-1 It's neither of those reasons
Mar
6
comment Why don't cameras have autofocus points in the edges and corners?
@FredP no - it's an physical limitation, not an arbitrary decision by manufacturers