Fresh Dew on a Rose

by adarsha joisa

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96,800 reputation
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bio website mattgrum.com
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visits member for 4 years, 4 months
seen 2 hours ago

7h
answered How does a stitched panorama compare with a wide-angle lens?
9h
answered Is there a rule for something like “footroom”?
22h
comment How does autofocus deal with the time to change aperture and raise mirror?
@AlecTeal I'll see if I can dig out some Canon AF system white papers, I remember them talking about coping with objects that stop / start and move erratically which implies nonlinear motion estimation.
1d
comment Comparison of DOF between a 30mm f/1.4 and a 35mm f/2 lens
When you match the framing by moving the 35mm further away to compensate for the narrower FOV total DoF changes to 0.32m
1d
answered Comparison of DOF between a 30mm f/1.4 and a 35mm f/2 lens
1d
answered How do I blur the background around an object in post-production?
1d
answered How does autofocus deal with the time to change aperture and raise mirror?
Jan
23
comment Technical book or resource (non-creative)
You wont find good answers to all these questions in one book, as they range from the trivial (design of lens hoods) to basic optics (origins of chromatic aberration / limitation of single element lenses) to very complex (causes of onion ring bokeh, something I've yet to see a convincing explanation of from anybody, but may involve the construction techniques of aspheric elements, which is itself a high level topic)...
Jan
22
awarded  Nice Answer
Jan
22
revised Is there a correct way to swap lenses?
added 35 characters in body
Jan
21
revised Is there a correct way to swap lenses?
added 23 characters in body
Jan
21
comment Is there a correct way to swap lenses?
@Szabolcs There's a difference between dust and sand, for sure, having had a lens mechanism ruined by a single trip to the beach my advice in that area would be "don't take your camera to the beach!" But if you really want to do so then you'd be well advised to change lenses in complete isolation, in your car, or inside a bag at the very least.
Jan
21
comment Is there a correct way to swap lenses?
@ChrisH I've always done the method of getting the new lens on immediately after the old one comes off, on the basis that it's easier to brush dust of the rear element than it is to remove it from the camera body. Either method is acceptable though.
Jan
21
comment Is there a correct way to swap lenses?
It really depends on what your priorities are, but dust will happen. In my opinion you're better off having a cleaning strategy, and then change lenses as often as you need to get the shot, rather than trying to minimise how often you change lenses.
Jan
21
answered Is there a correct way to swap lenses?
Jan
21
comment Is there a correct way to swap lenses?
With regards to 4, there are scores of people, myself included who have been changing lenses with the camera on for decades. I have yet to hear of a single case of this resulting in any damage, if there was a risk there would surely be at least one case.
Jan
20
comment Is it risky to change lenses in the cold?
@JonStory I always use a bag these days. Neither the lens nor camera body are airtight in general, so the interior is exposed (to an extent) as soon as the camera is indoors. Also I've seen condensation form very quickly on the lens front element / camera LCD screen. This water can easily run through joins in the camera/lens if it's they're not weather sealed.
Jan
19
awarded  Enlightened
Jan
19
awarded  Nice Answer
Jan
19
answered Is it risky to change lenses in the cold?