Red and Blue

by Gordon

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36,621 reputation
140105
bio website throughaglassdarkly.zenfolio.…
location Decatur, AL
age
visits member for 2 years, 3 months
seen 1 hour ago

1d
revised Nikon D5100 potential auto focus issue
edited tags
1d
awarded  telephoto
1d
answered Nikon lens upgrade question
1d
revised Will a macro extension tube eliminate the cropping of an APS-C lens on a full-frame sensor?
added 250 characters in body
1d
comment Why isn't it safe to use EF-S lenses on fullframe?
And you would then lose the ability to ficus much further than the Macro working distance of the lens/tube combination.
1d
comment Will a macro extension tube eliminate the cropping of an APS-C lens on a full-frame sensor?
It is worse than that. To offset an image circle that is 2/3 the size needed, you must increase the focal length to 3/2 the lens' original focal length.
1d
answered Will a macro extension tube eliminate the cropping of an APS-C lens on a full-frame sensor?
2d
comment Issues in long exposure photography
The need to turn VC/IS/VR/OS off when using a tripod really depends on the lens in question. Many newer stabilised lenses can auto sense when they are tripod mounted and take it into account. A few, such as the newest members of Canon's Super Telephoto series, even have IS modes designed specifically to counteract mirror slap when the lens is tripod mounted.
2d
comment Issues in long exposure photography
If you are trying to shoot stars with the relatively longer focal lengths of a 70-200mm lens, assuming an APS-C body, any shutter speeds longer than 2 (200mm) to 5 (70mm) seconds will result in motion blur due to the earth's motion relative to the stars in the sky.
May
19
revised Moving up to the next lens from 55-200
added 259 characters in body
May
19
awarded  portrait
May
18
comment What determines the fastest shutter speed for an electronic shutter?
Probably the reason it is never stated is that it isn't very relevant. High speed photography uses the flash duration, not the shutter speed, to freeze motion.
May
18
awarded  Enlightened
May
18
awarded  Nice Answer
May
17
comment Looking for a new telephoto lens for Canon T2i
Here is a survey of what your options are in terms of an upgrade path from the 55-250. To get significantly more reach (beyond 300mm) will require a substantial expenditure. photo.stackexchange.com/a/40730/15871
May
17
answered Turning the smaller eye away from the lens?
May
17
comment What determines the fastest shutter speed for an electronic shutter?
For high speed photography the solution has usually been to not worry about the shutter speed, but rather to control all of the light illuminating the scene in precisely timed short bursts while the shutter remains open a longer period of time. If you have a burst of light only 1/10,000 second in duration and the room is otherwise totally dark, then it doesn't matter if the shutter is open for 1/250 second. The only time light will strike the sensor is in the 1/10,000 second the light is shining.
May
17
comment What determines the fastest shutter speed for an electronic shutter?
See this link for how a mechanical shutter works at high shutter speed: youtube.com/watch?v=ptfSW4eW25g
May
17
comment What determines the fastest shutter speed for an electronic shutter?
Due to the way mechanical shutters record images shorter than the camera's sync speed, you will get rolling shutter artifacts if you use a typical mechanical shutter found in a DSLR. Although each spot on the sensor may only be exposed for a time interval as short as 1/8000 second, it typically still takes around 1/200 second for the slit between the first and second curtain to move across the entire sensor. The same is true of some electronic shutters that read out sequentially (i.e. from top to bottom of the sensor).
May
17
revised Do I need clear or opaque plexiglass for my product photography?
edited title