Westminster fountain at sunset

by Jorge Córdoba

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

1,850 reputation
615
bio website
location
age
visits member for 3 years, 10 months
seen 6 hours ago

Mar
28
answered Laser Printers: Widest Pantone Gamut?
Mar
28
answered How many colors and shades can the human eye distinguish in a single scene?
Mar
24
comment Is the Manfrotto 190XPROB a good first tripod for a student with an entry-level DSLR?
According to Manfrotto, the 496 head will carry a 6Kg load. It should be easily able to cope with the XTi with 18-55 lens. Martin may have been referring to the 494 which is designed for a 4Kg load. That probably can't cope well with large telephoto lenses but the 18-55 would be OK I would have thought.
Mar
24
comment Is the Manfrotto 190XPROB a good first tripod for a student with an entry-level DSLR?
@Miriam: With the centre-column raised, the 190 is 1.46m high, the 055 is 1.77m high. If you are 5' 3" the 190 will be perfect. The height of the head and of the camera added to this will bring the viewfinder up to my eye-height when I am standing fully upright. There are carbon-fibre versions which reduce the weight by about half a kilo (but are more expensive).
Mar
24
answered Is the Manfrotto 190XPROB a good first tripod for a student with an entry-level DSLR?
Mar
11
comment Will any of my old Nikon gear be compatible with a D3100?
Nikon's web-site has a D3100 Lens Compatibiity page which provides this information
Feb
19
revised Why is the aperture ring removed from new Nikon lenses?
deleted 101 characters in body
Feb
19
comment Why is the aperture ring removed from new Nikon lenses?
@MainMa: Thanks for the comment, I've removed that part of my answer.
Feb
18
answered Why is the aperture ring removed from new Nikon lenses?
Feb
15
awarded  Nice Answer
Feb
10
comment What's the difference between the Canon and Nikon lenses mounts?
Nikon have an F-mount 50mm f/1.2 lens, (though it is non AF) - Perhaps you mean 50mm f/1.0
Feb
7
answered Metering - How to account for the light from the flash
Feb
3
comment Why is 1:1 desirable for a macro lens?
“I don’t know what you mean by ‘glory,’ ” Alice said. Humpty Dumpty smiled contemptuously. “Of course you don’t—till I tell you. I meant ‘there’s a nice knock-down argument for you!’ ” “But ‘glory’ doesn’t mean ‘a nice knock-down argument’,” Alice objected. “When I use a word,” Humpty Dumpty said, in a rather a scornful tone, “it means just what I choose it to mean—neither more nor less.”
Feb
3
comment Why is 1:1 desirable for a macro lens?
1:1 is arbitrary. The number 1 has obvious mathematical and numerological significance but there's nothing optically special about the macro ratio 1:1 other than the ease of measuring it. It certainly isn't "a line in the sand" as that means a metaphorical point beyond which no advance is accepted or made. Lens makers such as Canon have advanced beyond 1:1
Feb
1
comment What are the ways to print my 10-bit per color files?
@jrista: so are you saying that many of those 10 bits expended on hue and saturation are wasted and 10 bits may be insufficient for luminance?
Feb
1
awarded  Commentator
Feb
1
comment What are the ways to print my 10-bit per color files?
@jrista: The source I quoted included luminance or brightness in the calculation - "1,000,000: the number of colors (combinations of hue, saturation and brightness) that the eye can discriminate under optimal laboratory conditions." If increased bit depth was more about levels of brightness then couldn't we adequately represent perceivable colors with (say) 6-bits of hue, 6-bits of saturation and 12-bits of value? So far as I know, no cameras, software or output device follows an asymmetric model.
Feb
1
revised What are the ways to print my 10-bit per color files?
added 74 characters in body
Feb
1
answered What are the ways to print my 10-bit per color files?
Feb
1
comment What are the ways to print my 10-bit per color files?
"A device that is able to reproduce the entire visible color space is an unrealized goal within the engineering of color displays and printing processes. While modern techniques allow increasingly good approximations, the complexity of these systems often makes them impractical." - Wikipedia