Hi,
i have been comtemptating for a while now of getting a constant F2.8 zoom lens eg Tokina 28-70 ProSV that's on offer... but could never find a compiling reason to do so...
i know the constant F value is fast and is bright... and good in taking low light situation... can someone quote a couple of example?
if i up the value of the lens on my camera to say F8... and compare this to a normal 28-70 at F8(non constant lens), what is the difference?
I also noticed that while the F2.8 is constant, using Shuttle priority, the value of time brinks on i up the value for nightshots.... does it mean the shot will be grossly underexposed.. so what's the use of a fast lens in thiis situation and how do i compensate for it to get a correct exposure...
and if i still take the pic when the value brinks, the exposure will be wrong, right?
Thank you in advance for teaching...
i have been comtemptating for a while now of getting a constant F2.8 zoom lens eg Tokina 28-70 ProSV that's on offer... but could never find a compiling reason to do so...
i know the constant F value is fast and is bright... and good in taking low light situation... can someone quote a couple of example?
if i up the value of the lens on my camera to say F8... and compare this to a normal 28-70 at F8(non constant lens), what is the difference?
I also noticed that while the F2.8 is constant, using Shuttle priority, the value of time brinks on i up the value for nightshots.... does it mean the shot will be grossly underexposed.. so what's the use of a fast lens in thiis situation and how do i compensate for it to get a correct exposure...
and if i still take the pic when the value brinks, the exposure will be wrong, right?
Thank you in advance for teaching...