Generic Really Retarded Question
Posted 28 January 2006 - 10:57 PM
Posted 28 January 2006 - 11:09 PM
Is there a real difference between buying one zoom lens say 10-100 and a set of primes 10-25-50-75 whatever. And by difference I mean a quality difference on the final image - assuming that both lenses are new and of the highest quality -
The zoom will have twice the number of elements. That normaly is is not good for contrast and sharpness. Also the zoom will be bigger and hevier than each individual prime lens.
Modern lenes hae features like Multi-coating that can reduce many of the negative effects of the more complicated lens. Of course they also make the prime lenes even better. (Newer prime better than an older prime) You might find you can get better results from a newer Zoom comparied to an older prime.
My Filmo has a cooke Ivotal 2 inch that looks absolutly opaque compaired to a pentax SMC lens for example. (both 50mm f1.4)
On the plus side, a zoom is lighter than a case full of primes, and can be set to the useful focal length with a twist of the wrist. (that is why they have always been popular with sports and news folks.)
Posted 28 January 2006 - 11:18 PM
The standard answer to this question now, as it always was, and probably always will be, is:
" Untill recently, zoom lenses were not of the same optical quality............."
Posted 29 January 2006 - 12:54 AM
Posted 29 January 2006 - 01:00 AM
Of course speed is an issue, not so much that zooms aren't fast enough, but that I don't like shooting any lens wide open; I like to stop them down a little. So if you have a zoom that only opens to T/3.1, it probably won't behave its best until stopped down to a T/5.6. Whereas with a T/2.0 prime, I can stop them down to a T/2.8 or more and get the better performance.
Posted 29 January 2006 - 03:58 AM
Posted 29 January 2006 - 11:56 AM
What's the main reason for a lens not being it's sharpest when wide open??
Partially because it's been designed that way. If your lens goes from T/2.0 to T/16, you probably want to make its optimal performance to be closer to the middle of the lens aperture choices, or about two stops closed from wide-open. Also, a big aperture just makes it harder for the rays of light to come into focus -- the image starts to look mushy. This is one reason why the new Zeiss Master Primes are so impressive, because they are sharp and crisp at T/1.4, wide-open.
Posted 30 January 2006 - 08:30 AM
Posted 01 February 2006 - 01:06 PM
"Groovy" - Ash
Edited by Stephen Lamb, 01 February 2006 - 01:07 PM.
Posted 18 August 2008 - 04:28 PM
And how often do you have to have this done?