| Joined: | Thu Apr 19th, 2012 |
| Location: | United Kingdom |
| Posts: | 4435 |
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Eric,
re: why
Theoretically, as AF systems need light and contrast:
-any zoom will have (due to more elements in the lens) have less contrast
-most zooms do not have the same max. aperture as some primes
Regards, Gilbert
Thank you. I suppose whilst I recognised that those differences influence the ability to lock on focus or not.... yes or no....black or white, I had never considered that the 'speed' of that focus acquisition was part of the process. I guess it's logical that it's all related.
Last edited on Mon Aug 31st, 2015 18:02 by Eric
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Eric