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Old Jan 3, 2005, 6:16 AM   #11
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also i have just seen the af-s lens, i hear this is alot alot quicker at focusing than af? i have only tryed af-s lenses so far so cant comment
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Old Jan 3, 2005, 8:27 AM   #12
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JoeB_UK wrote:
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also i have just seen the af-s lens, i hear this is alot alot quicker at focusing than af? i have only tryed af-s lenses so far so cant comment
Yes -- you should get faster focusing on most bodies.

The AF-S Lenses incorporate a "Silent Wave Motor" inside of the lens, that lets them focus faster and quieter.

Sigma's HSM (Hypersonic Motor), and Canon's USM (Ultrasonic Motor) lenses have similar technology.
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Old Jan 3, 2005, 2:28 PM   #13
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Ok, i have only used af-s (kit lens and the 70-200mm 2.8) so i am wondering how slow a af lens would be? i will have to go to a store and test one soon:|
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Old Jan 3, 2005, 5:19 PM   #14
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Back to the question of if a teleconverter degrades optical performance, any additional pieces of glass and the extra glass/air interfaces add to degradation and the potential for flair. The effect is less noticeable using high quality lenses and matched teleconverters. The Canon matched 1.4x and 2x converters cost as much if not more that the canon 70-300usm lens.

This image degradation includes that wonderful 20$ piece of glass every camera sales person tries to sell you to protect your 1000$ lens. (I'm not against using filters when there is a real need for them)
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Old Jan 4, 2005, 5:15 PM   #15
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Thanks guys, i am really enjoying my new d70 its just a shame the weather sucks round here, which doesnt give me much time to go shooting
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Old Jan 5, 2005, 2:53 PM   #16
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Ok so af lenses are effected by the body (speed).

so if i was to buy either
Nikon (Nikkor) 80-200mm 80-200 f/2.8D ED AF Lens
OR Sigma APO 70-200mm (70-200) f2.8 EX AF HSM - Brand New

and put on a d70 how fast would it be say compared to a af-s
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Old Jan 5, 2005, 4:29 PM   #17
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The Sigma lenshasthe HSM which is equivalent to Nikon AF-S. It will focus as fast or even faster ( because F2.8 )then theNikon18-70mm lens.

The Nikon 80-200 should be a little bit slower, but the latest version of it is known to be a good focuser as well.
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Old Jan 5, 2005, 4:39 PM   #18
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wow thats great news why is there such a price difference in the sigma which is like 380£ whilst the nikon af-s is like 1000£ (is this due to vbr?)
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Old Jan 6, 2005, 9:22 AM   #19
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VR + the Nikon is built like a tank
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Old Jan 6, 2005, 11:26 AM   #20
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yeah it did feel good when i tested! i will be shooting sports so i wont need vbr, do you think the sigma is a good choice?
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