AF-s

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Hi all.

Are the AF-s len's actually 50mm and so forth or if I want a 50mm len's I should buy a 35mm?

thanks Ben.
 
A 50mm lens is a 50mm lens regardless. It's the effective focal length that changes dependant on whether you're using full frame or a cropp sensor. On a 1.5x crop camera it's equivalent to 75mm (on a Canon it's about 80mm or so because they have a 1.6x crop).

It's all about how much of the image circle the sensor uses....
 
As above, really. Going on your D5000 being a crop sensor, a 35mm lens would act like a 50mm lens would on a full-frame camera :)
 
As above. The crop factor is really only relevant to those who come from a film background and need to know what their old lenses do on new digital cameras, in terms of numbers that they are familiar with.

A 50mm lens on a full frame camera (eg film) has an angle of view of 46 degrees. On your 1.5x crop Nikon, a 33mm lens provides the same angle of view (50/1.5=33).
 
hi all and thanks for the answers.
I want to useit as a portrait lens and have the wide aperature so i can blurr the backgrounds.

Ben.
 
For me personally I love my 50mm lenses, they give almost the ideal Fov for portraits, again personally for me the 30 odd mm lens will distort peoples features to much for me.
 
For the record, I love my 35mm lens on my D40x and as far as I can see suffers no distortion whatsoever.
 
Ian W said:
For the record, I love my 35mm lens on my D40x and as far as I can see suffers no distortion whatsoever.
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It's not the lens that suffers distortion, it's that if you get too close to the subject (such as if you want to fill the frame with a face using a 35mm lens) you will get perspective distortion which could make, for example, their nose look big.
 
Nawty said:
It's not the lens that suffers distortion, it's that if you get too close to the subject (such as if you want to fill the frame with a face using a 35mm lens) you will get perspective distortion which could make, for example, their nose look big.
Click to expand...

I understood what you meant, and meant that I hadn't noticed any distortion in any photos I've taken.
 
i used a 14-24 on my D200 yesterday which gave very amusing results when i moved in close to people :nuts:
even more surprising was how close i actually was when i took the camera down from my eye! i was nearly touching them :lol:
 
Tirpitz said:
i used a 14-24 on my D200 yesterday which gave very amusing results when i moved in close to people :nuts:
even more surprising was how close i actually was when i took the camera down from my eye! i was nearly touching them :lol:
Click to expand...

Using too wide a lens for portraits not only exagerates perspective in a usually unattractive way, it also means that you are shooting uncomforably close to the subject, and the wider field of view means there is loads more background visible behind which detracts from the subject.

All good reasons why a short/medium telephoto lens is (usually) favourite.
 
To the OP, the AF-S designator means the that the lens focus module is driven by a Silent Wave Motor; result being faster (and normally more silent) auto focus as opposed to lenses whose AF is dependant on a camera driving the autofocus.

Canon's equivalent is USM, and if I recall correctly sigma call theirs HSM. (Ultra Sonic Motor / Hyper Sonic Motor).

AF-S pretty much superceded AF-I that you can find on older lenses that support their own internal focus motor.
 
HoppyUK said:
Using too wide a lens for portraits not only exagerates perspective in a usually unattractive way, it also means that you are shooting uncomforably close to the subject, and the wider field of view means there is loads more background visible behind which detracts from the subject.

All good reasons why a short/medium telephoto lens is (usually) favourite.
Click to expand...

yeah i know, thats exactly why i was sticking an ultrawide lens in peoples faces :naughty:
for the more sensible shots the 50mm f1.4 was much better :thumbs:
 
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