Nikon Question.

Lester

Lester

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Lester
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Hi, I have a D90 and among other lens a Nikon 70-300mm lens. I've been told that due to the sensor (I think) that the range can be increased by 50%, making my 300mm go to 450mm. Is that a setting on the camera I need to do to implement this or is it done automatically? If I need to do something on the camera, what is it called so I can look it up in the manual or better still where on the camera? I've had a look through the manual, but without knowing what this is called its a bit difficult to find it or to search on here, incase someone has already asked this before. Sorry if my question seems a vague or has been asked before.
 
Lester said:
Hi, I have a D90 and among other lens a Nikon 70-300mm lens. I've been told that due to the sensor (I think) that the range can be increased by 50%, making my 300mm go to 450mm. Is that a setting on the camera I need to do to implement this or is it done automatically? If I need to do something on the camera, what is it called so I can look it up in the manual or better still where on the camera? I've had a look through the manual, but without knowing what this is called its a bit difficult to find it or to search on here, incase someone has already asked this before. Sorry if my question seems a vague or has been asked before.
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there is no switch that does this on your camera - it happens because of the smaller size of the sensor.

Lens focal lengths are quoted as if mounted to a 35mm or FX body. Because of the smaller size of a crop sensor the field of view is equivelnt to a 50% longer lens on 35mm so your 70-30 becomes like a 105-450 on 35mm. (The focal length doesn't change just the field of view). I'm sure you can see pluses and minuses to this
 
You have a crop sensor which means that you see only the middle section of the image giving the equivalent focal length of 1.5x what you stick on the front.

So if stick a 50mm lens on my D700 (full frame) then you get the same image on your D90 but the middle part of of ie what I would get if I cropped out the middle section.

There is no "setting", that is just how your camera is all the time.
 
Thanks for the replies and I think I understand it better now.

I'm after a longer lens and I was hoping to get away with what I already have.
 
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