#3 with this new (used) lens

[maxroadrash]

I figure it's really a 270mm on my D200...

 

[Braineack]

no it's really a 180mm lens.

 

[tirediron]

It will give you the field of view equivalent to a 270mm lens (more or less) on a full-frame camera, but as Braineac indicates above, the focal length doesn't change and the characteristics of the lens don't change.

 

[maxroadrash]

Yes you are correct but it crops to about that on the D200 I believe.

 

[480sparky]

If I take a photo with a 180mm lens, print it, then cut up the print with a pair of scissors, it was still taken with a 180mm lens.

You have a 180mm lens. The camera it's used on does not change that.

 

[maxroadrash]

OK, yes it's still a 180. The area captured by the smaller sensor is smaller. The EFFECT is approximately the same as using a 270mm on a full frame camera.

 

[480sparky]

Well, technically, no. The DOF would be different using a 270mm on a FF camera.

 

[maxroadrash]

yes, that's obvious. Aside from that...

 

[Braineack]

It's just a pointless thing to say/worry about.

That's like saying your go-kart is technically a Ferrari because it has the same power:weight.


Looks like a cool lens.