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Small Sensor Crop Factor (DX Lens Crop Factor)

John Lai , Jun 19, 2008; 01:20 p.m.

Sorry guys if this topic has been discussed before but I am still a bit confused about the DX's 1.5x crop factor.

A 18-200mm VR DX lens means 18-200mm right? A 70-300mm VR Lens (not DX) means 70*1.5 - 300*1.5 mm right?

Lets say if there is a 18-200mm VR lens and a 18-200mm VR DX lens, I would be able to get 18*1.5 - 200*1.5x mm on the non-DX lens?

Thanks in advance.



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Justin Carlson , Jun 19, 2008; 01:24 p.m.

Response to DX Lens Crop Factor;

Nope, you apply the crop factor to ALL lenses... even DX branded ones.

Stephen Lewis , Jun 19, 2008; 01:29 p.m.

Response to DX Lens Crop Factor;

Don't think of the lens as doing the cropping...that is the sensor. The DX lenses merely are designed to spread the light onto the smaller sensor rather than a larger one (simplistic explanation ignoring other characteristics).

Wayne Cornell , Jun 19, 2008; 01:40 p.m.

Response to DX Lens Crop Factor;

A lens that is 24mm on a film camera still is a 24mm lens on a digital camera with a 1.5 factor. The difference is that the digital camera crops the FIELD OF VIEW to what a 36mm lens would see. You are only using the the center 2/3 of the lens.

S.G. Bono , Jun 19, 2008; 01:44 p.m.

Response to DX Lens Crop Factor;

Isn't the "crop factor" [equivalent field of view] 1.6x, not 1.5x, on an APS-C sensor? It's 1.5 on a 4/3-system sensor.

S.G. Bono , Jun 19, 2008; 01:45 p.m.

Response to DX Lens Crop Factor;

Sorry, senior moment! It's 2x on a 4/3 sensor.

Hans Janssen , Jun 19, 2008; 01:48 p.m.

Response to DX Lens Crop Factor;

crop 1.6x is with the other brand.....

Radford Neal , Jun 19, 2008; 02:11 p.m.

Response to DX Lens Crop Factor;

Nikon labels SLR/DSLR lenses by their actual focal lengths. They do not use "35mm equivalent" focal lengths, like some P&S cameras are labelled. They might have, but they don't. So "DX" is irrelevant in figuring out the field of view of a lens on a DX camera.

John Williamson , Jun 19, 2008; 02:47 p.m.

Response to DX Lens Crop Factor;

The "crop factor" is with respect to a 35mm film or full sized sensor. As was noted, it has nothing to do with the lens, really, but how much of the scene hits the sensor and how much is too wide or too tall and misses the sensor. This changes the field of view of the final picture. We say it has the equivalent view of a lens 1.5 times longer. So, a 50mm would end up with a field of view of a 75mm lens. Now, the issue comes when you put a DX lens, which is designed to only send light the same size as the digital sensor, on a full sized sensor or a film body. In this case it doesn't fill the whole space up, and you see that on the result.

Marc Weintraub , Jun 19, 2008; 03:04 p.m.

Response to DX Lens Crop Factor;

I'm gonna throw my hat in this too :)

If you put a 18mm FF lens on a DX body it will look the same as if you put the 18-200mm on the DX body and set the lens to 18mm.

But if you put that 18mm on a film camera, it would be much wider. Wider FOV.

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