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Nikkor glass on cropped 7D sensor

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John Young
Nikkor glass on cropped 7D sensor
on May 22, 2011 at 3:38:23 pm

I am not sure why I have been unable to figure this out, but I have searched around a lot and haven't got what I am looking for. So I turn to you good folks on the COW.

I have a Canon 7D, so it has the 1.6x cropped sensor. I also recently got a great Nikon Nikkor 50mm Ai lens off ebay. I assumed the lens would be closer to 80mm because of the crop factor on the 7D's sensor. But I don't think this is the case. I compared it to my Canon EF-S (so the lens is made for crop sensor) 17-55mm. And the Nikon 50mm looks pretty close to the Canon at 55mm. Pictures below.

This is the Canon lens at 55mm.
a href='http://i1.creativecow.net/u/130999/canon55mm.jpg'>

This is the Nikon 50mm
href='http://i1.creativecow.net/u/130999/nikon50mm.jpg'>

It looks like the Nikon is true 50mm. Right? What am I not understanding about this?
All thanks in advance.

http://www.johnathanyoung.com


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Errol Lazare
Re: Nikkor glass on cropped 7D sensor
on May 22, 2011 at 4:45:15 pm

The 50mm Nikor looks very close the the 55 canon lens but looks to be a bit wider (since it is 5mm smaller). But because you are using a crop sensor that 50 would really be around an 80/85. If you put that on a 5d it would be much wider. It shouldn't matter what brand of lens you are using because a 50mm on a Nikor is a 50mm in general.
Try throwing a 35mm lens onto your crop sensor camera to give you an idea what your 50mm would look like on a fullframe camera

Errol X. Lazare
EXL Films
http://www.exlfilms.com


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Noah Kadner
Re: Nikkor glass on cropped 7D sensor
on May 22, 2011 at 7:00:34 pm

Yeah the EF-S 50mm still gets cropped as a regular lens would. Can't change the physics...

Noah

Unlock the secrets of 24p, HD and Final Cut Studio with Call Box Training. Featuring the Panasonic GH2 and Canon 7D.


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John Young
Re: Nikkor glass on cropped 7D sensor
on May 23, 2011 at 5:14:52 pm

[Errol Lazare] "The 50mm Nikor looks very close the the 55 canon lens but looks to be a bit wider (since it is 5mm smaller). But because you are using a crop sensor that 50 would really be around an 80/85."

That is why I am confused. It looks likes it is only 5mm wider, when I would think it would tighter (like the 80/85mm you mentioned).

So then I can come to 2 conclusions, neither which make sense to me.
1) My Canon EF-S 17-55 is not true 17-55. But the B & H info states clearly it is not for full frame sensors, it is made for APS-C sensors

2) For some reason the Nikon 50mm is closer to actual 50mm than the 80mm it should be on the cropped sensor, but I have not idea why.

Thanks guys.

http://www.johnathanyoung.com


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Brent Dunn
Re: Nikkor glass on cropped 7D sensor
on May 23, 2011 at 5:50:44 pm

The bigger lens are wider glass, but the cropped sensor is similar to being zoomed in a bit.

You can have a piece of glass 3 inches wide and look through a 2 inch hole, you only see 2 inches of the glass. You can then get a 4 inch piece of glass and look through the 2 inch hole, it looks the same even though the glass is bigger. This ends our lesson for today class : )

Brent Dunn
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Colin McQuillan
Re: Nikkor glass on cropped 7D sensor
on May 23, 2011 at 7:31:16 pm

Basically what 'Professor Dunn' is saying is that your 17-55mm lens, that is made specifically for an APS-C sensor, is going to give you the same framing on your APS-C body as 17-55mm lens that is made for a full sensor camera.

a 50mm lens is a 50mm lens. Some are less wide inside and can't be used on a full-frame camera (well,, you can for interesting boarder effect..)
The difference is that the APS-C lens uses smaller diameter glass.

The mentality behind this is that the APS-C lenses cost less to build, and thus cost less to the consumer...

In the end I always go for the full frame lens' to future proof new bodies down the road.

Colin McQuillan
Vancouver, B.C.


"Live, love, laugh and be happy."


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