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f-stop question on dSLRs
Ok... this is going to be the most ridiculous question ever but I thought that I'd ask..

I'm looking into getting a dSLR soon and was wondering how this worked. With an SLR you can change the lenses at any time and each lens has it's own f-stop range. How does the camera know what the lens is capable of? With a P&S the camera knows what lens is on the camera and adjusts accordingly. With a SLR how does that work?.

It's probably a simple answer but it was on my mind and I thought that I'd ask..

Thanks..

Comments (6)

Psychoegg wrote:.

Ok... this is going to be the most ridiculous question ever.

No, not by a long way....

I'm looking into getting a dSLR soon and was wondering how thisworked. With an SLR you can change the lenses at any time and eachlens has it's own f-stop range. How does the camera know what the lensis capable of? With a P&S the camera knows what lens is on the cameraand adjusts accordingly. With a SLR how does that work?.

The lens isn't a dumb piece of glass and metal. It has a chip in it and electrical connections to the camera to draw power, so the camera can read what the lens is and all of it's characteristics. Conversely you set the aperture value on the camera body, and the information is sent to the lens..

Best wishes.

Mike..

Comment #1

It makes sense that the lens would have a chip and I somewhat thought that it would in order to know these things..

Is that only for "digital" lenses or do older lenses from non digital SLRs have the some thing. (i.e. an EF lens from a film camera)..

Comment #2

Same deal for EF lenses in film cameras, plus, EF lenses from film cameras work on digital cameras..

Long ago, when you put a l;en onto a camera you needed to either connect a pin and level mechanism, or set the lens to a particlar mark onth aperture scale, after which the camera would "remember" the lens settings, until you put a different lens on..

BAK..

Comment #3

That put that question to rest. Thanks for the info...

Comment #4

The camera really doesn't know. It just meters the light coming through the lens and that is all it needs to know. I hope this helps..

Best regards,http://www.brucekersten.com..

Comment #5

Bruker wrote:.

The camera really doesn't know. It just meters the light comingthrough the lens and that is all it needs to know. I hope this helps..

The aperture can be adjusted, not by turning the ring on the lens, but by turning a dial on the camera body. So the camera needs to know the limits for the max. and min. available apertures.Regards,Peter..

Comment #6

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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