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Landscape Photography; Getting the right Focus
Topic Started: Apr 27 2009, 11:01 AM (1,395 Views)
Mysilentkaopei
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i think that guy missed the point that a DT lens has NO CROP. either that or he's already begun his fanboy brainwashing.
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lenrek
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--9-6-1-8-9-5-5-6--
Mysilentkaopei
Apr 28 2009, 10:32 AM
i think that guy missed the point that a DT lens has NO CROP. either that or he's already begun his fanboy brainwashing.
Well... Maybe... But I think, he wants to have a 50mm as 50mm in APS-C not 50mm but 75mm in APS-C.

I think, if I remember correctly, someone explained that FF is the reference point for camera equipment. So, whenever someone say 50mm or 85mm lens, that is reference to FF (even APS-C is reference to FF). As photographer, you need to understand this, and make whatever adjustment you deem fit. So, if someone make a lens that is 50mm but not reference to FF, then it is going to screw up many established practices, calculation, or convention. If I understand correctly, than, that is definitely a big "NO NO".

A typical example is the DOF calculation.
Edited by lenrek, Apr 28 2009, 12:41 PM.
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FrederickYKFoo
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Mysilentkaopei
Apr 27 2009, 11:36 PM
whoa i think this one really need outing liao... shall i?

bro frederick, you're free all saturday mornings right?
Sorry did not get back soon. Have not been well. How about next week ? Where you have in mind to go ?
It is okay to be slow, as long you never stop.
Start and teach Photography since 1982
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Mysilentkaopei
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hmmm, anywhere's fine with me, punggol end?
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Mysilentkaopei
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http://s11.zetaboards.com/Alphamount_Singapore/topic/7146694/1/

Bro frederick, need you to put stamp of approval haha!
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tankm
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Back to fundamental when prime lens are the norm ......

For prime lens, you will most likely find a DOF scale window with various aperture marking as below .....
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With reference to the above, at f22 with the inifnity set to the f22 marking, you have now set the lens focus at hyperfocal distance of around 30ft. At that setting anything from around 15ft to infinity is "considered" to be in focus.

If you now change the aperture to f16, to set the hyperfocal distance, just move the infinity marking to the f16 marking, the focus will be at around 40 feets (the hyperfocal distance for the lens at f16) and anything from around 20fts to infinity is considered to be in focus.

The above of course is with reference to a FF 35mm camera. Hope this help.

Hint hint to SONY for a new camera feature, as the camera knows the lens focal length, the aperture and the sensor size it can easily set focus of the lens to the hyperfocal distance to optimize the use of DOF.

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lenrek
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Just found a site that gave more detail description on how to read "Distance Scale". Thought would be helpful to others:

Hyperfocal Distance Guide
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