Alley in Pisa, Italy

by Lars Kotthoff

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4
votes
3answers
94 views

How do extension tubes affect focusing distance?

How do extension tubes affect focusing distance? More specifically, what I mean to ask is : why does the maximum focusing distance become shortened when an extension tube is attached? - Why does the ...
2
votes
1answer
228 views

Is it wrong to call the image plane the focal plane?

I'm from France and I would ask a question on a point that I don't understand, as it seems that so many people confuse (or may be I'm wrong). On the camera, there is a symbol (a theta or phi) which ...
5
votes
1answer
705 views

What is an “image plane indicator”?

There is a symbol, a circle with a horizontal line passing through it, on the right side of the top-plate LCD of my Pentax K-5: This symbol also appears on my Pentax K-r on the left side of the ...
18
votes
1answer
1k views

What does the theta symbol near the flash represent?

On my camera, between the mode dial and the flash, there is a white theta symbol. I've also seen it on review sites in pictures of other cameras, often in different locations but always near the ...