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Old Jul 27, 2007, 9:47 AM   #1
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Is there some kind of standards ? I have seen lots of zooms to have to rotate only 90 degrees before getting blocked on both limits. Is it the case for most zooms, even powerful ones ?
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Old Jul 27, 2007, 11:59 AM   #2
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Interesting question, what do you mean by rotate?

The front lens element or the barrel? If the front lens element, upper end lenses do not rotate at all.If the barrel some zooms are push/pull and also have no rotation.

There are no standards, each lens manfacturer does what they want for each lens design.




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Old Jul 27, 2007, 2:48 PM   #3
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Hi Peter

I apologise if I am not clear enough, English is not my native language.

My question is : by how much does the photographer hand has to turn the zoom left or right to reach the maximum or minimum lens ? Is this 90 degrees ?
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Old Jul 27, 2007, 4:56 PM   #4
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Nothing is ever clear in photography :blah:

You got me interested so I went and eyeballed the rotation required on some lenses I had at hand.


Code:
Sigma 120-300 f/2.8 hsm - 85 deg
Canon 100-300 f/4-5.6 usm - 80 deg
Canon 75-300f/4-5.6 usm - 95 deg
Canon 35-80f/4-5.6 -75 deg
Tamron 28-75f/2.8 - 80 deg
Tamron 19-35f/3.5-4.5 - 65 deg
Magnicon 28-80f/3.8-4.8 - 120 deg, (vivitar)
Krion70-210 f/4.5-0 deg, push/pull about 2inch from full wide to full tele
Looks like it varies but most seem to beless than90 deg. info to know.
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Old Jul 27, 2007, 5:52 PM   #5
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This is interesting I never thought about it.


MY sigma 28-200mm which I just bought (my first autofocus lens)has 90 degrees from wide to tele but what really gets me is it only has about 40 degrees from min to max focusing distance the struck me as odd.
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Old Jul 28, 2007, 10:06 AM   #6
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Thank you so much guys. I have access to only a limited number of zooms so that is great info for my camera rig as it is much easier to setupa remote zoom.

I guess it is fairly logical to have roughly 90 degrees, as this is the optimal natural motion of an adult hand.

Try to simulate a 180 degrees rotation of the zoom with your left hand, this is not so easy Getting older, it is even more difficult. :?
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