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Tamron SP AF 70-300mm f/4.0-5.6 Di VC USD got 2 questions
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<blockquote data-quote="nickt" data-source="post: 744580" data-attributes="member: 4923"><p>Set menu A4 to OFF and it will stop re-focusing when you touch the shutter button.</p><p></p><p>Second question, No. Its a 300mm no matter what. Every thing is the same as full frame. The lens is 300mm. The distance to the sensor is the same. The sensor is smaller so some of the image misses the sensor. So the captured image is a 'crop'. That crop is then enlarged to a standard size when you view or print. So the 'zoom' is really just a crop and enlargement. Another way to look at it. Take a 35mm negative. make a 4x6 print. Then cut 1/4" off all sides of the negative. Make another 4x6 print from the trimmed negative. The print will look like it was taken with a 450mm because you had to enlarge the smaller negative. A full frame lens is just better glass. A crop sensor lens is made more cheaply. They know some of the image will fall off of the sensor so they design the lens more cheaply. Put that same 300mm crop sensor lens on a full frame camera (and tell the camera to ignore that fact so it doesn't automatically crop the image) and it will work the same as a full frame 300 but the edges will look like crap.</p></blockquote><p></p>
[QUOTE="nickt, post: 744580, member: 4923"] Set menu A4 to OFF and it will stop re-focusing when you touch the shutter button. Second question, No. Its a 300mm no matter what. Every thing is the same as full frame. The lens is 300mm. The distance to the sensor is the same. The sensor is smaller so some of the image misses the sensor. So the captured image is a 'crop'. That crop is then enlarged to a standard size when you view or print. So the 'zoom' is really just a crop and enlargement. Another way to look at it. Take a 35mm negative. make a 4x6 print. Then cut 1/4" off all sides of the negative. Make another 4x6 print from the trimmed negative. The print will look like it was taken with a 450mm because you had to enlarge the smaller negative. A full frame lens is just better glass. A crop sensor lens is made more cheaply. They know some of the image will fall off of the sensor so they design the lens more cheaply. Put that same 300mm crop sensor lens on a full frame camera (and tell the camera to ignore that fact so it doesn't automatically crop the image) and it will work the same as a full frame 300 but the edges will look like crap. [/QUOTE]
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Lenses
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Tamron SP AF 70-300mm f/4.0-5.6 Di VC USD got 2 questions
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