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Old Mar 8, 2006, 12:36 AM   #1
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I own a Minolta 5D. I purchased a Minolta 100-200mm f4.5 Zoom Lens and a Tamron 1.4x AF Teleconverter. What would the zoom range be with these combined?
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Old Mar 8, 2006, 7:02 AM   #2
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Simply do the math if you want to see how the angle of view would compare to the same lens on a 35mm camera.

100-200mm x 1.4x (for the TC) = 140-280mm focal range

If this is a "trick question" your focal range would then be 100-280mm (since you could use the lens with or without the TC. ;-)

To get the same angle of view you'd have with your 5D on a 35mm camera, you'd need a lens with a focal range of approximately 210-420mm after you multiply by 1.5x to allow for the smaller sensor in a DSLR (with the TC attached).

1.5 x 140mm = 210mm
1.5 x 280mm = 420mm

It's actually 1.52x, but you usually see it rounded to 1.5x


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Old Mar 8, 2006, 8:49 AM   #3
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Another way to look at it (to make it easier to do in your head) is 1.52*1.4=2.1, round off to just 2x. That means 200-400mm effective 35mm equivilent focal length.
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Old Mar 8, 2006, 9:22 AM   #4
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Thanks for the info...
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Old Mar 8, 2006, 10:37 AM   #5
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Just to make sure you're aware of it, with a 1.4x TC you'll lose a stop of light, and that can make it harder for a camera to focus, and will make your viewfinder a stop dimmer (half as bright).

That also means that you'll have slower shutter speeds for proper exposure (half as fast) if shooting at wide open apertures for any given lighting and ISO speed.

Also, you'll usually see some amount of degradation in image quality when using a TC (although a 1.4x isn't going to be as bad as a 2x).

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Old Mar 11, 2006, 8:49 PM   #6
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I just recieved my new Tamron 1.4x teleconverter and my new Minolta 100-200mm f4.5 zoom lens. Took my first few photos with My Minolta 5D and the 100-200 lens with the tamron teleconverter. These were taken without the use of a tripod. Also, the auto focus works perfectly throughout the zoom range with the teleconverter and camera kept a constant f4.5. Please give opinions of quality of photos.

Thanks....

URL for photos is below.

http://www.franksphotos.zoomshare.com/
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