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01-12-2009, 06:39 AM   #1
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Multiplication Factors with Teleconverter

So if I have a K100D with a 1.5x multiplication factor, add a 1.4x teleconverter on, and then put a 300mm lens onto the camera, what will my focal length be? Is it 1.5x1.4x300=630?

Thanks!

01-12-2009, 07:22 AM   #2
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QuoteOriginally posted by runjmb Quote
So if I have a K100D with a 1.5x multiplication factor, add a 1.4x teleconverter on, and then put a 300mm lens onto the camera, what will my focal length be? Is it 1.5x1.4x300=630?

Thanks!
Yes, your camera's viewfinder will show an image equivalent to what you'd see in the viewfinder of a full frame 35mm camera with a 630mm lens.


Dave
01-12-2009, 07:41 AM   #3
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QuoteOriginally posted by runjmb Quote
So if I have a K100D with a 1.5x multiplication factor, add a 1.4x teleconverter on, and then put a 300mm lens onto the camera, what will my focal length be? Is it 1.5x1.4x300=630?

Thanks!

Your focal length will be 420mm (300x1.4).
The size of the sensor has no effect on focal length.
01-12-2009, 07:42 AM   #4
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Your focal length will be 420 mm. 300 x 1.4

If you want to think in 35mm film camera terms, your field of view will "appear" to be the same as a 630mm lens.

Peter

01-12-2009, 09:26 AM   #5
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QuoteOriginally posted by pschlute Quote
Your focal length will be 420 mm. 300 x 1.4

If you want to think in 35mm film camera terms, your field of view will "appear" to be the same as a 630mm lens.

Peter
I advise against thinking in terms of a format that you aren't using, and concentrating on what you are using instead.
01-12-2009, 01:46 PM   #6
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QuoteOriginally posted by Wheatfield Quote
I advise against thinking in terms of a format that you aren't using, and concentrating on what you are using instead.
I agree completely.
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