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Any telephoto zoom 4/3 Lenses for E-M1 that are much better than similar m4/3?

Started Mar 9, 2014 | Discussions thread
Anders W
Anders W Forum Pro • Posts: 22,144
Re: Where does the 70% number come from?

Anders W wrote:

DonSC wrote:

I was thinking this is what you were using. I just think it's very misleading.

In what way are the laws of physics misleading?

It's like saying that uprezzing an image by 50% degrades the quality by 50%.

It does in exactly the way expected. The resolution per millimeter declines by 50%.

I think this is more realistic: http://photographylife.com/image-degradation-with-nikon-teleconverters

As I said, the fact that the sensor resolution stays constant and image resolution is a function of both lens and sensor resolution may make the problem less significant.

Note however, that this is for the case where we are comparing a lens to itself, with and without TC. When we are comparing a lens with 1.4x TC with another lens without TC, the lens with TC has to be 1.4 times better in order to match the lens without.

Another thing that should be kept in mind when making these comparisons is that the TC will be using the best part of the image circle of the lens it is mounted to. For example, when you mount a 2x TC, it's a bit like when using an FF lens on MFT. You are just using the first half of the diameter of the image circle. This also helps make up for some of the loss due to the magnification.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus PEN-F Olympus E-M1 II Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +20 more
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