Sony 200-600: What is the minimal extension tube to prevent focal breathing?

Started 3 months ago | Questions thread
Tristimulus Veteran Member • Posts: 8,577
Re: Sony 200-600: What is the minimal extension tube to prevent focal breathing?

moficera wrote:

SimpleUser wrote:

Sony 200-600: What is the minimal extension tube to prevent focal breathing?

Presented in one of Tony Northrup's clips was "focal" breathing of the 200-600, where instead of getting the 600mm for instance, when closing the distance to the subject, it might revert to ~ 324mm, because the focal mechanism needs the space to make the focus (or so I understood from the explanation).

OMG I just watched the part of the video and this is why you should not watch these videos. They seem to have no idea what they talk about. They prove nothing. Sure with extension tubes you get more magnification, but zooming out with extension tubes until the framing matches the frame with no extension tubes shows the focal length at close focus? Who said the extension tubes Tony used are needed to get true 600 mm at MFD. This is total FUD. Don't listen to them.

+1

Why should a lens perform better with extension tubes, which it was not designed for, and worse without? That does not make sense at all.

Use extension tubes to get closer focusing if that is the only option. Would also expect somewhat degraded image quality when using the lens outside what it is designed for.

What matter at close focus is reproduction scale, not focal lenght per se.

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