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

Started 2 months ago | Questions thread
AlephNull Veteran Member • Posts: 3,137
Re: Sony 200-600: What is the minimal extension tube to prevent focal breathing?

RGBCMYK wrote:

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.

unfortunately because there is very little vetting of the information online a large percentage of what has tons of thumbs ups and likes is actually incorrect information or only partially correct. As an educator teaching photography I find this a major hurdle for anyone trying to learn online. The word "influencer" makes my stomach churn because it should have a "warning" stating that what you are about to watch could or could not be truthful.

Doesn’t the term “influencer” already scream that warning?

The ones with knowledge and expertise aren’t called “influencers” “experts” or “professionals”, those are the people to look for. And no, the Northrups don’t qualify.

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