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

Started 3 months ago | Questions thread
moficera Contributing Member • Posts: 672
Re: Sony 200-600: What is the minimal extension tube to prevent focal breathing?

SimpleUser wrote:

Tony Rogers wrote:

Adding a 10mm or 16mm extension tube does increase the magnification a bit. It won't let you get much closer but it does reduce the "breathing" effect a bit.

See this thread - https://www.fredmiranda.com/forum/topic/1708038/0#15648724 - I started on the same subject. It has some details you might find useful.

The Breathing subject - discussed and demonstrated:

https://www.youtube.com/watch?v=qDXsG9FhKCo

It still doesn't really answer how to combat the breathing with the 200-600, because rarely, I get the chance to photograph wildlife within the 10 meter distance, without being able to take advantage of the tele to its extreme.

I was curious how much focal length/magnifications changes when you focus closely with the 200-600 G. My results are: you loose minimal magnification, about 96 % at MFD compared to infinity.

My testing: picking some fairly bright stars at 600 mm and focus to infinity. Next focus at MFD and stop down the lens to still have an idea where the stars are. Align both images and measure the offset of the stars.

Infinity vs. MFD, center of the stars  at MFD roughly marked, at f/32 you don't see them that good

for comparison infinity vs 10 m mark (displayed distance), you can see some offset but not much

 moficera's gear list:moficera's gear list
Sony a7 III Sigma 35mm F1.4 DG HSM Art Sony FE 100-400mm F4.5-5.6 Venus Laowa 100mm F2.8 Macro Sony FE 200-600 F5.6-6.3 +13 more
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