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[生態] Use of extension tubes with 600mm telephotos

Use of extension tubes with 600mm telephotos

Hello,

Here in New Zealand much of our wildlife displays what is called ecological naivety or a lack of fear of humans (and many introduced pest predators). This means many species of our forest birds can be approached quite closely without provoking a flight response. Great for photography!However, my Nikon 600mm f4 telephoto has a minimum focusing distance of approx 16 feet, and I am constantly having to move away from birds in the forest in order to get them into focus.
Would it be worth using a small extension tube to help shorten this minimum focusing distance? Or would it introduce other problems, for instance:
1. Would it cause problems with existing focus fine tuning settings for this lens on my D810. (It had originally front focused and needed a 15 point correction in-camera)
2. Degrade the image in some way due to the altered light path.
3. Drastically reduce the depth of field.
I would be interested in your thoughts as I have not heard of this being done with long telephotos.If its a bad idea, can you suggest an alternative workaround for this problem? I am due to travel out to one of our pest free offshore island "arks" where many of out rare birds are found next week and will do some extension tube experimentation.

Please help

I didn't find the right solution from the internet.

References:
https://www.naturescapes.net/for ... p?f=57&t=274042
Video production agency

Thank you

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