Nikon - Focus Distance not consistent?

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dperez Regular Member • Posts: 373
Nikon - Focus Distance not consistent?

This isn't a camera problem, it's a curiosity...  I've noticed this with both my D500 and D850.

I have a subject that's "X" feet away.  Shoot it at 50mm.  Shoot it again from the same spot, same camera, same lens, but now at 200mm.  The focus distance in the metadata isn't the same.

For example, Nikon D500, Tamron 150-600 G2.  Shooting at f6.3 at a sign about 3 blocks away.  At 150mm it says focus distance is 74.99m.  Same shot at 600mm says focus distance is 281.84m.  I'm pretty sure I'm more than 245 feet from this sign, so I suspect the 900 feet is closer to accurate, but why the difference?

It's not something I agonize over, it's just one of those things that probably has a perfectly reasonable explanation that I don't know.

Nikon D500 Nikon D850 Panasonic Lumix DMC-G2
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