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- Toby
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I think the ability to crop saves the faff of swapping from no TC to a TC and back again etc. The Z 600mm f6.3 with 1.4x TC is not going to let enough light in a lot of the time in the UK200-600mm is a fantastic lens. But suffers from a fair bit of focus breathing, so at closer distances it's said to be closer to 525mm.
If the 300GM is less prone to this you are also getting a bit of extra reach at closer focus distances which is nice.
This is the kind of lens I really wanted from Sony. But in some ways I prefer the Nikon's 400mm f4.5 because with 2x it can stretch to 800mm f9 but friend who owns it with Z8 tells me it's just better to crop than use 2x TC in most cases.
The other option is Z600mm f6.3 + 1.4x TC. But the issue there is I wouldn't have anything shorter. I'd like to have access to 400mm focal length at a minimum and I don't really want to buy another lens like 100-400mm.