400 F2.8 or 600 F4

Started 2 months ago | Discussions thread
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tonyoco Regular Member • Posts: 170
400 F2.8 or 600 F4

Bit of a mute point as I don’t thinK I can afford either for the foreseeable  future but I think the question is worth asking.

Given the choice what would people’s preference be between these 2 lenses.  My thinking is that if you get the 400mm and use it with a 1.4x converter you end up with 560 F4 just short of 600mm F4. Using 2x converter you get 800mm F8.

This setup looks a lot more flexible than getting the 600mm as you still have a very fast lens at 400mm.

Obviously you can also use the tele converters with the 600mm and the focal length easily beats the 400mm with the  lens  840mm F5.6 or 1200mm F8 for the 1.4 & 2.0 converters respectively.

I know a lot depends on what you are using the lens for but what do people think.

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