600 F5.6 DO

Started 2 months ago | Discussions thread
quiquae Senior Member • Posts: 1,905
Re: 600 F5.6 DO

Steve Balcombe wrote:

quiquae wrote:

Assuming that a) the mass of any given lens element is going to be roughly proportional to its area, and b) the mass of the entire lens is proportional to the mass of the front element, we would expect such a lens to be on the order of 1.56x as heavy as that Nikon @ 1460g, which means 2277g (5.0 lb). That's light, but not quite as light as you may have hoped.

I think you're probably being unduly pessimistic. The Tamron 150-600 zooms weigh around 2 kg, and they are only 1/3 stop slower. Remove all the zoom lens complexity, then use a DO element and the same light weight design and construction as the 600/4L IS III, and you will surely be around 1700-1800 g max.

Being "only" 1/3 stop slower results in 21% less surface area. There is a good reason why Canon is aggressively slowing down consumer grade RF lenses--huge wins in cost and handling in proportion to the loss of light.

As another reference point, EF 400mm F4 DO IS II is 2100g. According to my mass ~ front element surface area hypothesis, a 600mm F5.6 would be 15% heavier than 400mm F4, or 2415g (5.3 lb). So we're still in the general neighborhood of my previous guess, and nowhere near 1700-1800g.

Mind you, I wish I am wrong and you are right--I don't like heavy lenses. But I am not optimistic.

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