Started 8 months ago | Discussions thread
Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 17,740
Re: 600PF??

A 400mm lens to be f4 requires at least a 100mm front element.

A 600mm f5.6 requires at least 107mm.

There are significant manufacturing cost and weight issues to consider.

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Leonard Shepherd
In lots of ways good photography is much more about how equipment is used rather than the equipment being used.

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