Canon's release of 600/800mm f11 lenses PROVES you don't need Cannons!

Started 2 months ago | Discussions thread
rogerstpierre Veteran Member • Posts: 4,430
Re: No ...

jwilliams wrote:

cosmicnode wrote:

jwilliams wrote:

Messier Object wrote:

But at the edges of the shooting envelope - in dim lighting when high shutter speeds need to me maintained - these lenses will struggle


Struggle? No more so than the fastest 800mm equiv. m43 lens. Nothing in m43 at 400 is faster than f5.6 which is the same as f11 on FF. The 800 sucks up as much light as any m43 400 lens available. Also Canons DPAF is quite good.

But the shutter speeds are 2 f stops faster for the m4/3 lens.

No they are not. You bump up the ISO 2 stops which gives equal noise to m43 2 stops lower and the SS is the same. Simple as that.

Except that getting accurate AF @ f11 is challenging. AF systems struggle with anything slower than f5.6. Birding in the forest @f5.6 requires ISO 1600-6400 for a decent speed.  That pushes the FF sensor from 6400-256000. Not as simple as that.

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