Why no long slow primes?

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Atsel
Atsel Regular Member • Posts: 217
Why no long slow primes?
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In a last couple years we've seen such designs as Canon 600 and 800mm, both slow and relatively compact.

Previously, to get acceptable photo with a long lens, you were to open an aperture as much as you could.

Today, with highly sensitive sensors and effective image stabilizers, it is no longer necessary in many conditions.

Does the longer focal length necessarily mean long length of lens' barrel?

Is it possible to make lenses such as 135/5.6 with compact dimensions? Length less than 7cm, weight about 200g.

I'm interested in Fuji most of all systems now, so I put this thread in Fujifilm X section.

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