Sigma 150-600mm Contemporary Lens Sharpness Test

Started 2 months ago | Discussions thread
Tord S Eriksson
Tord S Eriksson Forum Pro • Posts: 11,900
Re: Sigma 150-600mm Contemporary Lens Sharpness Test

byumpp wrote:

Tord S Eriksson wrote:

The male mallard (in eclipse) looks great! The dames have brick-colored beaks!

Other than that, as your a6000 has no IBIS, you need to use the classic formula: 1/ (focal-length x crop factor) to avoid shake being an issue, especially as you've turned the OS off.

So never over 1/1,000 sec, probably using a 1/2,000 to be on the safe side when testing the lens' sharpness.

With OS on, I'd guess 1/250 is 'safe', but don't bank on it.

A more modern camera might have helped, too, as they are getting better at getting the right focus.

Thanks Tord! I turned off the OS when camera was on a tripod (in this case on a ladder). I have read that when the camera is on a tripod, the OS should be turned off. The OS was turned off only on those brick wall shots and they were taken on AP mode with the ISO 100.

The OS/VR/OIS (whatever) is made to cancel human shakes, while most lenses on tripods usually have a nasty high-frequency vibration, which the anti-shake system simply isn't made to handle. Some lenses have intelligence built-in that can 'feel' when the vibration is non-human, and simply turns off when attached to a tripod head.

I think the Nikon 200-500 is such a lens.

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Owner of 1 Canon, 1 Olympus, 1 Pentax, 1 Ricoh, 1 Sony, and a lot of Nikon, cameras.

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