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F2.8 and light with Canon 17-55 and Sigma 18-35

Started Aug 18, 2015 | Discussions thread
Great Bustard Forum Pro • Posts: 45,641
Re: Keep in mind that 17-55 has 3- Stop IS, allowing slower shutter-speed for more light

007peter wrote:

Strange question but hard to answers:

  • If you have Sigma 18-35, then just shoot it at f/1.8. Isn't that the whole point of buying it in the 1st place? Why bother with f/2.8 is you own this lens????

I used anywhere from f/1.2 to f/16 with the 50 / 1.2L. Are you saying that's wrong?  That they should have all been at f/1.2?

  • While Canon 17-55/2.8 may be 1 1/3 stop slower to Sigma, it also makes up for it by having a 3 Stop Image Stabilization. allowing you to shoot at slower shutter-speed (1/10s ~ 1/40s) while retain sharpness.

For static scenes when you want a deeper DOF, or when you want motion blur, yes.

In my experience, image stabilization worth its weight in gold. It allow you to take sharp photo even at flow 1/10s ~ 1/30s and remove minor handshakes. While fast prime w/o IS will give me more shutter-speed, higher shutter-speed isn't always practical. For example, shooting at 1/60s~1/100s in lowlight often result in pitch-black-backdrop. Where as using slower 1/10S ~ 1/40s allow me to illuminate the backdrop and avoid the pitch-black backdrop that I find annoying.

When using flash, yes.

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GKN
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