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sweet spot

Alon Birshtain , Jul 21, 2005; 02:06 p.m.

What is it a "sweet spot"?

Responses


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Chris Hughes , Jul 21, 2005; 02:19 p.m.

Your question is far to general to answer. More detail please.

Alon Birshtain , Jul 21, 2005; 02:29 p.m.

I just read in one of the forums,and as I understood,that lenses has a "sweet spot",so I dont understand the meaning.

Gan Esh , Jul 21, 2005; 02:29 p.m.

Are u asking about the sweet spot for lens resolving power or aperture?

For lens resolving power: The sweet spot is usually the centre of the lens. All lenses get sharper as you move in from the edges towards the centre. On certain lenses, distortion occurs towards the edges as well.

For lens aperture: The sweet spot usually means 2-3 stops smaller than max aperture of lens. Some people say its between f8 - f11. In my opinion, this varies from lens to lens. Certain lenses are sharper and produce better better contrast at large apertures and exceptional lenses are just as sharp/contrasty at f1.4 as they are at f 5.6.

With zoom lenses, there is another type of sweet spot. This is for focal length. You usually get slightly better resolving power at middle focal lengths. Eg: on a 70-200 lens the sweet spot is usually between the 120mm - 160mm focal length.

Hope this helps. Clearer and more accurate explanations will definately be posted after this one.

Cheers!

Alon Birshtain , Jul 21, 2005; 02:31 p.m.

Thank you,Gan.

Mel Legget , Jul 21, 2005; 02:35 p.m.

!! In tennis, it is the part of the racquet that gets a great hit on the ball - - almost effortlessly! ~ For me, it equates on stage to a moment when the lights and the performance transcend. Can not answer for photography, however!

Alon Birshtain , Jul 21, 2005; 02:55 p.m.

Thank you,Mel.

SL ATTANAPOLA , Jul 21, 2005; 03:50 p.m.

Some of the newer racquets have an "enhanced" sweetspot too- Yippee!

David H. Hartman , Jul 21, 2005; 04:38 p.m.

The sweet spot for a lens is generally the best aperture for center and mid area image quality and excluding the deep corners. What’s involved is resolution, acutance and contrast which is usually referred to as sharpness. Most quality prime lenses achieve this at or just before f/5.6, zooms may require f/8.0. In critical testing you can sometimes see the bite at the center fall off some even as the edges get a little better. By f/8.0 diffraction generally start taking some bite out of the best lenses. F/11 is often a good compromise between DOF and diffraction.

Technically the sweet spot is were aberrations are well controlled and before diffraction starts kicking in. It’s a compromise between these.

Regards,

Dave Hartman.

Yaron Kidron , Jul 21, 2005; 04:52 p.m.

You know you hit the "sweet spot" when you start feeling guilty. Happens very often with people with NAS.


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