Why not a 12-35 F1.8 - F2.8?

Started Apr 2, 2014 | Discussions thread
Klarno Veteran Member • Posts: 4,157
Re: How equivalency works.

superstar905 wrote:

Klarno wrote

Probably size and cost concerns. The f/2.0 FT zooms were generally criticized for their being the same size as, and more expensive than, FF f/2.8 glass; enough so that, looking at the systems separately, you'd actually save money and gain capability going for an FF system with a 24-70 and 70-200 over an FT system with a 14-35 and 35-100. While they may have been marvelous pieces of glass, they didn't by any means play to the system's strengths.

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You think its due to size concerns? How is the Sony 28-70 able to be so small then and priced well too?


The combo comparison size and price are almost the same, although its well known the quality of the Panny lens is superior to the Sony.

The bigger your sensor, the longer focal length you need to get the same angle of view. Conversely, the smaller your sensor, the shorter focal length you need, and the more retrofocus lens design you need to get the job done. It might just be easier to design a typical full frame lens just because it's been done so much longer and they simply don't have the same resolution and precision demands as smaller, newer formats.

Also the Panasonic achieves 24mm EFL at the wide end, which because of retrofocus design makes quite a difference size-wise. Heavily asymmetrical retrofocus design is less necessary on non-SLR cameras, but still remains necessary on any camera that has a fixed mount size. Both MFT and the Sony E-mount full frame system are using computational distortion correction, so they're in the same boat there.

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