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Forum: General Photography
06-16-2015, 03:17 PM
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It depends upon what you want, I suppose. f3.5 lenses were made in almost every focal length for years to save on cost and weight over faster lenses. If you were shooting landscapes, where you may likely be hiking into an area and would be using a tripod anyway, f3.5 wasn't that big of a deal.
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Forum: General Photography
06-02-2015, 05:00 AM
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I think it's mostly a manufacturing decision. What's the use of having an extra stop if it's not usable? To achieve that, a lens has to be more highly corrected. Generally, faster lenses will be bigger (to allow for the wider f-stop), heavier (due to the number of corrective elements), and far more expensive (because they needed more research & development and will sell in fewer numbers than a less expensive alternative.).
FYI, when talking about apertures, most photographers refer to the physical size of the aperture. The "smaller" apertures are not the ones with smaller numbers. Those are the widest ones. The physically smaller apertures have the bigger numbers...f16, f22, etc... :)
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