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As far as I know, the fastest lens (that is actually availabe) is currently the leica 50mm f/0.95 http://en.leica-camera.com/photography/m_system/lenses/5915.html …

I can see the argument for picking based on lenses, but that factor is negligible if you stay to larger brands (Canon, Nikon, and to some extent Pentax), as they all have an extensive lens selection. …

If you are looking for a higher quality lens that will provide a much sharper image and better color reproduction than the 18-55, then a very good option is the Canon EF-S 17-55 f/2.8 IS USM. …

Also, compare the lens construction: EF 70-200mm f/4L USM - 16 elements in 13 groups EF 70-200mm f/2.8L IS II USM - 23 elements in 19 groups (1 Fluorite and 5 UD elements) Notice the difference here … On top of the increased cost of production, the higher the quality of a lens, the more focused it will be on professionals. …

Usually a kit lens is f/3.5-5.6, while a good zoom is f/2.8. That difference is huge when working in low light. …

This is a little more complicated to explain, but imagine you have an option between an f/2.0 lens, or an f/8 lens. …

Also, I highly recommend getting a lens hood, which is very helpful in midday sun. … Overall it's a decent lens, and at such a low cost it is a great option if you don't have a lens with a similar focal length. …

My favorite is dpreview, which has a Lens Review Widget that is pretty cool. …

There are two key specifications of a lens that determine the depth of field, the focal length and the aperture. … (There are other factors such as distance from the subject and sensor size, but those are not directly tied to the lens). …

My main concern with this approach would be that the alcohol could clean the lens too well, removing some of the coatings that are added to reduce glare. … From the sounds of it, that risk isn't too much of a problem in your situation though, as I'd rather have a lens with the possibility of bad coatings than a lens that doesn't focus well. …

I think I would want a fairly wide angle lens, because even if you can't zoom farther, you can always crop. I would also want a weather-sealed lens, since the conditions are a bit crazy. … Weather sealed (as long as you use a UV Filter, which you'll probably want at altitude anyway) light weight (lightest L lens at 475g) Good price at amazon Also, if you were to take a second lens, I would …

It is possible you simply haven't found the correct audience, or it could be that your price is too high. I personally would be happy with a f/4 version because for what I tend to shoot, I don't nece …

If you want a shallow depth of field, you can increase the aperture width. The easiest way to do this is to switch to aperture priority mode (A on the dial) and set the largest available aperture (sma …

It isn't a lens review site per se, but lenshero.com is a great tool for comparing lens options. Like Snapsort for cameras, they've got a lens comparison tool. … The front page features a walk-through find-me-a-lens thing, which I find slick but not so useful if you've got some idea to start with. …

The abundance of adapters for old lens mounts should be a good indication of the long lifespan of a good lens. …