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I would like to get into sports photography, and would probably want a better telephoto lens so I can get better close up shots. What other factors should I keep in mind as I make my choice? …

What is the point at which a lens is considered "ultra-wide angle" vs just wide angle? …

What equipment is necessary for real estate photography, and what is preferred? I'm starting into real estate photography, and I'm trying to figure out what I need and what I will want to plan on add …

These other names include: USM: Ultrasonic Motor (Canon) SWM: Silent Wave Motor (Nikon) SWD: Supersonic Wave Drive Motor (Olympus) SDM: Supersonic Drive Motor (Pentax) SSM: In-Lens Super-sonic Motor …

The only positive feelings I have about that lens is that it covers the 75-300 mm range. … I haven't actually used this lens, so I can't say for sure, but everything I read leads me to believe that the image quality is significantly better as well. …

As far as bumps/scratches, the most common ways to protect your lens are: UV/Protection Filters Lens hoods …

Reducing CA is done by modifying the lens design and/or materials so that different color wavelengths all have the same focal point. …

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

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. …

Besides the actual lens elements, there are also a lot of other components of a lens that are still being developed, on great example is IS/VR systems, which have become far more intelligent in recent …

I would like to get a little higher magnification out of my Canon 100mm Macro, so I am looking at extension tubes. I know Canon makes the EF25, but it seems pretty expensive considering there isn't e …

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. …

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. …

This can happen for a variety of reasons, so I'll just list a few common ones: too close to subject - lenses have a minimum focus distance, which should be listed on the lens low contrast - the AF system …

Any EF Lens will work on an EF-S (APS-C) mount without issues. … Regarding HSM support, I believe that is in reference to a Nikon mount version of the lens. Because the AF motors are in the lens for all Canon mount lenses specific body support is not needed. …