Im using a 500D and I'm just thinking i do a lot of Food Photography currently with a 17-85 IS USM i mean it has been good. but i want to use a go bit more of a Professional look and feel to my work. so I'm thinking of Investing in a new Lens. Please recommend something below about $1300. I'm given the options of 50 1.4 and a 100 F2.8 L. Pleaseeee Help
With a 500D?
Use the EF-S 60mm f/2.8 Macro USM (about $400). That was my FAVORITE lens for food on a crop-frame body. It's ability to resolve fine detail is just amazing and easily rivals the EF 100mm f/2.8L IS Macro USM that I use with my full-frame bodies (I owned both at the same time though I ultimately donated my EF-S 60mm to a relative when I got rid of my crop-frame body.) The focal length is also pretty nice, and of course as a macro lens if you want to show some really close detail you can do that too. The problem with a 100mm macro on a crop-frame body is that you'll have to set the camera back a bit farther than you might guess. Sometimes you'll be taking a photo of just part of the food, sometimes a plate, but sometimes you'll get a setting (napkins, silverware, glasses, wine, etc.) and for those the 100mm will be fairly restrictive. The 50mm wont have the ability to resolve fine detail like the 60mm... not even close. You wont need the f/1.4 focal length for food... (that's paper thin) and you don't need the ability to gather more light because you'll be on a tripod and the food isn't going anywhere.
While you're asking about lenses, I'm sort of "reading between the lines here". Your rationale on the lenses is that you're trying to get get "more of a professional look" to your work.
The lens is just one element of that. It's important to have at least one good lens and I think if I were to only use one, it would have to be that EF-S 60mm macro.
BUT... lighting is going to have a bigger impact than the lens. Look at a single great food photo and if it was professionally done, it probably has a lot more lighting and light modifiers than you might possibly guess... cards (white or black foam-core boards) to control the look of reflections in plates, glasses, silverware, etc., reflectors, mirrors, flags, spots, grids, diffusers, etc. are used EXTENSIVELY in food photography to control every little bit of it, make sure the highlights are exactly where you want them, make sure there's just enough "shine" on the food to make it look inviting, but not so much to make it look like it's out of control.
Food photographers often work with food "stylists" (think... "designer" or "interior decorator"... but for food.) These people know how to create a setting for the food and also know how to primp the food to look it's best.
My initial food photos were "technically" correct exposures and image composition... but they were boring. I don't think they did much to make the viewer say "I really want this food!"
Here are some examples.
THIS SHOT was taken with a 500D using the EF-S 60mm f/2.8 Macro USM lens. NOTE: This is one of my earliest food photos. This is an example of what happens when you understand the camera and exposure and have an adequate camera and a very good lens... but lack the lighting and the styling. This image could have been much better.
Shrimp Burger by
Tim Campbell1, on Flickr
Here's a shot taken a few years later after I learned a thing or two. NOTE: This is not the same camera or lens, but I spent more time fussing on styling and lighting and used a more creative DoF.
Bistro 222's Sauteed Lake Perch by
Tim Campbell1, on Flickr
BTW, this is the same restaurant, same plate (did you notice?) and tablecloth... but this 2nd shot looks COMPLETELY different and much more inviting.