I am looking to buy a new lens and want something that will produce sharp images of people from a distance. I currently have a 50mm prime lens and my close-up portraits are great - crisp and clear - exactly how I want them. However, when I step back to get a photo of a person from a distance so I can include a lot of the scenery, they aren't as sharp and clear as I would like. What kind of lens would be best for this? Or is there something different I should try? The first photo is a portrait that is sharp enough to my liking. The second one was from a great distance and it is not very sharp at all - this is what I want to fix. I want my subjects to be just as sharp when having (or wanting) to pull back from them a great deal (either to incorporate a lot of people or to incorporate more scenery)
There could be any number of factors coming into play here. Lack of sharpness is many times due to how you captured the image and not what lens you are using. It is not impossible for the lens to be at fault, but if you have a 50mm prime lens already - I would be willing to bet you can achieve very sharp images with it if it is used properly.
Some of the possible culprits include:
- Capturing your subject at the edges of the frame(such as in the second image) vs the center(such as in the first image)
- Selecting too wide of an aperture for the number of subjects(and their varying distances from the camera)
- Using the widest aperture that your lens is capable of (i.e f/1.4 with a 50mm f/1.4 lens is going to produce the least sharp results typically compared to f/5.6 or so)
- Poor autofocus technique, such as the "focus and recompose" technique with the center AF point only.
- Selecting an aperture beyond the diffraction limit such as f/16 on most modern DSLRs.
- Too slow of shutter speed to remove handshake
- One of your lenses may need microadjustment to accurately focus.
Without more information such as the aperture, camera, lens, and full size images - I can't be more precise. But those are some of the things to look into and consider at a high level.
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I prefer telephoto lens with 2.8 aperture. For Canon, I'v found that their 70-200L f2.8 works well for me. With a telephoto you can get the narrow depth of field and maximize it with the 2.8 aperture open. That'll give you the best quality for a portrait. The 70-200L is also very sharp.
P.S. You can get a narrow DOF with a telephoto end, but only if you get as close as possible to the subject.