Some of you might consider buying Canon 135mm lens or telephoto zoom lens Canon 70-200mm. I’ve tried 135mm f/2 [Review], and Canon 70-200mm f/4 IS, and here is my opinions:
Canon EF 135mm f/2 is very sharp even wide open at f/2. It creates very smooth bokeh (out of focus area). Color and contrast is also awesome. The problem with this lens compared to 70-200mm zoom lenses is about versatility.
image is very sharp even wide open at f/2
Being a prime lens, you can’t zoom in or out. It is hard when you are working in tight space. Auto focus is fast, but auto focus tracking is very slow. Therefore, 135mm is unreliable for sport photography. It is also shorter and lighter than 70-200mm lenses so it is more inconspicuous for candids.
Canon EF 135mm is best when you use Canon full frame camera such as Canon 5D mark II rather than crop sensor camera such as Canon 7D or T2i, because in crop sensor, 135mm is equivalent to 200mm in full frame, as a result, it become too long for regular portrait. It is also harder to handle because you need at least 1/200 shutter speed to combat camera shake. In 70-200mm, you have image stabilization (IS) to combat the shake.
In conclusion, if you are looking for ultimate image quality in term of sharpness and bokeh, 135mm f/2 is the way to go. If you demand more versatility because you are working in tight space and need lens that can focus fast enough to track moving subject, then 70-200mm lens is more ideal.
There are many versions of 70-200mm lenses, such as 70-200mm f/2.8, f/4, f/2.8 IS and f/4 IS.
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