Instruction: Assess the user's sentiment in the provided review and select the appropriate sentiment option from the list as the answer.

Input:
I now have bought two lenses that were not designed for the smaller digital camera sensor, and both consistently fail to autofocus, the Sigma 28mm and the Canon 50mm f1.8 II, both relatively inexpensive lenses, and both designed for film cameras I believe. I was able to get both to focus most of the time by using my "live view" focusing, but it is slow and you can't use the viewfinder. I just couldn't justify keeping this large, heavy, no doubt very high quality lens if it was going to be that difficult to use.
The kit lens that came with my Canon XSi focuses much more reliably, maybe because that lens is designed for small sensor cameras.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: D: negative