Take it to a camera shop.
SOURCE: 28-80 mm sigma won't auto focus
The lens may not be a dynex type so it wont work on your 700
SOURCE: Auto focus not working?
1st u reset the factory setting and then u see the lense is correctly fitted or not and the autofocus option is working or the manual focusing is there or not
SOURCE: My lens stopped working in
there is couple of possibilities like wise when you zoom lens manualy and can you heard the hard noise then could be AF unit itself faulty. AF unit gear is gone.
could be AF shaft broken thats why not focusing
could be AF Flex broken thats why not focusing
for that please bring to canon service center
SOURCE: error 99 and jerky fixation of focus between 17
'Error
99' indicates some problem with the AF contacts. This is a common error
in Canon lenses. It could indicate a very simple problem like dirty
contacts or a much serious one like the breakage of USM cable.
As a
first step, you can try cleaning the lens and body contacts (the metal
contacts between the lens and body) using a pencil eraser. Be careful to
hold the body facing down so that no dust falls inside. After cleaning
both the lens and the body contacts, re-attach the lens and try
shooting. If the AF does not work still, you need to take the lens to an
authorized service center.
For the jerky focusing ring, you need to get the lens serviced by an authorized service center.
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