Is image stabilizer necessary? I'm thinking of getting the tamron or sigma 70-300 lens?

i dont know if ur cam has inbuilt is, in case it has it would not be much of a problem. Using is in both cam and lens will oly make the image more blurred, is is not of much use when using a tripod... And never go oly by net revies cos many a time in long run it will not be the same. They usually review it for a day and leave. So ty to get in touch with sum1 who has used the lens u mentioned