I have several TCs over the years, and recently pulled this out of the bag to use with my gear at rugby tournaments. It worked with many lenses in the past, but for some reason (probably needs an update?), it errors out on my 100-400II.
It works with my other EF lenses however, so there is something between the TC and 100-400.
Selling this for $75 shipped and paypaled, and should be great for other lenses, like long primes or Sigma long lenses, but it won't work with the 100-400II (or my copy anyways). Priced accordingly at about 50% of new.
If you quickly find it doesn't work with your lens after buying it, I will accept a return. I kindly ask you try it upon receipt however just to validate and complete the sale.
