X2 Convertor help
Jul 23, 2014 11:42:08 #
Hi having purchased a 120-300 sigma/2.8 os (not the sports version) I thought I would try a x2 convertor on the lens . I have had a set of cheep Jessops extension tubes and convertor for years in the cupboard ,never ever used or bothered with them! Model MC c/af1 x2 . What is puzzling me it appears I have not lost 2 stops of light as lens is still able to select f/2.8 or when you use tele-convertors does the camera body usually say f/2.8 but really is f/5,6 Is it possible someone as nobbled a circuit contact peg before I acquired them as given to me by a friend from Blackpool? Thanxs in advance Dave
Jul 23, 2014 11:54:18 #
It is possible that for some electronic reason, the converter is not communicating properly with the camera body. I would recommend using a Sigma converter or Tamron SP. I would also recommend using that lens with a camera body with micro focus adjust and adjusting properly !
Jul 23, 2014 12:03:31 #
C.R.
Loc: United States of Confusion
i use nikon converters, and to tell the truth i don't pay any attention to what is being reported, i take test shots, view them and go from there
Jul 23, 2014 12:07:09 #
imagemeister wrote:
It is possible that for some electronic reason, the converter is not communicating properly with the camera body. I would recommend using a Sigma converter or Tamron SP. I would also recommend using that lens with a camera body with micro focus adjust and adjusting properly !
Also, with the 2X, you will need good lens support and sharpness technique .....
Jul 23, 2014 17:18:15 #
imagemeister wrote:
It is possible that for some electronic reason, the converter is not communicating properly with the camera body. I would recommend using a Sigma converter or Tamron SP. I would also recommend using that lens with a camera body with micro focus adjust and adjusting properly !
Thanks imagemeister, yep shoot with 7d and 5d which has micro adjustments . Never had to use that function before ? Do I need to purchase a spider graph? cheers Dave
Jul 23, 2014 17:19:40 #
C.R. wrote:
i use nikon converters, and to tell the truth i don't pay any attention to what is being reported, i take test shots, view them and go from there
Cheers for that C .R.
Jul 23, 2014 18:35:39 #
big d wrote:
Thanks imagemeister, yep shoot with 7d and 5d which has micro adjustments . Never had to use that function before ? Do I need to purchase a spider graph? cheers Dave
I would not buy anything - go to - "learn.usa.com.canon" - or google "canon micro focus adjust" for a tutorial ....
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