I have a Sigma 400 mm FD lens which comes with an FD to EOS (EF) adapter. Is it possible for me to attach an extender to it. May be a 2X FD extender and then attach the FD to EOS (EF) adapter.
Is it possible? If so, how do I go about doing it?
I Googled online for an answer and also asked some people at the local camera store if they had any idea. I came to know that Canon has two 2x FD extenders FD 2X-A and FD 2X-B. Apparently FD 2X-A are for lenses 300mm or higher and FD 2X-B are for lenses below 300mm.
So, I took a risk and bought a FD 2X-A extender from eBay and I was able to attach the extender to my Sigma 400mm lens. I then attached the FD to EOS converter to the extender.
I focused the combination on the moon to see if I could get infinity focus and I was happy when I was able to focus further from the moon.
think yes but you will have several disadvantage that are mainly:
generally a worst quality of image compare to actual lens (especialy L serie of this focal)