Use of Canon extension tubes on EF lenses on Canon R5 body
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Use of Canon extension tubes on EF lenses on Canon R5 body
I purchased a Canon EF 100-400 4.5-5.6 L IS USM lens to use on my Canon 7D body for my trip to Masai Mara 10 years ago. I also purchased Canon Extension Tube EF 25 II and Canon Extender EF 2x III. I could never use these extender during that trip because the lens could not focus. After 15 years and with the new mirrorless technology I bought the Canon R5 Body recently. I use this lens on the new body and I am quite happy. Unfortunately I am unable to use the extension tubes even now. Please let me know where I am going wrong. Incidentally, I have signed up for your all-in-one package and I have picked up some good tips for bird photography.
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