topic I have a CanonEF 70-300 lens. I just ordered a Canon 5d Mark III. Will this lens work in EF & RF Lenses https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74180#M16892 Will my EF 70-300 work with my new 5d Mark III when it arrives? Wed, 12 Mar 2014 00:17:51 GMT Ycampguy 2014-03-12T00:17:51Z I have a CanonEF 70-300 lens. I just ordered a Canon 5d Mark III. Will this lens work https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74180#M16892 Will my EF 70-300 work with my new 5d Mark III when it arrives? Wed, 12 Mar 2014 00:17:51 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74180#M16892 Ycampguy 2014-03-12T00:17:51Z Re: I have a CanonEF 70-300 lens. I just ordered a Canon 5d Mark III. Will this lens work https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74184#M16893 <P>yes</P><P>&nbsp;</P> Wed, 12 Mar 2014 01:52:54 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74184#M16893 Boogieman0 2014-03-12T01:52:54Z Re: I have a CanonEF 70-300 lens. I just ordered a Canon 5d Mark III. Will this lens work https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74190#M16894 Ha. Yes.<BR />A full frame camera like 5d3 uses all EF lenses, but you cannot use EF- S lenses. Wed, 12 Mar 2014 03:05:53 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/I-have-a-CanonEF-70-300-lens-I-just-ordered-a-Canon-5d-Mark-III/m-p/74190#M16894 ScottyP 2014-03-12T03:05:53Z