HI, I've been reading the thread 'Just trying to get my head round aps-c and ff' in this forum with interset and note the view that buying full-frame lenses for APS-C cameras in preparation for a future move is not a good move. But what about the other way round?
I currently have a NIkon D7100 which I've been really pleased with. However, my son is developing an interest in photography so I thought I would let him have that and I would take the opportunity to upgrade. After looking around I had settled on a D750 or D800. The problem is that these are both full frame. We have a Nikon 18-300 and a Sigma 17-50 and it we hoped to share these and ocasionally hire other lenses. the Nikon site says "this is no problem and their FF cameras just auto detect the DX lens and it's fine'. Is it really that easy? I appreciate that until I can afford a full size lens I'd only be using the 'crop' portion of the sensor but other than that, is there a problem with taking this route?
If it's going to be a issue are there any sensible aps-c bodies that would be good upgrades for the D7100? Most of our time is spent taking pictures of cycling and motor sports if that helps guide an answer.
Thanks for any help or suggestions.
I currently have a NIkon D7100 which I've been really pleased with. However, my son is developing an interest in photography so I thought I would let him have that and I would take the opportunity to upgrade. After looking around I had settled on a D750 or D800. The problem is that these are both full frame. We have a Nikon 18-300 and a Sigma 17-50 and it we hoped to share these and ocasionally hire other lenses. the Nikon site says "this is no problem and their FF cameras just auto detect the DX lens and it's fine'. Is it really that easy? I appreciate that until I can afford a full size lens I'd only be using the 'crop' portion of the sensor but other than that, is there a problem with taking this route?
If it's going to be a issue are there any sensible aps-c bodies that would be good upgrades for the D7100? Most of our time is spent taking pictures of cycling and motor sports if that helps guide an answer.
Thanks for any help or suggestions.

Neither of our abilities warrants a big investment yet, so it's a case of making wise choices now and getting in a lot more practice.