Sony E-Mount body to Nikon F-Mount Lens adapter

thingiverse

This one is based on Julian Toledo's lens adapter for using Nikon lenses on Sony NEX or A7, A7R and similar body cameras. The original can be found here: https://www.thingiverse.com/thing:719655 Main changes for my edit include: 1) Corrected both Nikon and Sony side bayonet clearances so neither lens nor body will get loose. Nikon lenses will hold on friction, while the adapter on the camera body will stay using both friction and body clamp. 2) Made minor changes to the model structure so it should print with only necessary supports at the top where "wings" for the Sony bayonet are. You can print with a 5-degree slope tolerance for the supports. Also, I removed sharp edges within the inner light diffuser so there will be no stringing during the printing process. 3) The main problem after printing this adapter is getting actual infinity focus using manual lenses. It's a pain and there is no perfect solution when you stick the lens' focus to infinity. Due to small imperfections in the printing process, even a 150-micron delta between bayonets or an uneven top surface won't get you a perfect infinity focus. I made a few editions of the adapter considering its thickness for getting infinity focus: 1) The distance between the top (excluding "wings" that go inside the Sony bayonet) must be exactly 28.5 mm, as it is in the original design. 2) A safe thickness is slightly smaller - about 28.3-28.4 mm. This way you can get a bit beyond infinity focus but you'll get it for sure. 3) When printing with ABS, it will shrink a bit after cooling, making the adapter's thickness a bit smaller. It's hard to say how much it will go, especially in the top-to-bottom axis. Now, how to decide what to print - note that these models are all the same except for being different in length: 1) F-E-Adapter_ABS This is one I printed with ABS without any additional scaling for printing purposes. It has a really slight overshoot beyond infinity focus but generally looks good... Don't ask me why, but it's 0.7 mm shorter than the original design and yes, the focus is almost perfect. 2) F-E-Adapter_Generic This is the Julian Toledo's original one with 28.5 tolerance with my changes considering things I've described above. It's just a bit "upgraded" version of the original one. 3) F-E-Adapter_Experimental I added 0.1 to the thickness of my ABS version. It looks it could fit perfectly in infinity focus using my printer, but I was lazy to actually print it. Again, please note that I couldn't make some serious testing since I have only one lens. If either of these will fit your lens, please leave a comment. Note that shrinkage won't really make a difference on the adapter's diameter - the author made enough space for the lens to fit anyway. Also, don't forget: if you print one with 0.2 or thicker layers, make it about 0.1 at the 28.2-28.6 height - otherwise it won't be precise enough. If you can't insert the lens in the adapter, just cut a bit of the inner lower edges of the adapter - it's just an "elephant's leg" effect making lower layers to bulge out a bit. This adapter was tested with Nikon E 28/F2.8 and Helios 81M 53/F2.0 (with broken focusing control) manual lenses. The Helios was a bit loose (it has slight differences in construction), but also fit well.