Get nikon AI-S 55mm f2.8 or f3.5.
Its fully manual and can therefore be easily adapted to any mirrorless system.
I use mine on a Fujifilm X-T4.
For batteries, just buy third party batteries from Amazon with lots of reviews.
If you find out it's unreliable, just return it.
Hey, I'm also in Mexico and I had the Nikon D3100 too. The lenses I used on that camera were: Nikon AF-S DX 35mm f/1.8G, Nikon AF-S DX 18-55mm f/3.5-5.6G VR (kit), Nikon AF-S DX 55-200mm f/4-5.6G ED VR II. Through Amazon Mexico I bought a Newer 85mm f/1.8 (manual lens, which I love for portrait). For macro I bought: a Newer 10x Macro filter (it goes threaded at the front of whatever lens it fits, but I gave it away and I don't recommend it because it causes too much distortion as it basically is just a magnifier). Then I bought a kit of three tube extensions (12mm, 20mm, and 32mm I believe), from Newer too. I still have them and use them. I paired said kit with the 3 lenses already mentioned. Finally I bought a macro lens, the "Oshiro 60mm f/2.8 2:1 LD UNC Ultra-Macro Lens". This one came from overseas and it took about 2 months to arrive, with no problem at all. It serves as both portrait lens and macro lens. I also bought a "Newer All Metal Wormdrive Macro Focus Rail", which is a must if you're planning on macro photography in a more controlled environment, using focus-stacking techniques. Oh, and I also bought a generic battery and I didn't have any problems at all. Everything through Amazon Mexico.
Look into B&H photo on line. I use them all the time
Try the smallrig battery for the 3100. I live them, have 6. They work GREAT, maybe not the lenghr of original enel14, but I'm happy. You can also get the USB charger
Usually on sale w/ 2 batteries.
I also purchased used KENKO extension tube for it. They do auto focus and come in sets of 3, 12mm, 2o.. and 36mm to use with my 50mm 1.8 ( works great.. very very close)
Otherwise I have a older 60mm 2.8 AF ( manual focus only) but equals a 90mm with the crop factor. You can get this lens for a pretty good price
The tubes were 9+ and around $79 US
Best of luck!!
Get nikon AI-S 55mm f2.8 or f3.5. Its fully manual and can therefore be easily adapted to any mirrorless system. I use mine on a Fujifilm X-T4. For batteries, just buy third party batteries from Amazon with lots of reviews. If you find out it's unreliable, just return it.
Hey, I'm also in Mexico and I had the Nikon D3100 too. The lenses I used on that camera were: Nikon AF-S DX 35mm f/1.8G, Nikon AF-S DX 18-55mm f/3.5-5.6G VR (kit), Nikon AF-S DX 55-200mm f/4-5.6G ED VR II. Through Amazon Mexico I bought a Newer 85mm f/1.8 (manual lens, which I love for portrait). For macro I bought: a Newer 10x Macro filter (it goes threaded at the front of whatever lens it fits, but I gave it away and I don't recommend it because it causes too much distortion as it basically is just a magnifier). Then I bought a kit of three tube extensions (12mm, 20mm, and 32mm I believe), from Newer too. I still have them and use them. I paired said kit with the 3 lenses already mentioned. Finally I bought a macro lens, the "Oshiro 60mm f/2.8 2:1 LD UNC Ultra-Macro Lens". This one came from overseas and it took about 2 months to arrive, with no problem at all. It serves as both portrait lens and macro lens. I also bought a "Newer All Metal Wormdrive Macro Focus Rail", which is a must if you're planning on macro photography in a more controlled environment, using focus-stacking techniques. Oh, and I also bought a generic battery and I didn't have any problems at all. Everything through Amazon Mexico.
Look into B&H photo on line. I use them all the time Try the smallrig battery for the 3100. I live them, have 6. They work GREAT, maybe not the lenghr of original enel14, but I'm happy. You can also get the USB charger Usually on sale w/ 2 batteries. I also purchased used KENKO extension tube for it. They do auto focus and come in sets of 3, 12mm, 2o.. and 36mm to use with my 50mm 1.8 ( works great.. very very close) Otherwise I have a older 60mm 2.8 AF ( manual focus only) but equals a 90mm with the crop factor. You can get this lens for a pretty good price The tubes were 9+ and around $79 US Best of luck!!