I spent a whole summer trying to track down the perfect macro for my D7500 without blowing my entire savings. I actually started with an older manual lens but quickly realized that for handheld bug shots, I needed stabilization or I was just gonna end up with a bunch of blurry bee butts. I eventually snagged a used Tamron SP 90mm f/2.8 Di Macro 1:1 VC USD (F017) for about $400 and it was a game changer for my hiking kit. Heres my take on the options after dragging them through the woods for a few seasons:

• The Tamron version (specifically the F017 model) has stabilization that feels way stickier than the Nikons. When youre leaning over a flower trying not to breathe, that extra bit of VC really counts to keep the frame steady.
• If you go with the Nikon AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED, youre getting a lens thatll probably survive a nuclear blast. Its built like a tank but its definitely heavier, which kind of sucks on long uphill hikes.
• The real dark horse is the Sigma 105mm f/2.8 EX DG OS HSM Macro. Its usually the cheapest of the three on the used market, often sitting right around $350, and the sharpness is basically identical to the others even if the AF is a tiny bit slower. Personally, I think that Tamron is the sweet spot for your budget. I found the colors to be slightly warmer which looks great for nature stuff. Just make sure you get that specific F017 model with the silver ring at the base, not the older versions which had slower focus.

Building on the earlier suggestion, I totally agree the Tamron is sharp, but be cautious about the weight if you're hiking. Those full-frame lenses get heavy after a few miles. Since you're on a D7500, you might want to look at a DX-specific lens to save some cash and your back.

• Nikon AF-S Micro-NIKKOR 85mm f/3.5G ED VR is the real dark horse here. Its way lighter than the 105mm and the VR is actually really solid for handheld shots. You can usually find them used for under $300.
• Make sure to check the autofocus limiter switch on used gear. If it feels loose or wont click right, it's gonna be a pain in the field.
• If you can live without stabilization, the Tokina AT-X 100mm f/2.8 AF Pro D Macro is incredibly sharp for the money, but handheld work is definitely gonna be a challenge. I'd suggest the 85mm for hiking tho. It's just a more practical balance of weight and performance for a long day on the trails.

TIL! Thanks for sharing

I have been following this thread for a few hours and honestly the whole process of finding a decent macro lens without getting ripped off is just exhausting! It drives me crazy how much prices have skyrocketed for older glass lately. I spent weeks researching for my own kit because I am absolutely terrified of buying a lens that ends up being a paperweight due to compatibility issues. It feels like such a scam that we have to pay a premium just for the peace of mind that a lens will actually talk to the camera properly! Nikon basically treats DSLR users like we dont exist anymore now that they have shifted everything to mirrorless. It is honestly ridiculous. I love photography so much but trying to be a responsible, cautious buyer in this market is a total nightmare. The quality control feels like it is slipping across all the major brands and it makes me so anxious! We just want gear that works without breaking the bank. TL;DR: The used market is a total headache and the way big brands abandon their legacy users while hiking prices is absolutely frustrating.

Regarding what #1 said about I spent a whole summer trying to track... I actually have to disagree about the Nikon being the superior choice here! On a D7500 body, the Tamron SP 90mm f/2.8 Di Macro 1:1 VC USD F017 is technically more advanced for handheld shots. The VC (Vibration Compensation) in this specific F017 model is absolutely incredible and handles the high-frequency micro-shakes much better than the aging Nikon VR system. Its a fantastic piece of engineering with an ultrasonic silent drive thats lightning fast! Quick technical tips for your trip:

• Always use the focus limiter switch to keep the AF from hunting.
• Stop down to at least f/8 or f/11 because your depth of field is gonna be razor thin at 1:1 magnification. Love the internal focusing on this one too since the lens doesnt physically extend. Truly amazing sharpness for the price! Its basically the gold standard for third-party macro glass right now.

I've had a moment to think about this more and honestly, you might want to consider some alternative setups if you're trying to keep the budget tight. Macro glass can be a bit of a money pit, and I'd suggest being cautious about buying a heavy lens for hiking without trying some cheaper methods first. You can get some incredible results with a bit of DIY spirit.

• Look into getting a Nikon BR-2A Reversing Ring. It's a very inexpensive way to turn a 50mm or kit lens into a high-magnification macro tool, though it takes some practice to master.
• The Nikon AF-S DX Micro-NIKKOR 40mm f/2.8G is a solid dark horse. It's lightweight and super sharp, but make sure to account for the short working distance so you dont spook the bugs.
• Consider picking up a used Kenko Auto Extension Tube Set DG for Nikon F-Mount to see if you even like the macro workflow before committing to a dedicated prime. I'd also recommend checking out the macro tutorials on the Cambridge in Colour website. They have some great technical breakdowns on magnification ratios that helped me out a ton when I was starting. Just be careful with the weight in your pack... those 105mm lenses feel a lot heavier after the fifth mile tbh.