I paid less than $50 for mine, maybe more like $25. It is metal and has metal gears. Check Amazon. It is plenty sturdy for for the 100mm, and might be OK for the larger 180mm. If you want to move more than about 5” or you are making a decent amount of money from your macro shooting, then it might be worth it to spend a lot more money for something fancier.this lens has intrigued me forever and hope to see an RF version some day. However the amount of light needed/gear/technique makes it a difficult choice for me as sort of hobby. I ended up pivoting to the EF 180mm Macro and it's quite good, happy with results, but wish for even more magnification of course. Seems to work fine on R5, but would love to see an RF version some day too as it's also a very old lens model.
I've been tempted by macro rails.. any suggestions, nothing too high end as it's just a hobby.. but also been wanting to try on the 180mm.
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