>>4343269>So with the 85, use roughly 40mm of extension tube?Nothing wrong with using less. You could use 12mm, 20mm, 24mm, doesn't matter. Just the greater the tube length the bigger the effect is has. The only thing the half/focal distance thing is concerned about is that's where you get some heavy deminishing returns / your working distance can become nil.
>1.6x teleconverterYou can, so long as it would work with the lens in the first place. The problem is you'll be reducing the light reaching the sensor even further. Not saying it can't work, but in macro photography you're already fighting for light.
>>4343271>Fair enough, i just use the built in [flash]Nothing wrong with this, the results might just make the lighting look a little harsh
>MFD What's that?Minimum Focusing Distance. Refers to the length from the sensor (in your camera body, not the lens) to your closest focusing point. Since it is measured from the sensor, you can end up in situations where the focusing point is closer to the sensor than your lens sticks out therefore you cannot focus a subject at that point. That's what happens when you have too many extension tubes and not enough focal length / starting MFD (i.e what's marked on your lens as the original MFD >pic rel).
I also highly recommend a tripod if the situation allows for and learning how to focus stack. Some cameras can do this in-camera and also handheld. OG way is to take the photos manually then stack them in post. The results are fantastic if done properly but takes extra steps / effort.
