Thank you for your reply, @rmpsrpms. As the acknowledged master of coin photography here on CCF, I'm happy to get your thoughts. 
I've had no trouble finding options for the T6 if I'm willing to spend $500-700 for a new/old stock Canon macro lens - more than I paid for the camera and lens in 2016. I'm a little wary of buying a used lens and I don't know enough about the specifications to compare the offerings from other companies that may be more affordable. I've figured out that newer generation lenses won't fit my camera because they are produced at the tighter tolerences of the mirrorless cameras (or so I gather.) I've seen discussion on using an extender ring / macro "tube" / whatever it's called with the standard 18-55 lens that came with the camera and getting acceptable results.
My goal is to take full coin images that accurately represent the coin. If my existing lens is OK for that (and I gather it is from your comments,) I'd rather just stick with it. I'd like to shoot everything from dime to dollar.
I know very little about photography outside of the basics - and I don't have interest in becoming an expert. But I do want to use the equipment I have to capture good coin images. I've had fair success in the past. I moved to a new house several years ago and I haven't been able to get consistently good photos since I set up the system again. Just trying to start from scratch and exploring the best options.
I've had no trouble finding options for the T6 if I'm willing to spend $500-700 for a new/old stock Canon macro lens - more than I paid for the camera and lens in 2016. I'm a little wary of buying a used lens and I don't know enough about the specifications to compare the offerings from other companies that may be more affordable. I've figured out that newer generation lenses won't fit my camera because they are produced at the tighter tolerences of the mirrorless cameras (or so I gather.) I've seen discussion on using an extender ring / macro "tube" / whatever it's called with the standard 18-55 lens that came with the camera and getting acceptable results.
My goal is to take full coin images that accurately represent the coin. If my existing lens is OK for that (and I gather it is from your comments,) I'd rather just stick with it. I'd like to shoot everything from dime to dollar.
I know very little about photography outside of the basics - and I don't have interest in becoming an expert. But I do want to use the equipment I have to capture good coin images. I've had fair success in the past. I moved to a new house several years ago and I haven't been able to get consistently good photos since I set up the system again. Just trying to start from scratch and exploring the best options.
"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae























