a Grand Peace Dollar with great details

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Yep. There are some EOS lenses ("EF-S") that will only work on the small-sensor cameras like the Rebel series; others will work on both crop and full-frame bodies. You're most likely using either the 100mm f/2.8 macro or the 100mm f/2.8L IS macro; both will work fine on any body. I've got several lenses that won't work on the 6D II body, but the only one I've really missed is the 10-20mm wide-angle.

But the movement toward "mirrorless" bodies is gaining steam. You can use the old lenses on those with an adapter, but lenses designed especially for the mirrorless R-series ("RF") tend to be smaller and lighter for a given focal length and aperture, and there are some lenses for the RF platform that would be prohibitively heavy and expensive, or downright impossible, on the EF platforms.

 

EF 100mm 1:2.8 USM is the macro lens

 

Same one I use. Try the mirror trick for alignment and stop it down to F/11. You'll probably also want to investigate "mirror lockup", and use either a remote release or time delay. Mirror lockup gets rid of vibration from the mirror flipping up, and the remote or time delay gets rid of vibration from pushing the shutter release button. For macro photography, unless you're using very short exposures with really bright lighting, getting rid of vibration is critical.

 

It is interesting that I tried tonight to use my pocket camera, the Cannon G(X and when I set it into AV mode, it would't even go above F/11. I finally tossed it into manual, getting fustrated with the auto setting and set the ISO to 200, which is a setting I am familiar with, but the best i could was to set it to an apt F3.5 and an shutter speed of 1/25, which gave me decent result as a focal length of 10.2mm.

 

that is the Cannon with the macrolens... BTW the site works again

 

I'll add my 2¢ to the photography end of this discussion.

You're in AP (Aperture Priority), but try going full Manual. You're at 1/80 for shutter speed, which is borderline "safe" for a 100mm lens handheld. If you aren't using a tripod, use one. A lot of the time, oof (out of focus) is actually camera shake. If your shutter speed number is smaller then your lens' focal length, a tripod should really be used. With a tripod, you can use any shutter speed, even hours long.

Lower your ISO speed. 6400 can introduce sensor noise. 100 ISO seems to be Canon's cleanest speed, but 200 is good too.

Use the 2 second (or even 10 second) shutter delay. What this does is allows the camera to stop micro-shaking from your finger pressing the release. Alternatively, use a remote control release.

I too have the Canon 100mm Macro, but I use a Mamiya 120mm Macro on my 50D. The 100mm is a full frame lens, for 35mm, whereas the Mamiya is made for 645 film, which is almost 3x larger in area. In a nutshell, image quality deteriorates the closer you get to the outer edges of a lens' image area, and sine the 645's edge is so much further away from the center, and the crop sensor on my 50D is asking for less then 35mm film does, I get edge-to-edge sharpness.

Manual focus is key. Use live view at 10x, and get that focus crisp. The dof (depth of field) at f/8 will be enough to cover a coin from highest device to lowest field.

By using Live View for focusing, it automatically takes care of the Mirror Lock-Up, unless you exit LV. But even still, use the time delay or a remote.

Are you using additional lighting, or only ambient? Get 2 cheap LED lamps from Walmart, and get them in close, and I mean within 2 inches or so to the coin. It will really open up your shots.

The Rebel is a fine camera, and upgrading is really unnecessary. Image quality is determined by the following (and in this order); 1) photographer's ability 2) lens quality 3) camera body

Just my opinion.

 

Yeah, your minimum useful aperture (highest useful F-number) depends on sensor size, and the GX sensor is even a bit smaller than the Rebel's. I'm not completely surprised that the GX limits you to F/11. Shooting at that aperture should give you a very deep focal zone.

 

Most likely too deep

 

This is the pocket camera https://www.bhphotovideo.com/c/product/1308388-REG/canon_1718c001_powershot_g9_x_mark.html - It is not a slouch and it is considerably better than a phone camera. Look at the fishing pictures: http://www.brooklyn-fishing.com/