I thought it would be good separate out this discussion from another thread. Here is a copy of the comment I posted on a question entered in a separate conversation called "Number of Micromounters" originally started by Henry Barwood:
The Olympus TG-4 has a feature called "microscope" function that uses automatic stacking. It's an easy to use built-in feature selectable on the mode wheel. The effective shooting range is 5.5mm-18.0mm which provides very nice photos with good depth of field for everyday use. It's not intended to replace a professional macro setup, but rather to offer an additional tool at an affordable price at this shooting range. My main purpose for using it is to get a quick, good quality macro photo for species identification aid. And it also has Wi-Fi for smart phone control and there is an accessory light ring that can be purchased for uniform lighting. A couple of recent photo examples are attached here. All are in the 7mm to 15mm fov range.
In the last photo is the circular white feature a reflection of the ring light? 
Yes, the white circular form seen in the black mineral is light from the LED light ring reflector accessory attachment. Very impressed great way for more people like me to to get into macro photography and catalog our specimens. The TG-4 is the ideal field camera. Waterproof, GPS, good battery life, and the "microscope" function was invaluable when I was sampling localities for research. Only bad thing is I had to buy a lens adapter to put a lens cap on. Some 30 dollars. @Phil good to hear it works well. Any chance you remember what lens cap adapter it was? Adapter CLA-T01. It comes with the cap. And a pro-tip: Take the battery out when you aren't using it or turn GPS off. The GPS stays on and can drain batteries over time. Useful in the field (gets GPS data recorded accurately as soon as you snap a photo) but something to keep in mind.
That said, I used it in the Arctic for 2 weeks with GPS on and had plenty of battery life left at the end of the trip. Thank you Phil! Yeah looking for my first actual camera without going expensive this looks like a good start! 
If the TG-4 is like the older TG3, it is shock-proof to a limited range - I believe it can withstand a drop from 2 meters. You can place the camera directly on a surface, using the light ring and microscope mode to take images (with or without stacking)
A great general purpose camera, perfect for field work - and reasonable price. 
Here's a side-by-side comparison, without much experience with the camera (I just got it), and without trying very hard (e.g., no tripod). It has shake compensation too, so even hand-holding it while it shoots 8 shots to make the stack wasn't much of a deal. This was without the LED light ring, too, just light from a nearby lamp.
For those who are into DIY, here is a modified microscope stand, purchased on eBay for $25. The modification is pretty simple. For those who wish a ready made stand, see swarfsystems.com.
Against my own convictions, I don't use a lens cap and carry the camera in my back pocket on field trips. The front window on the lens is advertised to be sapphire and after three years, I don't see any scratches on the lens. I did have a problem with some pictures coming out very blurred until I discovered the problem. Carrying the camera in my back pocket with the lens turned towards my body would cause the lens to fog up, so I now carry it lens away from the body. When I get home, I wash the camera, under the faucet, and gently dry it. So far, so good!
Gene
