In general, only DSLR and mirrorless cameras are system cameras with many accessories as lenses and flashes.
Although being a compact camera, the Olympus TG-4 has a little system, with some accessories.
The camera:
The Olympus TG-4 is a waterproof camera that is resistant to sand, cold and accidental dropping. Beyond this, it has GPS and wifi built-in, a bright f/2 25-100mm FFE lens, 16 megapixel backlit CMOS sensor, aperture-priority shooting mode, RAW file support and 1080p Full HD movies. The Olympus TG-4 has some capacity of taking macro fotos. More information can be obtained at http://www.photographyblog.com/revie...us_tg_4_review and https://www.dpreview.com/reviews/oly...gh-tg-4-review.
The Olympus TG-4 was recently substituted by the TG-5, that can record 4K videos at 30fps or Full HD movies at up to 120fps for slow-motion playback. Please see http://www.photographyblog.com/revie...us_tg_5_review
The system:
The following accessories are available:
TCON-T01 Tele Converter - increases the optical zoom from 4x to 7x;
FCON-T01 Fisheye Converter - captures 19mm FFE ultra-wide panoramic shots;
CLA-T01 - Adapter and Lens Cap;
FD-1 - Flash diffuser;
LG-1 - LED Light Guide;
Float Strap
Tough System Case
My Olympus TG-4 is my companion when I'm riding a bike because it is very strong (almost dropping proof).
Cheers,
Antonio.