For many years, prosumer DSLRs have been said to have "APS-C" size sensors. Or "1.6x crop factor", or "1.8x". That's a a multiplier for effective focal length, relative to using the same lens on a 35mm film body.

DSLRs with sensors the same size as 35mm film were called "full frame".

APS-C crop factor is around 1.5x - 1.6x. 1.8x is a bit too small for digital cameras and I never encountered one.

Canon uses 1.6x, and everyone else is on 1.5x bandwagon.

Micro Four Thirds is a 2x crop factor and I absolutely love my Panasonic GH-5. I primarily use it for 4k video which it excels at, as the smaller sensor means it can record 4k at high bitrate continuously without overheating. That said I still find it extremely rewarding for still photography. I'm happy with the results event when printed up 13"x19" on my Canon Pro-100 printer. Some photo samples I am proud of, limited to 4k resolution by twitter but 20 megapixels originally.

https://twitter.com/TLAlexander/status/1531837629938798592

Ah, sorry, I meant in APS-C world, sorry for the confusion.

I love m43 systems, but their low light capabilities leave something to be desired. I shoot tango nights sometimes, and anything smaller than a FF system can’t keep up with the lack of photons, unfortunately.

Other than that, they’re brilliant little systems.

There is some stuff I shoot:

https://www.flickr.com/photos/zerocoder/

FWIW, low-light performance has significantly improved in the last couple of m43 generations. My G9 (with a sufficiently wide-open prime) gets shots that my G7 and GH4 never had a chance for, and while the GH6 isn't great as a stills camera I expect to see even better for the photo-focused cameras using that sensor.

I understand, and certainly support improvement in every size and family.

However, when you're trying to shoot movement with 1/60, f/2 @ ISO10K, nothing smaller than FF cuts it. It's almost pitch dark and flash is strictly prohibited.

An F/1 25 mm m43 lens would capture the same photons as an F/2 50 mm full frame one. Certainly an F/1 level m43 lens is a lot harder to find, I'm only aware of fixed focal length manual focus unstabilized ones...

However, the noise floor on these m43 sensors are nowhere near the full frame counterparts, unfortunately. Getting same resolution requires much smaller pixels, too.

I love more compact systems, but we can’t bend physics, for now.

Oooh gotcha yeah the "a bit too small for digital cameras" line threw me off. But that is wonderful photography thanks for sharing!

Smaller sensor are the best teleconverters one can get, aren't they? Nice pictures, really something to aim for!

Thanks, I meant 1.6x and 1.5x. (Was a Canon person, and loved the reach of the 70-200/4L on 1.6x so much, that I never wanted to go to full-frame.)

They reused it because the sensor size is equal to that film cartridge’s frame size.

Same for full frame. That’s equal to 35mm film.

Ever dialed a phone number?

Uh, 20 years ago.