Canon has a neat 24mm EF-S pancake for their mirror-using d-slr line...and the lens is quite affordable. And Canon has a neat 45mm f/2.8 pancake also. Again, for mirror-using cameras. there is NO issue making small, short focal length lenses smaller and lighter by using a mirrorless camera design. But...longer focal length lenses can NOT be "miniaturized" any more than they already have been using modern optical design methods and modern high refractive index glass. A 300mm f/2.8 lens for Olympus mirrorless and a 300mm f/2.8 lens for a Nikon APS-C is basically the same weight and size and length. Only thing is, the Nikon has a bigger, better sensor, better low-light performance, better High-ISO perrformance, AND the option to be used on an APS-C body AND ALSO to be used on an
ever-better-performing, full-frame sensor body...depending on the need of the shooter or the sport or event or shooting scenario. Buy a miror-using Nikon camera, and you can use your lenses on APS-C bodies and/or full-frame bodies. ALL Nikon FX Cameras can mount and use Nikkor lenses...Nikkor lenses work on APS-C cameras and on FX cameras: lenses with dual-format capability. Mirrorless is mostly a one-format, tony-sensor game for the most part, with the exception of Leica and Sony.
Speaking of HUGE lenses....look at the sheer HUGE size and weigtht of the new Leica SL pro-cam's lens set for mirrorless--big, herking lenses....huh...whaddaya' know....the
smaller,lighter nonsense has once again, proven to be a cannard. (Cannard = a lie; a falsehood; a falsehood promoted as a truth.)
Leica-SL_Lens_Comparison-768x588.jpg
LOOK at the HUGE size of the Leica 24-90mm and the Leica SL's 90-280mm lenses. Fricking MASSIVE! Mirrorless lenses are smaller and lighter? Ummmm. NO.
Leica SL (Typ 601) Review: A Professional Mirrorless Camera | Red Dot Forum
Witness the sheer size and weight of Sony's 70-200mm f/2.8 lens for mirrorless--it's FRICKING HUGE. And heavy. And expensive. Same with 100-400 lenses for mirrorless...NOT small, NOT light, NOT inexpensive...$1,699 for the new Fuji 100-400.
It is easy to quote a few lines of text in a casual, offhand manner, but when you actually look at the totality of the lens offerings for mirrorless cameras, what happens is that the longer-length telephotos, and the 24-70mm f/2.8 lenses, and the 85mm high speed lenses are just as large, just as heavy, just as expensive, as the Canon and Nikon mirror-using d-slr systems' counterpart lenses.
Science. The idea that mirrorless lenses are ALL smaller and lighter than equivalent mirror-using d-slr lenses is total B.S. Look at Braineack's comparison above...the Sony 24-70mm is larger and heavier than the 24-70 Tamron VC lens...
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