Originally posted by Fogel70 I use all type of lenses (focal length), but if I can find a camera that give me an advantage over another I like that.
I don't believe there is one type of camera that are best on everything. I like DSLR because it gives me a through the lens optical viewfinder, but that design has some disadvantages when it comes to lens design.
Had there been an affordable digital RF system I would have got that, but now mirrorless systems can offer the same advantages as RF.
Retractable lenses will only look smaller once mounted on the camera, but not in the bag.
And the rear lens element has to be small on this type on lens so you can't put the rear element very close to the sensor, and the limited space for lens elements inside the mirror box will limit it to very slow lenses.
I could maybe work on a slow kit zoom, but but to design lenses that can't be mounted on all K-mount cameras seems like a strange idea, and totally against the point of using an existing mount.
This Samyang 16mm f/2
This is Samsung 16mm f/2.4:
None have big rear element. That would fit very easily inside the camera. As of the final size basically that's the Samsung with a bit longer part of the lens narrow behind the mount, a bit less bigger after the mount. if you do it fully, for 45mm to 25mm you have to shift things by 2cm but then if you could manage that the lens would be exactly the same size.
As the Samsung mount is a bit narrower and put lot of contacts in the inner diameter, this mean that basically any NX mount lens HAVE TO have a narrow rear element that would easily fit inside a K mount hole.
As we can agree that some lenses may be too big to move the rear of the lens by as much as 2cm to get exactly the registration distance of Samsung NX, we may move only by say 1.5cm and adapt a bit the design and as the result the lens may end up a bit bigger, but not that much and remain many time smaller than the classical DSLR designs.
of course the last aspect is that theses Samsung NX lenses don't perform as well as the Samyang. There no free lunch.
Samsung NX performance on photozone (20MP Samsung APSC body).
Samyang 14mm f/2.8 on photozone (on a 15MP APSC Canon body), didn't found the 16mm f/2:
The Samyang has much much better border at f/2.8 than the Samsung at f/3.2 and the Samyang look to be have lot of margin for more resolution body while the Samsung look to be already very limited by its optical performance.
Not all is said on this mirrorless vs DSLR body, the size difference in lenses comes more as different standard in quality as registration distance.