I hope the built in teleconverter will become standard equipment in lessor lenses as newer replacements are made in the future. It would be nice to see a multi-teleconverter in a single lens i.e 1.4x + 2.0x + 3.0x.
While this is a nice idea, all the lenses will then cost at least $1000 more.
Any expert can share why long zoom lens always so big? With the same fov, a high grade binocular or scope can be much smaller.
Bins and scopes are designed for the pupils of our eyes which are in the range of 3-5mm, allowing for dilation. Telephote Camera lenses are usually FF and the image circle has a diagonal of 43mm. To focus the camera need about f/8 so with a focal length of 1000mm the aperture would be 1000/8=125mm with a correspondingly bigger front element.