EB-1 Offline Upload & Sell: Off
|
mitesh wrote:
I would be thrilled to see a 600/4 DO or 800/5.6 DO. Instead of built-in teleconverters, I would prefer if Canon could find a way to develop standalone teleconverters that have an engagement switch like the built-in teleconverter on the 200-400. That way you could have a set of removable extenders that you can use with all your lenses. It would also allow you to minimize the lens size if you're traveling, whereas if the extender is built-in, then you can't recoup any space savings. Would be great to have a 600/4 DO with removable 1.4x and 2.0x extenders that you could mount in tandem, and then just engage or disengage as needed with the flip of a switch. It would be the closest thing to a super-telephoto zoom in that you would have 600mm, 840mm, and 1200mm available to you without having to mount/dismount extenders. I think that would be a huge benefit in the field.
...Show more →
johnctharp wrote:
What you're talking about is a 'zoom' converter that can change between 1.0x and an extended magnification. If you just move the converter out of the optical pathway, what you'd have is an extension tube .
mitesh wrote:
That's why it would require some type of development effort. Removing the glass from the optical pathway creates an extension tube, as you said, and that's not desirable. I have no idea if this is feasible or not, but hey, it's a gear forum and it sure sounded cool in my mind .
The optics would need to be designed to focus with the empty tube (TC off to the side) in place. There would have to be an empty tube if the TC is not used and one doesn't want to carry the extra weight of the TC. However, the structural integrity of such a tube is not ideal in a long lens.
I'm sure some of you remember the old 2-piece Leica big teles which allowed a range of FL and apertures.
EBH
EBH
|