Is it possible to protect a bulbous lens while shooting?

Question

The Canon TS-E 17mm F/4 has a bulbous front element which protrudes from the lens barrel. This requires a special lens cap which I place diligently while not shooting but there is no head and even no filter-thread.

Can this lens be protected while shooting? If so, what options are available?

Answer 1

I looks like you are very limited and you would have to create something custom that extends the lens chasis.

According to this review

There is no lens hood available for this lens (Canon recommends using a piece of cardboard to shade the lens). There are no filter threads provided. And I can tell you that extra care is required to keep that bulgeous glass pristine. Strong recommendation: the supplied and very protective lens cap (shown in the product images below) should be in place unless the lens is actively being used.

and

The angle of view and the usable image circle (more later) from the Canon TS-E 17mm f/4 L Tilt-Shift Lens are such that a lens hood is not practical - and one is not included. Included is the unique bayonet-mount, wrap-around protective plastic lens cap - with a strap (The manual warns against carrying the lens by the strap - thanks).

In terms of custom you could buy one of these and chop the end off - and extend past the glass

UPDATE: According to this site - under TSE Lenses a L lens guard cap covers this lens