Originally posted by v5planet SOldBear -- it looks like you have a filter on beneath the lens cap? That would obviate the concerns about clearance between the front element and the cap's underside. Or am I misinterpreting the image?
No. There is no filter. I generally don't use filters, unless when I have to.
There is no problem of the front element of the lens touching the underside of the cap. I tested by applying a bit of vaseline under the lens cap and put the cap on. The vaseline was not transferred to the lens. If you're still concerned, but don't want to use a filter, take the glass off from an old filter and use just the ring.