From: Igor Roshchin
The rear lens cups for Pentax and Tokina lenses are made so that
can be attached in all three angular orientations (corresponding to
the three tabs).
I have a Tamron lens (70-300) that has a cap that is "polarized",
and can only be attached in one position. Just recently I discovered
that several Sigma lenses come with the same sort of rear caps.
So, the question is why do they "polarize" the cap? It makes
it so much more inconvenient to put the cap on with one hand...
Any insights?
With the Sigma lenses it's because Sigma uses a K-mount bayonet that's
rotated 120 deg for their own lens mount. I don't know why the
"polarized" rear lens cap matters, because standard Pentax rear lens
caps fit Pentax mount Sigma lenses.
But, I don't know if Pentax rear caps would fit Sigma mount lenses,
because I don't have any Sigma mount lenses.
Do the polarized Tamron caps indicate another position for another
brand's mount? I've got one Tamron lens, so I've probably got a Tamron
rear lens cap around somewhere, but I expect it's relegated to my junk
drawer back in Raleigh. I'm trying to replace all my rear lens caps with
a specific Pentax rear lens cap.
Pentax made a rear lens cap that looks like a hat with a brim and those
are the best fitting rear lens caps I've ever found for Pentax K-mount
lenses, whoever the manufacturer is.
http://preview.tinyurl.com/4m8ulxb
They don't seem to jar loose like other rear lens caps do. Only problem
is it's kind of expensive to replace all of your rear lens caps with the
good ones and I haven't quite managed to afford it yet.
It's another one of those things I always look for whenever I find a
still operating independent camera store - do they have old Pentax rear
lens caps stashed away?
I've been able to get them 3 for $10 that way instead of paying $11.00
apiece for them.
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