One good reason is to avoid "lens shadow" (aka "barrel shadow"). This
happens when you have the misfortune of using a camera-mounted flash together
with a long lens while taking a closeup. You can solve this by using one of
those old "flash extensions" that raise the flash about 4" (10 cm) above the
camera, use the flash on a coiled extension cable, or bounce the flash off a
bright object.
You don't see those Olympus flash extensions very often. I have a pair of
them, and here's one offered on evilBay with a T-20:
https://www.ebay.com/itm/Olympus-Flash-Extension-and-Electronic-Flash-T-20-used-Free-Shipping/283799748793?hash=item4213c880b9:g:eSkAAOSwNBleWoyY
>
>the original question was "why use a RING flash on a 100-400 eq."
>
>And after reading everyone’s answers I still can’t see its justification.
>
>It was just curiosity for I no longer have that lens, and have never had
>a ring flash.
>
>Sorry for bothering you all with this. We might simply forget :-)
>
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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