You could glue black felt on the inside.
Have you tried to run some tests to see if the hood is contributing to flare?
>Subject: [OM] Rubber lens hoods shine
> From: W Shumaker <om4t@xxxxxxxx>
> Date: Fri, 07 Nov 2003 10:36:06 -0500
> To: olympus@xxxxxxxxxxxxxxx
>OK, enough of this digital stuff. I can't afford to think about the E-1
>at the moment. So here is an OM question.
>I've been using the 35-105 rubber lens hood on my 90/2, partly
>for protection and partly in the belief that it improves flair. However, I
>have noticed on some of my longer exposures in diffuse light a
>decrease in contrast. I was wondering if the rubber hood is actually
>bouncing light into the lens. Gary R had mentioned problems with
>rubber hoods, but I thought that was with a direct light.
>So, is there a way to improve the 'blackness' of the rubber hoods?
>The effect is subtle, how can I best test the effect of the hood on
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