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Re: [OM] WTB 24mm f2 lens hood

Subject: Re: [OM] WTB 24mm f2 lens hood
From: Moose <olymoose@xxxxxxxxx>
Date: Thu, 23 Dec 2010 11:15:04 -0800
On 12/20/2010 9:46 PM, Dawid Loubser wrote:
> . . .
>
> Now that I've "switched" to the 21/2 instead of the 24/2, I somtimes still 
> put this hood on the lens. I suspect I will get slight vignetting, although 
> I've never actually *seen* vignetting with this combination, so it may simply 
> be academic. (*ducks as all the lens-hood-vignetting-aficionados on the list 
> cringe*).

Lens hood design depends in part on the distance from the mounting point back 
to the front nodal point. It may be that 
the difference in mechanical design between these Konica and Zuiko lenses is 
such that it's really a 21 mm hood for you. 
If so, it may also be slightly less effective on the 24/2 than it was designed 
to be on the Konicas.

Notice that it is marked for both 24 & 28 mm. That seems wrong at first glance, 
as they have different angles of view. 
But if the nodal point to front of hood distance is the right amount longer for 
their 28 mm lens, it could be correct 
for both.

> Olympus' 35/50mm chromed metal hood is a thing of beauty (mine is permanently 
> stuck to my 50/1.4)

A beauty indeed. And another example where the same hood works for lenses of 
significantly different focal lengths 
because of different mechanical/optical designs.

Geometrical Moose

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