Such a list would certainly be useful, but I don't know of one. On the
other hand, I think it's fair to assume that Oly only produced different
hoods when it was actually necessary for optimum performance. Several of
the hoods were made to cover more than one lens. There are several such
combos. Particularly significant are the 85/2-100/2.8 hood which later
was extended to the 40/2 and the clamp-on hood for the 50/1.8/1.4 and
35/2.8 which later worked for the 50/1.2 (without fitting reversed) and
the 35-70/3.5-4.5. I think their track record suggests that where one
hood would work properly for multiple lenses, they said so, rather than
marketing a new model number for the new lens.
In addition to the eSIF list of hood compatabilities, there is this
reference
<http://brashear.phys.appstate.edu/lhawkins/photo/zuiko-lens-hoods.txt>.
A list of internal diameter and overall length of Oly hoods would be
useful at least for adapting generic hoods where the proper hoods are
really hard to find. Rear lens nodes are quite easy to find, being at
the focal length forward from the film plane when focused at infinity,
but determining front nodes seems trickier and I've neve seen the info
published.
Of course adding to the distance from the front node to the front
diameter of the hood with a filter, etc. can lead to vignetting. Most
hoods above 21mm seem to allow for one normal thickness filter without
trouble.
Moose
tOM Trottier wrote:
Is there a list anywhere which lists
- how far behind the filter threads the front nodal point is
- how deep hoods are
- how wide hoods are
Then it would be easy to determine which hoods will work with which lenses.
Does filter thickness, or number of filters, affect this ?
tOM
On Sunday, May 18, 2003 at 1:32
Moose <olympus@xxxxxxxxxxxxxxx> wrote:
It's simply geomerty and complex optics. If the front focal node of the
lens has a different physical relationship to the filter threads, the
angle of view will require either a narrower or wider hood.
Moose
Titoy wrote:
In fact that happened to me, why? both lenses are 28 mm focal length anyway.
----- Original Message -----
From: "Matt BenDaniel" <matt@xxxxxxxxxxxx>
The 28/2.8 hood vignettes the corners of a 28/2.
At 23:29 17-05-03 -0400, Stephen Rosenblum wrote:
I just bought a 28/2 lens. I already have the hood for the 28/2.8. Any reason
why I shouldn't use the hood on the 28/2?
---------
2003 Jun 28-30 in Ottawa:
http://www.CanadianCameraConference.ca
tOM Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412 W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
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