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[OM] Zuiko 24-40mm f4 has arrived

Subject: [OM] Zuiko 24-40mm f4 has arrived
From: Paul Yates <paul@xxxxxxxxxxx>
Date: Sat, 29 Mar 2008 12:57:36 -0400
It has arrived!

Based on my preliminary analysis and measurements, I can confirm with 
nearly 100% certainty that this lens is a prototype based on the design 
in the patent discussed earlier. In the patent, it states a filter size 
of "about 55mm". This lens has a 55mm filter diameter, which is simply 
one more piece of supporting evidence on top of what I discussed earlier.

-----------------------------------------------------------------------
Specifications:

Lens name: Zuiko MC AUTO-ZOOM 1:4 f=24-40mm
Lens type: Two-touch wide-normal-zoom design
Focal length: 24-40mm
Max. aperture: f4
Lens construction: 11 elements in 8 groups, Multi-coated
Picture angle: 84 degrees (f=24mm) – 57.4 (f=40mm)
Diaphragm: 6 blades, automatic, full aperture metering
Aperture scale: f/4 – f/22
Distance scale  : Graduated in meters and feet from 0.6m to infinity (oo)
Focusing: Rotating helicoid system, by turning the focusing ring
Zooming: Rotating control via separate zooming ring
Filter size     : 55mm (screw in type)
Lens hood: unknown
Weight: 410g
Min. length: 66mm (at 40mm setting, infinity)
Max. length: 82mm (at 24mm setting, close focus)
Max. diameter   : 65mm
----------------------------------------------------------------------------

Notes on condition:

- Good overall cosmetics, with the exception of the filter ring dent, 
slight cracking of the zoom ring rubber and some other signs of light 
use and age.

- Aperture stops are crisp and the blades are clean, oil-free and snappy.

- Zoom ring is stiff(ish), but smooth. Not difficult to turn but 
certainly stays put.

- Focus ring is smooth and well-damped. Not to loose or too tight 
(typical Zuiko) but towards the tight side.

- Mount shows a bit of wear.

- Exposed front and rear element surfaces are clean, scratch-free and 
the coatings look in perfect condition.

- The inner 2 or 3 elements of the first group have significant haze 
(significant enough to reduce contast quite heavily in photos).

- The mid and rear groups look pretty clear.
------------------------------------------------------------------------------

Overall I am very pleased. The filter ring dent can be easily fixed and 
I am pretty sure I can go in through the front and clean up the haze in 
the first few elements. I have done this sort of thing before.

Here are some photos I took of the lens this morning. I've taken a 
variety so you can all get an idea of the size of this lens.

http://www.cogitech.ca/photos/Zuiko_24_40/img_1649.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1653.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1655.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1658.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1659.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1661.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1662.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1663.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1665.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1667.jpg

http://www.cogitech.ca/photos/Zuiko_24_40/img_1671.jpg

These are straight from RAW using BibblePro only.

Anyone who wants a RAW for proof that I didn't sit and waste dozens of 
hours faking these photos will need to e-mail me and I'll send a link to 
download the RAW. I share bandwidth with other people, so I am not about 
to post the link here to a 12MB RAW file. Hope you understand. Just 
e-mail me and I'll happily send the link. If I see bandwidth getting out 
of hand, I'll have to remove the RAW.

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