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.
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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
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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.
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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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