olympus pen w -- optical diagram ??? search

[enasniearth]

does any one have or can locate the optical formula for the e zukio 25mm f2.8 on the pen w . this is the 1964 point and shoot with the higher quality lens .
i know the pen s is a elmar/ tessar type 4 element . one web site states 6 elememt for the zukio on the pen w . thanks

 

[Cale Arthur]

Here ya go..

 

[OlympusRF]

Removef from a japonese site and translated to english in google:

http://homepage1.nifty.com/olympuspen/index.html#TOP

Pen W Close Up1

-General-
Pen W was born in 1964(1964) after five years of the Pen sale. It is a model planned as a machine of the diversification of the Pen series only for the wide angle of an inside and a professional aim. The number of manufacturing is comparatively few models for 1964-1965 years and only two years the subscription period. Moreover, this Pen W is an unusual model from whom only a black specification is sold. It is more common than Pen excluding unlike the shutter, the lens, and painting. It has dealings in the secondhand market because the number of manufacturing is few by a considerably expensive price.

I will introduce Mr./Ms. Yoneya, designer's own explanation described in the photographic industry.
A wide Olympus pen is ..".. applying of E [zuiko-] W to the body of the pen. Therefore, the main body relation besides the finder follows the current pen. There is not writing in [sarakoko] now either I have already thought that black finish also makes wide lens E [zuiko-] W more wieldy together on the small easiness that a current pen of proof has to use of the structure by a lot of regular users though it will omit.
The nova of the wide fan expectation of one appeared again in the field of a sub-camera that was one of the first purposes to develop the pen camera by this. [FONT=MS Mincho, ＭＳ 明朝, monospace]｣[/FONT]
Specification
Sale years:September, 1964 (1964)
Lens:Five E.Zuiko 25mm F2.8 3 crowds
Shutter: Copal # 000 B and 1/ 8 -1/ 250 seconds
X point of contact and German type synchronized socket
Focus adjustment:Rotation Helicoid 0.6m - Infinite eye measurement type
With double-clicking stop
Finder: Reverse-Galilei lighting type Bright Frame 0.5 time
Film sending:Rear Winding and Self Cocking expressions
Size:108X68X40mm [FONT=MS Mincho, ＭＳ 明朝, monospace]､[/FONT]380g
Sale price:10000 yen

-Lens-
The lens installed in Pen W is three crowd five piece composition of E.Zuiko 25mm F2.8. It becomes the wide-angle lens of 36 considerable mm if it converts it into the full size 35mm. Because original Pen is semi-wide angle 28mm(It is 40mm in the full size conversion) field angle (note1), I think that it uses Pen W easily so that I of the amateur may take the snap in the whole town.
Please do check for the performance of the lens like this [mametsubu] (note2) no "Private lens test/wide angle of [zu] (note3) ..in time.. trap" by all means. It is efficient surprisingly. The policy of Mr./Ms. Yoneya (note4) "Lenses alone are not stinginess" might be succeeded for Pen W. To begin with, Pen F existed in the development background of Pen W. It was clarified that it was inevitable and a designer = natural result for Mr./Ms. Yoneya (note4) that the duplicate performance of Pen W was very excellent in the future. I will introduce this matter by "Overview" at the end on this page.
One mystery is here. In it, why is the lens of Pen W a focal length of 25mm?Thus, it does. Mr./Ms. Yoneya (note4) is talked about in "Photographic industry" in 1964 for this matter as follows.
The first becoming the problem when a wide camera is designed is where to put the focal length of a lens. Please ..".. look at "Comparison table of focal length and field angle (note1)". It thought about the standard lens group including a semi-wide angle and semi-[hasa] corners based on 47 degrees in 35milli size established by Ichi floatage Leica in 50milli standard lens picture corner (note1), and it thought the one whose field angle (note1) is wider than it to be a wide lens though it was thought that be which was had and it was assumed the standard lens variously also the opinion.




The camera of the size of the pen almost uses a semi-wide angle lens excluding pen F of the single lens reflex when doing and arranging it the request of the omission. The Olympus pen that develops the size of the pen first possibly seems to use 28milli stroke 56 degrees of a semi-wide angle in corner (note1) from the depth of the focus depth and the miniaturization of the camera. Then, does it only have to be used for a wide pen the lens of milli how many?It becomes an important key point though it is understood only to have to use lenses that are shorter than 28milli as shown in the comparison table how it makes it to the wide angle. Still most I see ..use.. when the announced winning piece of work is examined about a wide lens for 35milli a lot of kinds of sizes that are in the past. ..focal length.. lens of 35milliIf this is converted into the size of the pen, it becomes 24.3milli. The stern thought that the image's becoming smaller for the pen with only half 35milli size area became disadvantageous by enlarging a large magnification even if it pushed from current film circumstances about the width a little more for the size of the pen for which a semi-wide angle was often used though thought. Generality in the wide angle is demanded from the camera only for the width not to be able to do the lens exchange. Then, it decided it to the use of 25milli lens of 62 degrees in field angle (note1) with most use levels. [FONT=MS Mincho, ＭＳ 明朝, monospace]｣[/FONT]
Moreover, the hardship concerning the design of the E Zuiko 25mm F2.8 lens installed in Pen W is written to Mr./Ms. Yoneya (note4) in this photographic industry magazine.
To build a short lens of 25milli into the body of the pen, the brightness of F2.8 ..".. ..focal length.. is still demanded from the camera only for the width in the future for behind though the 000th considerable limitations are undertaken from the shutter etc.It is likely to enter a bright class as field angle (note1) 2.8 and wide lens of 62°F. The curvature of field considerably grows if the [tessa-] type of four piece composition (type adopted with Pen and Pen S) is used for this, and the crumble of the image is caused in the middle belt of the screen or the part in the surrounding. Especially, it collapses rapidly in the part in the surrounding. If the curvature radius of each lens is reduced to take this image curve, the spherical aberration from the size of the caliber ratio named F2.8 increases rapidly, and it becomes ..fog.. flared and a lot of in the taken photograph. It is necessary to take the curvature radius of each lens greatly contrary to ahead to reduce this spherical aberration, and the result should deteriorate the curved field.
To make a wide lens of focal length 25milli F2.8 the one that the photofinishing of a large magnification can be borne, it seems to be a little impossible like the [tessa-] type of four piece composition. Then, the spherical aberration was able to be corrected to F2.8 without preventing the refraction of each lens from becoming small though the curvature radius was greatly taken by adding the improvement to the [tessa-] type by separating the front lens to two pieces, and using the new kind glass that contained the rare element with a high refractive index, and deteriorating the curved field like being enough. Besides this, there is no what to other aberrations to say nothing of the correction of the distortion that tends to occur to a wide lens are corrected well up to saying. A clear flared image that not is is connected when copying it. A slash part is the new kind glass though chart 1 is the block diagram.
It is necessary to make the shuttlecock of the shutter approach behind the lens as much as possible so as not to cause the decrease in the peripheral brightness with the behind shutter when this lens is built into the body of the pen. If a short like this lens is brought close to the shutter shuttlecock, space that the squeezing shuttlecock etc. that cover F2.8 enter becomes very tight because the lens completely enters the shutter.
Moreover, because the decentering of the lens or other accuracy was reverse-do proportion to the focal length and became difficult, too such respect was sources of hardship. Chart 2 shows the section of [kagamiwaku]. [FONT=MS Mincho, ＭＳ 明朝, monospace]｣[/FONT]
-Shutter-
Five piece type of the wing of the shutter of Pen W is equal to the one installed in Pen S. 000 # [puronta-] type that two piece barrio type of the wing uses and pursued [waretema****aga] and a more high-speed performance is used for original Pen. Please read through Pen S2.8 Shatter about the explanation of this shutter.
A left image saw five shutters of the wing.
It is understood that parts that the volume removing spool of it and W is different from original Pen are used (No do be known only whether the color is different). There is a considerable difference in the feeling of rolling up by a rear winding though the feeling of [reri-zu] hardly feels the difference when Pen is compared with Pen W (Cut extremely lightly by feeling named [chi]). Really Pen was rolled up, made heavy a little by the finality distance or Pen W has the sense named [shatta-cha-ji] it though it is feeling of - and [kurai]. It obviously becomes heavy compared with the lightness of Pen though it is not wonderful weight. Most though it is a very light rolling up feeling compared with the weight that D series [gorigori]ed.
-Top Cover-
All are common with Pen when concerning besides the lens, the shutter, and the painting that has been introduced so far (The character of OLYMPUS PEN W of a top cover was different). The film counter, the rectangular shutter button, the accessory shoe, and the rewinding knob of the type of a manual counting backward queue up in the top cover part as well as Pen. The finder is a reverse-Galilei type lighting finder.
By the way, a poor quality of black painting of Pen W comes off soon too famous, and really. From [renzu] [shi] (note3) to the one this inherited Pen W of which everything painted again ..me.. ..in time..Four corners gets bald without finding the mistake, and I think that thinking cannot assertion as overwork is more natural of W usually used.
-Bottom Cover-
The bottom side is such feeling, and after it is the same as Pen, the lid pulling down type. The lock release knob, three hole, and the rewinding button of the lid queue up.

-Overview-
How if this Pen W was announced as Pen when Pen was put on the market? be going(Though there is a problem of the price. )It thinks without permission.
If anything, field angles (note1) of Pen are eyes that are a semi-wide angles of the expert taste or standard, and it is thought that Pen W with wide angle or more eyes turns to take it, and comes out from the snap to take a picture with [bashibashi] also the light feeling at which Pen originally aimed. I think that having wrapped in dressed in black leads to the expansion of the taking a picture area in no small way.
However, this Pen W would lower the act in only two years why, and the succession model did not appear at last either.
Mr./Ms. Yoneya (note4) is talking about the development background of this Pen W as follows. Pen F ..".. was sent off as a high level machine that was able to make good use of the interchangeable lens from the width to 800milli super-hope [too] freely. It is popular so that the goodness not thrown away easily is in pen F, and a lot of masterpieces might arise, too. However, it is actually complex if a few lenses are arranged and it uses it while exchanging it, weight might be also heavy, and it end in the result rather used for the camera. As for the telephoto lens, I feel the doubt when it will have to be a single lens reflex from which the focus is precisely matched to a focus depth deep, wide lens even if it is unavoidable, and even the condition of the chaenomeles speciosa is seen in such a case. Then, having appeared putting up a wide lens of the new design is this pen W. On the other hand, it has pen F that puts the zoom, and, on the other hand, using it for a sub-camera in the high-class of pen W is a purpose. Therefore, it finished it up in black paint suitable for a sub-camera. The size of the pen and that of wide Olympus before are these pens W. [FONT=MS Mincho, ＭＳ 明朝, monospace]｣[/FONT]
Postscript:Answer from Mr./Ms. Yoneya (note4)
Q1: Why was only a black specification sold?
A1: Because the professional and the advanced amateur photographer user were made a sales target.
Numbers of sales for Q2😛en W?
A2: There is no material that can be disclosed. It is the comparatively few numbers of production.
The reason for price difference (1200 yen) with Q3😛en S?
For A3:E.Zuiko25mm lens and black painting
Far efficient translation from opening compared with 25mmF2.8 for Q4😛en F
Because the necessity doesn't exist, W : though A4:F is a single lens reflex and the retro focus. However, our company doesn't think that the performance difference exists in it.
Q5: Why did you assume the sales termination at a short period of two years?
A5: Because sales were inactive. It is judged that the layer where the relative value can be found to 10000 yen of W was few compared with 6000 yen of Pen.
Pen W Close Up ends by this.
note1=angle / note2=small beans / note3= Mr.Lens Mania / note4=exact Mr. Maitani





Research:Pen W was manufactured for about nine months from September, 1964 to about May, 1965. The number of manufacturing of the monthly production is expected about 2300 averages, and the number of a total manufacturing seems about 21000. The serial number is regarded from 100001 to start 121XXX stand. Various..model..extremely..manufacture..number..few..model..say.We will wait for information on your Pen W. Please see Research.

 

[enasniearth]

pen w

pen w

thanks for the above ,
from what is written the lens in the pen w is a 5 element in three groups type .
it appears to be an advancement on the tessar ( a good starting point )
perhaps the e zukio is short for five element ( fifth letter of english alphabet )

the translation is a little hard to read , however much good information .

 

[enasniearth]

optical diagram

optical diagram

it took awhile to find it on the site you listed .
the lens diagram was there and thanks once again.

 

[OlympusRF]

were here to help each other as we can...
I'm trying to buy one at almost 2 years, but they are so expensive, and only seen about 4 cameras on ebay

 

[Requin]

I found the lens diagram and a MTF-curve for that lens. Horizontally are lines per mm, verticalle contrast in %. It's a good and contrasty lens. Have fun !

 

[Requin]

I've to add a few words to the MTF-curve. M stands for middle and R for edge or border of the lens The numbers 2,8 and 5,6 define the aperture used.
MTF = modulation transfer function.
Enjoy.

 

[Requin]

Sorry, these charts belong to the 2,8/25 mm Auto-W G-Zuiko lens, which was a wide angle lens for the half frame pen f/ft

 

[Roger Hicks]

It's certainly a wonderful lens, and the body on mine (s/n a couple of hundred under the 121,000 mark) certainly suffers from famous bad black paint. The leatherette covering hasn't looked too good, either, since I had it overhauled. Does Cameraleather do a replacement?

I knew they were highly regarded, but what do they go for?

Cheers,

R.

 

[twopointeight]

I sold a Pen W here on RFF a few months ago for about $200, pretty good price, I thought? It had a lot of wear but worked well. I have another in better shape, but has an intermittent spacing issue between frames. My local repair person in Seattle couldn't fix it. Any suggestions for repair person with Pen experience? This is a great camera for the big city or travels anywhere.