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List of lens diagrams: triplets, planars & hybrid lenses
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PostPosted: Tue May 10, 2011 9:24 pm    Post subject: Reply with quote

no-X wrote:
That's quite atypical lens. I have never seen it. The lens diagram is also a bit uncommon - retrofocal lenses often have negative front elements. It could mean, that the lens is quite late optical design based on modern types of glass.

Does it state something like "made in ..."?


It is not so atypical, Nikon makes such wide angles lenses. Ai20/2.8S &
Ai24/2.8S for example. They say in the lens brochure, the first positive
element makes "wide angle" lens physically smaller. See>



This is for Ai AF Nikikor 20mm F2.8S, same as Manual Ai Nikkor 20/2.8S.
Ai24/2.8S has similar lens block diagram, so as AF 24/2.8S they are
optically same. And famous Flektogon 20/2.8 has a positive front element!!
And this Flektogon 20mm is much smaller than its brother Flektogon 25/4.

Btw, you have done a great work.


PostPosted: Tue May 10, 2011 11:03 pm    Post subject: Reply with quote

I was also very curious, so I disassembled my Prakticar 28/2.8 (plastic version).
(I have three Prakticar 28/2.8s, the other two are metallic construction.)

Optical block diagram looks like in RED.
(black one is Orestgor 29/2.8 )



The first element has very strong negative, aperture is between 3-rd and
4-th element, I am not quite sure about 2-nd and 3-rd element but they
form very strong positive power. Yes, the lens has 7 element and 7 group.

in short:


The second and third elements are much closer than this diagram indicates, I think.


PostPosted: Wed May 11, 2011 12:42 am    Post subject: Reply with quote

Guys, I've made the offer before, but I figure I should again since it's been so long ago. I have the Cooper books for both Nikon and Minolta system and the Canon F-1 book. Each of these books shows lens diagrams for all of the current lenses as of the date of their publication. In the case of the Nikon and Minolta books, these dates are probably sometime in the early 1970s (non AI Nikkors for example, and no MD Rokkors -- just MC), but the Canon books I have go to 1977 I believe, so they include all of the breechlock FD lenses.

So if you are interested in any of the lens formulas that were current during these time frames, let me know. I can scan them and post them here for your perusal.


PostPosted: Wed May 11, 2011 6:04 pm    Post subject: Reply with quote

cooltouch
Is there any 4 element teleconverter on this book?
Thank you.


PostPosted: Wed May 11, 2011 6:36 pm    Post subject: Reply with quote

Good question. I looked for teleconverters in both Joseph Cooper publications (Nikon and Minolta) and in the Canon F-1 Guide. In one of the Nikon books, Cooper discussed teleconverters at some length, and mentioned that Nikon did not make any. This was back in 1974, so pre-AI days. Coopers books on Minolta were copyrighted 1972, 73, and 76, and showed only MC lenses, and his book showed no teleconverters either. The Canon F-1 guide showed a 2x converter along with a few of its fluorite telephotos, and while the book showed the optical formulas for the teles, it did not for the 2x. Oh well. I tried.


PostPosted: Wed May 11, 2011 8:10 pm    Post subject: Reply with quote

cooltouch
thank you for the search!
I think that teleconverters are not much "well seen" from the manufacturers, just in case that it could be sold and make money.


PostPosted: Wed May 11, 2011 9:21 pm    Post subject: Reply with quote

Interestingly enough, I did a google search on the topic, looking at the "images" and found quite a few optical formulas for 7-element TCs, but none for 4-element TCs.


PostPosted: Thu May 12, 2011 2:48 am    Post subject: Reply with quote

cooltouch
I did the same, but with no success.
The modern canon 1.4x TC use 4 element, but I didn´t saw any diagram, just some specs.
I´d found some 5 elements TC but in this case reference isn´t enough.
The vivitar series 1 also have one 4 element TC, but there´s no more info about it.


PostPosted: Thu May 12, 2011 4:29 am    Post subject: Reply with quote

kelsonbueno wrote:
cooltouch
I did the same, but with no success.
The modern canon 1.4x TC use 4 element, but I didn´t saw any diagram, just some specs.
I´d found some 5 elements TC but in this case reference isn´t enough.
The vivitar series 1 also have one 4 element TC, but there´s no more info about it.

The canon 1.4x II use five elements four groups.
http://www.canon.com.hk/en/product/catalog/productItemDetails.do?categoryID=25&seriesID=10034&prrfnbr=349


PostPosted: Thu May 12, 2011 5:13 am    Post subject: Reply with quote

My mistake!
I found this nice info about tele converters!
http://www.pierretoscani.com/echo_focal_length.html#FocalLength07


PostPosted: Mon Jun 20, 2011 8:03 am    Post subject: Reply with quote

nixland wrote:


Summicron 90/2 looks like 5 element Takumar?



Nope. Canon Tele lens patented in 1960 by the great Jiro Mukai, see here: http://www.google.com/patents?vid=USPAT3066575&id=jMBjAAAAEBAJ&pg=PP1&dq=jiro-mukai#v=onepage&q&f=false



This is quite interesting because it prevented Nikon 18 years bringing a short 85/1.8 to the market. They kept with a large Gaussian 85/1.8, or the Sonnarish 105/2.5. Then they took nearly the same formular. (Nikon F AI/AIS 85/2 1977-1995) (alike focussing helicoids, Nikon makes things reversed here...)


The Takumar 85/1.8(1.9)

was a "classic" Ernostar design, retrait from a Sonnar type. Not bad, since this design is still widely spread. But optical correction of the Canon was superior by a wide margin.

BTW, in the main diagram the Canon RF 50/1.5 is missing among the 7 elements Sonnars.


PostPosted: Wed Jul 06, 2011 8:54 pm    Post subject: Nikkor 50/2 (H, H.C, K and AI) to add att Biotar/Xenon list. Reply with quote

Nikkor 50/2 (H, H.C, K and AI) to add att Biotar/Xenon list.

A very common lens on the s-h market and an cheap one to. F-mount makes it usable on a lot of things using 24x36 or smaler.


Bad link or am I doing something wrong? Test this:

http://www.flickr.com/photos/37824513@N08/4961516527/in/set-72157623666967030

WTF, it wont even take a link?!?


Last edited by Irrbloss on Wed Jul 06, 2011 8:58 pm; edited 1 time in total


PostPosted: Wed Jul 06, 2011 8:58 pm    Post subject: Re: Nikkor 50/2 (H, H.C, K and AI) to add att Biotar/Xenon l Reply with quote

Irrbloss wrote:
Nikkor 50/2 (H, H.C, K and AI) to add att Biotar/Xenon list.

A very common lens on the s-h market and an cheap one to. F-mount makes it usable on a lot of things using 24x36 or smaler.


quote for first poster


PostPosted: Wed Jul 06, 2011 8:59 pm    Post subject: Reply with quote

I dont understand what went wrong but thanks for geting it done for me!


PostPosted: Wed Jul 06, 2011 9:00 pm    Post subject: Reply with quote

Irrbloss wrote:
I dont understand what went wrong but thanks for geting it done for me!


Antispam measure, image links for the first post of a new user don't work. You'll be fine now. Smile


PostPosted: Wed Jul 06, 2011 9:06 pm    Post subject: Reply with quote

Ahhh...well thats good to know.


PostPosted: Thu Oct 20, 2011 6:38 pm    Post subject: Reply with quote

#1


PostPosted: Fri Mar 22, 2013 10:46 pm    Post subject: Reply with quote

Beautiful chunky cemented elements that give lenses the edge: Pentacon (Meyer) 2.8/135mm and Jupiter 4/200mm.




PostPosted: Fri Mar 29, 2013 4:27 pm    Post subject: Reply with quote

I didnt see anything about Mir 1 37/2.8
http://www.ussrphoto.com/Wiki/Content/files/693/Mir_1V.pdf
http://www.ussrphoto.com/Wiki/Content/files/693/Mir_1V_v2.pdf
more here:
http://www.ussrphoto.com/Wiki/default.asp?WikiCatID=84&ParentID=4


PostPosted: Mon Apr 22, 2013 9:26 am    Post subject: Reply with quote

It seems to me both Meyer / Pentacon Orestor 2.8/100mm and 2.8/135mm are still listed as Primoplan designs with wrong scheme.
Both lenses have nearly the same design (135mm in my previous post):


Orestor 2,8/100 by alf sigaro, on Flickr


PostPosted: Sun Feb 15, 2015 8:19 am    Post subject: Reply with quote

One can find somewhere this pdf? Excellent these previous lists.

no-X wrote:
Relayer: Done

+ added some other designs: fujinon/unar, elmar, orthoscope, tair, hektor, telyt...

list of triplets, v.5:



PDF: high quality / optimized


PostPosted: Sun Jul 05, 2015 3:06 pm    Post subject: Reply with quote

Spotmatic wrote:
Tremendous work, thank you! I have stored it locally for future reference.


Here too. Thank you very much for that valuable reference.


PostPosted: Mon Jul 06, 2015 12:28 pm    Post subject: spherics adieu! Reply with quote

looking at these lens desings for smartphones makes me drunken:
http://bit.ly/1yrwgiM

link comes originally from Zeiss page:
http://blogs.zeiss.com/photo/de/?p=5280

Kind regs
Thomas


PostPosted: Mon Jun 11, 2018 11:42 pm    Post subject: Reply with quote

Does anyone know what optical scheme has the Color Lanthar 50 2.8 of the Voigtlander Vitoret DR?
Thank you very much.


PostPosted: Tue Jun 12, 2018 3:50 am    Post subject: Reply with quote

francotirador wrote:
Does anyone know what optical scheme has the Color Lanthar 50 2.8 of the Voigtlander Vitoret DR?
Thank you very much.

It is a triplet.