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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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 Posted: Mon Feb 27, 2012 4:39 am Post subject: The optical diagram for the Sigmatel 135mm f1.8 |
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DSG wrote:
EDIT: Please scroll down for the updated optical diagrams...
Last edited by DSG on Wed Feb 29, 2012 12:47 am; edited 2 times in total |
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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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| Posted: Mon Feb 27, 2012 4:40 am Post subject: Re: The optical diagram for the Sigmatel 135mm f1.8 |
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DSG wrote:
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Last edited by DSG on Wed Feb 29, 2012 12:49 am; edited 2 times in total |
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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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| Posted: Mon Feb 27, 2012 3:22 pm Post subject: Posted a review for the Sigmatel on the Pentax forums... |
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DSG wrote:
http://www.pentaxforums.com/userreviews/showproduct.php?product=991 |
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AMDBill
Joined: 09 Feb 2010
Posts: 109
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| Posted: Mon Feb 27, 2012 3:52 pm Post subject: |
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AMDBill wrote:
HELLO,
you ve still post these photos in 2008 ? no !
and in 2010 a new topic was open and we determine that there re 4 lenses shemes for these fast 135/1.8, see here http://forum.mflenses.com/its-huge-porst-135-1-8-t24111,highlight,+porst++135,start,15.html
i still have mine and love it for portraiture |
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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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| Posted: Mon Feb 27, 2012 7:38 pm Post subject: |
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DSG wrote:
Thanks for the headsup! 
EDIT!
I have now revised my optical diagram image:
Last edited by DSG on Tue Feb 28, 2012 4:46 pm; edited 1 time in total |
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nixland
Joined: 30 Jan 2011
Posts: 577
Expire: 2012-07-29
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| Posted: Tue Feb 28, 2012 5:03 am Post subject: |
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nixland wrote:
Thanks for sharing.
Very very interesting info. I first thought that all old 135/1.8 lenses (except Pentax-A) have the same diagram 
I had a Mitake 135/1.8 but already sold it last year.
Excuse me to add the diagram of Zeiss 135/1.8, just for adding comparison list
Taken from: http://www.dyxum.com/lenses/detail.asp?idlens=300
I still can not find the diagram of Pentax-A 135/1.8 ....
_________________
Carl Zeiss Jena: Biotar 58/2 1Q, DDR Pancolar 80/1.8 MC, Biotar 75/1.5, Biotar 10cm/2, DDR Sonnar 135/3.5 MC
Carl Zeiss C/Y: Planar 50/1.4 T*, Planar 85/1.4 T*, Planar 100/2 T*, Sonnar 135/2.8 T*
Leica: Summicron-R 35/2 v1, Summicron-R 50/2, Summilux-R 80/1.4, Summicron-R 90/2
Pentax: A 50/1.2
Minolta: Rokkor MC 58/1.2, Rokkor MC 85/1.7, Rokkor MC 100/2, MD 200/2.8
Olympus: Zuiko MC Auto-W 21/2, Zuiko 50/1.2, Zuiko MC Auto-T 85/2, Zuiko Auto-T 100/2
Nikon: Nikkor 28/2.8 Ais, Nikkor 85/1.8, Nikkor 105/1.8, 300/2.8 ED (Ais)
Canon: FD 50/1.2 L, FD 85/1.2 L
Sony: 135/2.8 STF
Jupiter: 85/2 Alu
Cyclop: 85/1.5
Meyer-Optic: Trioplan 100/2.8, Orestor 100/2.8, Primotar 135/3.5
Samyang: 8/3.5 FE, 14/2.8, 85/1.4, 85/1.4 UMC
FOR SALE
Carl Zeiss Jena Biotar 10cm/2 || Carl Zeiss ZE Distagon 28/2 || Minolta Rokkor MD 35/1.8 || Rokkor-X MC 85/1.7 || Rokkor MD 85/1.7 || Olympus Zuiko MC Auto-W 21/2 || Olympus 100/2 || Nikon Nikkor 35/1.4 || Canon: FD 55/1.2 || Vivitar 90/2.5 Series 1 VMC || Tamron: 90/2.5 SP
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aoleg
Joined: 22 Feb 2008
Posts: 1389
Location: Berlin, DE
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| Posted: Tue Feb 28, 2012 7:30 am Post subject: |
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aoleg wrote:
| nixland wrote: |
| I still can not find the diagram of Pentax-A 135/1.8 .... |
From http://kmp.bdimitrov.de/lenses/primes/_optics/135f1.8.jpg
_________________
List of lenses |
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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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| Posted: Tue Feb 28, 2012 4:56 pm Post subject: Now there are six different optical designs! |
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DSG wrote:
Thanks very much to Nixland and Aoleg for those optical diagrams!
Its a case of "the more, the merrier" so if you know of any more differing optical diagrams for other 135mm f1.8 lenses please post them here...Hopefully I will be able to incorporate them all into a single image. 
EDIT!
OK, here are those two put into the same format for easy comparison:
It seems Pentax must have been very impressed with the Sigmatels optical design and so they decided to copy it...Its almost identical except for one extra element! (or did Sigma copy Pentax?) |
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