What is your most recent (alt) lens purchase?

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m-a-x
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p.88 #1 · What is your most recent (alt) lens purchase?

Great job sebboh! Very neat!
This is very interesting for me. I instantly have some questions...
Did you manufacture that ring yourself, that centers the lens at the front (the flat one with the two holes)?
How would you approach to transfer the aperture values? By measuring the light with a camera meter, or by holding the G45 aperture ring side by side to the Rokkor aperture ring and making the marks?
Thanks for your insight!

I sold my first Frankenzeiss but have already another G45 sitting on my shelf next to a Olymus 50mm Macro donor body again. This Oly glass suffers fungus, therefore no bad conscience

Aug 27, 2012 at 06:40 PM

jay tieger
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p.88 #2 · What is your most recent (alt) lens purchase?

Got an Olympus OM body that doesn't kind of work with a 50/1.8 Zuiko and this...for $10
This is the version made by Komine...well made...very smooth focusing...and accurate

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Full Frame, wide open (at 2.8 on 30D) Sharpened to 3 in DPP, no USM after conversion

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100% crop (usm 200/2/0)

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Am very impressed

Aug 27, 2012 at 06:58 PM

buggz2k
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p.88 #3 · What is your most recent (alt) lens purchase?

Yes please, I'd like to know more about this, sounds like a great idea to me.

sebboh wrote:
LightShow wrote:
+1
Did you replace the Rokkor mount with a LSM to M adapter?

Please tell me you took pictures....

it's not rangefinder coupled, i don't have the equipment for that (or a rangefinder to use/calibrate it on). i just used a cheap m-mount to NEX adapter for the actual mount.

no pictures of the process. it actually turned out to be non-destructive of both lenses (though the rokkor is now missing key parts) except that i put four new holes in the mount base of the rokkor. when i decide for sure to keep it in this form i'll photograph it's construction process.

Aug 27, 2012 at 07:00 PM

carstenw
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p.88 #4 · What is your most recent (alt) lens purchase?

sebboh wrote:
yup, that's a good summary. i never really had much trouble focusing with the on adapter focus ring, but was still always annoyed by it because it turned the wrong direction (the nikon/pentax direction)

Ah, I spotted a mistake here: this is correctly called "the right direction"

Aug 27, 2012 at 07:41 PM

briantho
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p.88 #5 · What is your most recent (alt) lens purchase?

carstenw wrote:
sebboh wrote:
yup, that's a good summary. i never really had much trouble focusing with the on adapter focus ring, but was still always annoyed by it because it turned the wrong direction (the nikon/pentax direction)

Ah, I spotted a mistake here: this is correctly called "the right direction"

Yeah, if you're from another dimension.

Aug 27, 2012 at 08:30 PM

sebboh
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p.88 #6 · What is your most recent (alt) lens purchase?

m-a-x wrote:
Great job sebboh! Very neat!
This is very interesting for me. I instantly have some questions...
Did you manufacture that ring yourself, that centers the lens at the front (the flat one with the two holes)?
How would you approach to transfer the aperture values? By measuring the light with a camera meter, or by holding the G45 aperture ring side by side to the Rokkor aperture ring and making the marks?
Thanks for your insight!

actually that ring (which has four not two holes) is what centers the optics on the original g 45. it just happens to fit perfectly within the front optical block of the rokkor (with the optics removed obviously). incidentally, if i remove that front optical block module, the front of the g 45 that contains filter rings and name plate fits in perfectly. unfortunately that piece is to long to get clamped in place by the rokkor name plate, so i will have to trim it down in both the front and the back in order to use it.

both the rokkor and the contax have aperture rings that travel a consistant distance between each stop. i'm going to calculate the angular distance each travels from f/2 to f/16 and try to arrange a lever system that will correctly multiply the angular distance traveled by the appropriate constant. this is actually how the original rokkor aperture control worked, so there are lots of pieces from it i can hopefully reuse.

carstenw wrote:
sebboh wrote:
yup, that's a good summary. i never really had much trouble focusing with the on adapter focus ring, but was still always annoyed by it because it turned the wrong direction (the nikon/pentax direction)

Ah, I spotted a mistake here: this is correctly called "the right direction"

Aug 27, 2012 at 08:44 PM

rico
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p.88 #7 · What is your most recent (alt) lens purchase?

sebboh wrote:
blasphemy! how could leica, zeiss, and minolta (canon and olympus too) all get this wrong? i think even nikon used to have it right on their rangefinders and just switched on their slrs to make people disinclined to switch away from their system.

Actually, Nikon retained the focus direction from RF to SLR, but the true source of confusion lies with CZ, who championed "wrong" way focus direction with their Contax RF (prewar and post). Nikon simply adopted the mount and direction after the war. By the rollout of Contarex, CZ had reversed the direction to that of Leica. Poor Nikon was making lenses for Contax RF and Leica LTM in the '50s - that must have been interesting.

Aug 27, 2012 at 09:35 PM

sebboh
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p.88 #8 · What is your most recent (alt) lens purchase?

rico wrote:
sebboh wrote:
blasphemy! how could leica, zeiss, and minolta (canon and olympus too) all get this wrong? i think even nikon used to have it right on their rangefinders and just switched on their slrs to make people disinclined to switch away from their system.

Actually, Nikon retained the focus direction from RF to SLR, but the true source of confusion lies with CZ, who championed "wrong" way focus direction with their Contax RF (prewar and post). Nikon simply adopted the mount and direction after the war. By the rollout of Contarex, CZ had reversed the direction to that of Leica. Poor Nikon was making lenses for Contax RF and Leica LTM in the '50s - that must have been interesting.

ah, i'd only used the nikon ltm rangefinder lenses.

Aug 27, 2012 at 09:47 PM

carstenw
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p.88 #9 · What is your most recent (alt) lens purchase?

sebboh wrote:
carstenw wrote:
Ah, I spotted a mistake here: this is correctly called "the right direction"

blasphemy! how could leica, zeiss, and minolta (canon and olympus too) all get this wrong? i think even nikon used to have it right on their rangefinders and just switched on their slrs to make people disinclined to switch away from their system.

I offer only one, overwhelmingly persuasive piece of evidence: Canon. Whichever way they use is obviously wrong, so Nikon *must* be right

Aug 27, 2012 at 09:48 PM

LightShow
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p.88 #10 · What is your most recent (alt) lens purchase?

I have a Fuji m42 lens that focuses "the wrong way".
I don't mind that they go the other way, as long as I don't bring a mixed set out with me, because that just slows things down due to confusion.

Aug 27, 2012 at 10:14 PM

jay tieger
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p.88 #11 · What is your most recent (alt) lens purchase?

LightShow wrote:
I have a Fuji m42 lens that focuses "the wrong way".
I don't mind that they go the other way, as long as I don't bring a mixed set out with me, because that just slows things down due to confusion.

Especially true for shooting action...when focusing has to be automatic...when it's one thing you don't have time to think about

...that's why for years I stuck with lenses that focused in the same direction as my Nikkors

...still, when I came across a 24/2.8 Oly that focuses "in reverse" I "caved" because the optical quality is much better than the 24 Nikkor I had....and because I'll be using it for static stills rather than for action shots

...then I found a very nice 28/2.8 vivitar/komine in an Oly mount (above) that focuses like the Oly...and so I've added another "oddball" to my kit...it's very well made...very smooth focusing...and accurate

Aug 28, 2012 at 01:03 AM

sebboh
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p.88 #12 · What is your most recent (alt) lens purchase?

my frankenzeiss got prettier!

Aug 30, 2012 at 02:55 PM

aleksanderpolo
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p.88 #13 · What is your most recent (alt) lens purchase?

^What is that??!! I must have missed it.

I got a Pentax "hollywood" recently by the way.

Aug 30, 2012 at 04:06 PM

sebboh
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p.88 #14 · What is your most recent (alt) lens purchase?

aleksanderpolo wrote:
^What is that??!! I must have missed it.

I got a Pentax "hollywood" recently by the way.

it is a contax g 45/2 in the helicoid/body of a rokkor 58/1.4. i posted the initial conversion on previous page, but now it has the proper zeiss nameplate added.

i've heard of the contax "hollywood" 28/2, but what is the pentax "hollywood"?

Aug 30, 2012 at 04:11 PM

aleksanderpolo
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p.88 #15 · What is your most recent (alt) lens purchase?

The K 28/2, resulted in a brief period of collaboration between Zeiss and Pentax before Zeiss went with Contax, also resulted in the K 15, and possibly the SMC/T* coating, see this article by Marco Cavina (in Italian):

http://www.marcocavina.com/articoli_fotografici/Pentax_28_2_M/00_pag.htm

Aug 30, 2012 at 04:17 PM

m-a-x
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p.88 #16 · What is your most recent (alt) lens purchase?

sebboh wrote:
my frankenzeiss got prettier!

Very much

Aug 30, 2012 at 06:53 PM

wfrank
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p.88 #17 · What is your most recent (alt) lens purchase?

Looking good! Like the shots of the deed too.

Aug 31, 2012 at 08:56 AM

carstenw
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p.88 #18 · What is your most recent (alt) lens purchase?

carstenw wrote:
Bifurcator wrote:
I don't have a contax bellows. Just tubes. It's nice on tubes up until about 4x magnification before is starts looking a little funky.

And sure, I can keep it for ya if you'd like NP. Whenever you're ready just link me to this page so I don't forget and raise my prices on ya.

Haha, okay. Well, I would say, don't hang on to it if you have any reason to sell, but I will certainly ask you about it when I get some money again. Oh, in what shape is it?

Bif, I am going to weasel out of this one. I found one locally for the same price you are offering, roughly, but saving me expensive shipping and import duties.

Aug 31, 2012 at 09:36 AM

jay tieger
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p.88 #19 · What is your most recent (alt) lens purchase?

I dare not say just how little I paid for this mint 135/2.5....(mint other than not being able to get the filter off...)

If I didn't already have two 135/2.8 Nikkors....

....somebody will be a happy winner of this puppy....

Sep 02, 2012 at 03:37 AM

jctriguy
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p.88 #20 · What is your most recent (alt) lens purchase?

jay tieger wrote:

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Sep 02, 2012 at 04:00 AM

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