Which prime lens?

ManualFocus-G · Expire: 2014-11-24

BTW no-one has mentioned the Domiplan yet Laughing

Rolf · Expire: 2015-12-26

You will find very often at *bay the remark TOMIOKA.

It seems that the seller there are copying this without any know-how from one auction to the other if it is a fast 1.2/50mm or 55mm lens.

hinnerker · Expire: 2015-08-09

Hallo Rolf,

thats true.. most of the commercial seller don't know exactly the background story from Tomioka/Yashinon/Kyocera.
That is a "mysterical" with this lens.

As you can read in my footer, i did own 6 or 7 Yashinon DS-M Lenses,
24/35/2x50... All these Lenses where probably build by Tomioka, because Tomioka was a japanese Manufacturer and supplier for Yashica. Later on
Yashica did a company-takeover and Tomioka was going to be a part of Yashica Inc.

Thats the reason why it is so difficult to answer your question Tomioka or not. Most of the Tomioka formulas where later build by Cosina, as well as the most of the Porst labeled lenses.
I think, the Tomioka design was not longer patent protected and so it was possible for Cosina to support Porst with the 1.2 MC lens.

But i dont know this .. its just a speculation..

Hinnerker

ezechiel · Posted: Tue Sep 08, 2009 7:18 am Post subject:

Hi again,

just received the porst and the takumar 55mm (this one is in M42).
I compared the Porst to the Pentax-A 50mm 1.7. I didn't tried the 55mm too much because the M42 adapter stayed almost stuck in the camera Shocked

Then I found out that it is not like "stick the key back in and turn to unlock". I have to push that little metal piece really har inwards the ring to unblock the system (is that the piece for allowing infinity AF?). Anyway..

Different color rendering between Porst and Pentax-A, the pentax seems to have more 'living' colors. But the Porst sticks maybe more to reality. But the Porst is sharper at 1.2 than the Pentax-A at 1.7. Max aperture quality medal goes to the Porst for me.

The Pentax-A is also softer. For some pictures, I prefer the Pentax-A rendering. But I really like the bokeh of the Porst! Almost psychedelic:

This picture was taken in my garden. Just for testing, but any comment and critics are welcom on this 'test' picture Smile

One problem.. There are some dust particles in the lens.. It doesn't seem to change anything to the picture, but that's food for fungus.. I never opened a lens. Will google a bit to find how to do it. But, should I do it?

Didn't received the S-m-c takumar 50mm 1.4 yet. So can't compare for now. But the Porst is a lens I will keep!! Maybe I should get rid of the 55mm Super Takumar?

hinnerker · Expire: 2015-08-09

hinnerker · Expire: 2015-08-09

Ok, here are three images how to disassemble the 1.2/55mm Porst.

Now you are also able to clean Stuck Aperture..

On the rear element you can also work if you have to do so..

Greetz
Hinnerker

ezechiel · Posted: Tue Sep 08, 2009 9:56 am Post subject:

Danke Schön!!

I will clean it as soon as I will have some time! This lens seems really easy to dissasemble! No work at all compared to zoom lenses Laughing

For the inner part, cleaning with a soft brush is enough I guess.
But would it do some harm to the coating if I cleaned it with the non-brush part of a lenspen for example?

hinnerker · Expire: 2015-08-09

ezechiel · Posted: Sat Oct 03, 2009 12:04 pm Post subject:

Hi,

all cleaned up now. For the rear element, I had to open the lens completely, but now I'm haing little trouble to put it back in one piece.

if I understood well, I focus(turn) to infinite, put the two pieces together so that diafragm controller is in the right place (this just for finding the right position)

then turn the focus ring the other way and once the lens block is as far as possible, turn the other way again to assemble the two pieces (screw thread that is inside the focus ring).

Or is there another way?

Thanks in advance.

ezechiel · Posted: Sat Oct 03, 2009 3:01 pm Post subject:

Got it fixed Smile

Before starting to reassemble, put the aperture ring on minimum aperture (f22) and position the aperture slider on the lens part accordingly.

Be careful to remind the position of the lens part accordingly to the part with aperture ring (sorry for my english ^^). For example, in my case, the number 2 of 'f' position 1.2 was exactly aligned with the L of the word COLOR on the front of the lens.

Remove the lens part from bottom part.

Next, I screwed the focus ring totally on the bottom part (with the aperture ring) and then screwed back until it is in a 'normal' position. Because when you screw it on totally, you can't go till infinite. So unscrew it a bit till there is no problem to turn the focus ring from 0.5 to infinite.

Then unscrew the focus ring for about 2 and a half rotations (is this clear??). Then put in place the lens part in the focus ring. But don't screw it in too far. Let it take place just at the beginning of the screw thread.

Then, try to align the two symbols you picked earlier. I just needed to turn the focus ring a bit clockwise (if facing to the front of the lens). Be carefull that the lens part is still in the focus ring screw thread (at the beginning).

Next thing to do is hold the bottom part and the lens part steady and turn the focus ring clockwise. After a bit of turning, you'll maybe feel some resistance. Screw a little back and try again. This means that the aperture slider on the lens part is not completely aligned with the bottom part.

If you want to see if it is in its place, just turn the aperture ring. If the blades don't move, you've missed and you have to re-align the aperture slider on the lens.

If you succeeded, just continue to turn the focus ring clockwise. The aperture slider (and other alignment parts) are now in place so the lens element cannot turn anymore.

Now put the ring with distance scales in the right position and put back in place the three little screws.

you're done!

DSG · Joined: 04 Mar 2007 Posts: 544 Location: London, UK.

ezechiel · Posted: Sat Oct 03, 2009 8:06 pm Post subject:

Hi there,

thanks for the feedback. I got the 55mm super takumar but a bit dissapointed. I prefer the s-m-c takumar 50mm. I did not test it a lot though.

The porst is a nice lens and quite sharp (have to improve my manual focussing though). But I should give it a deep cleaning, because I just cleaned it and noticed there is like a white haze between the two front elements. Maybe I'll do this later because it's only noticeable under a certain angle and strong light. But no dust anymore Smile

The pentax A 50mm 1.7? I love this lens! Not a pancake but very small and great colors. I should leave it a bit aside and get back to the porst.

My 18-50 WR kit lens? . . . . . . I don't use it any more except when I need wide angle. Maybe I should sell it but I think one day, the WR will come in handy in a rainy day..

About converting lenses. I'd love to, but this means buying other lenses to use the mount (and thus $$$, so not right now :p ). Or is it possible to find just the mount of a lens??

DSG · Joined: 04 Mar 2007 Posts: 544 Location: London, UK.