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Asahi Pentax 150mm 4/0 (M42 mount)
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PostPosted: Fri Jun 24, 2022 4:49 pm    Post subject: Asahi Pentax 150mm 4/0 (M42 mount) Reply with quote

Let me start by saying that I am not very familiar with Pentax lenses and the various naming conventions, so excuse my mistakes in that regard.

I am looking at a Pentax 150mm 4.0 in M42 mount. The front ring says: "Asahi Opt. Co. Japan Super-Multi-Coated Takumar" which according to information I have found means it is the third version of this lens, and the last one in M42 mount.

https://lens-db.com/asahi-super-multi-coated-takumar-150mm-f4-1971/

Lens-db describes it as "Mod. M42". Will it work with a standard M42 adapter? The Novoflex adapter I use has a small ledge on the inside that keeps the aperture pin on the lens depressed, although it looks like this lens has a manual/auto switch so that shouldn't be a problem either way. What exactly is the modification to the M42 mount on this lens?

Regards, C.


PostPosted: Fri Jun 24, 2022 5:51 pm    Post subject: Reply with quote

Here we have:

1. Super-Takumar 1:4 / 150 -- M42, model I has 5/4 optics, 43740 stamped on Auto/Man switch. Early model I have glued rear dust cover; later model I have threaded rear dust covers.

2. Super-Takumar 1:4 / 150 -- M42, model II has 5/5 optics, 43741 stamped on Auto/Man switch.

3. Super-Multi-Coated TAKUMAR 1:4 / 150 -- M42, 5/5 optics, 43742 stamped on Auto/Man switch.

4. SMC PENTAX 1:4 / 150 -- K-mount, 5/5 optics

The "Mod. M42" probably refers to the addition of the mechanical aperture-position linkage for communicating with Spotmatic ES and F cameras which provide full-aperture metering capability when these lenses are used. The linkage does not prevent usage with other M42 cameras or adapters.


PostPosted: Fri Jun 24, 2022 6:40 pm    Post subject: Reply with quote

Very good lens (the 5/5 config) with almost no CA. Made this image with the PK mount version:
https://www.flickr.com/gp/55691955@N05/3Sv53s


PostPosted: Fri Jun 24, 2022 8:38 pm    Post subject: Reply with quote

visualopsins wrote:

The "Mod. M42" probably refers to the addition of the mechanical aperture-position linkage for communicating with Spotmatic ES and F cameras which provide full-aperture metering capability when these lenses are used. The linkage does not prevent usage with other M42 cameras or adapters.


Thank you for explaining that Smile

caspert79 wrote:

Very good lens (the 5/5 config) with almost no CA. Made this image with the PK mount version:
https://www.flickr.com/gp/55691955@N05/3Sv53s


Nice picture!

Regards, C.


PostPosted: Sat Jun 25, 2022 9:27 am    Post subject: Reply with quote

I have the older Super-Takumar version.
It is a great lens
Tom

#1


PostPosted: Sat Jun 25, 2022 1:48 pm    Post subject: Reply with quote

visualopsins wrote:
Here we have:

1. Super-Takumar 1:4 / 150 -- M42, model I has 5/4 optics, 43740 stamped on Auto/Man switch. Early model I have glued rear dust cover; later model I have threaded rear dust covers.

2. Super-Takumar 1:4 / 150 -- M42, model II has 5/5 optics, 43741 stamped on Auto/Man switch.

3. Super-Multi-Coated TAKUMAR 1:4 / 150 -- M42, 5/5 optics, 43742 stamped on Auto/Man switch.

4. SMC PENTAX 1:4 / 150 -- K-mount, 5/5 optics

The "Mod. M42" probably refers to the addition of the mechanical aperture-position linkage for communicating with Spotmatic ES and F cameras which provide full-aperture metering capability when these lenses are used. The linkage does not prevent usage with other M42 cameras or adapters.


according to Gerjan's book they are both 5/5. Version 2 has different optics in the two rear elements.


PostPosted: Sat Jun 25, 2022 3:11 pm    Post subject: Reply with quote

D1N0 wrote:
visualopsins wrote:
Here we have:

1. Super-Takumar 1:4 / 150 -- M42, model I has 5/4 optics, 43740 stamped on Auto/Man switch. Early model I have glued rear dust cover; later model I have threaded rear dust covers.

2. Super-Takumar 1:4 / 150 -- M42, model II has 5/5 optics, 43741 stamped on Auto/Man switch.

3. Super-Multi-Coated TAKUMAR 1:4 / 150 -- M42, 5/5 optics, 43742 stamped on Auto/Man switch.

4. SMC PENTAX 1:4 / 150 -- K-mount, 5/5 optics

The "Mod. M42" probably refers to the addition of the mechanical aperture-position linkage for communicating with Spotmatic ES and F cameras which provide full-aperture metering capability when these lenses are used. The linkage does not prevent usage with other M42 cameras or adapters.


according to Gerjan's book they are both 5/5. Version 2 has different optics in the two rear elements.


Embarassed That's what I get for using the first edition of his book instead of the second edition. The first edition does show the correct 5/5 diagram, but typo in specifications list. Thanks for catching!


PostPosted: Thu Jun 30, 2022 3:00 pm    Post subject: Reply with quote

My Asahi Super-Multi-Coated Takumar 150mm f/4.0 arrived today. So far I have only taken some of my usua; test pictures but my first impression is "WOW". This lens and I are going to be good friends Smile

Regards, C.


PostPosted: Sat Jul 02, 2022 5:05 pm    Post subject: Reply with quote

Put it on today:

Yes so I am lying here. what of it? by The lens profile, on Flickr

Duck in the middlekeh by The lens profile, on Flickr