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Mamiya SEKOR MACRO MF 120mm F/4 for 645
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PostPosted: Sat Nov 05, 2022 7:50 pm    Post subject: Mamiya SEKOR MACRO MF 120mm F/4 for 645 Reply with quote
Phase One 645DF+ P25 back

f 4.0 1/125 s; ISO 200



There is the full size image:

https://i.ibb.co/mrnVbLQ/CF016362.jpg


PostPosted: Sat Nov 05, 2022 7:55 pm    Post subject: Reply with quote
Phase One 645DF+ P25 back

f 4.0 1/90 s; ISO 200




There is the full size image:

https://i.ibb.co/qWmm4qJ/CF016367.jpg

Last edited by LittleAlex on Sat Nov 05, 2022 8:03 pm; edited 1 time in total


PostPosted: Sat Nov 05, 2022 7:59 pm    Post subject: Reply with quote
Phase One 645DF+ P25 back

f 4.0 1/90 s; ISO 200





There is the full size image:

https://i.ibb.co/FWVVpBH/CF016372.jpg


PostPosted: Wed Nov 09, 2022 8:28 pm    Post subject: Reply with quote
Very nice indeed.


PostPosted: Wed Nov 09, 2022 9:10 pm    Post subject: Reply with quote
jamaeolus wrote:
Very nice indeed.




Yes, I had been hesitating for obtaining the lens, because I already own Mamiya Macro 80mm f/4 N, which is nice enough for the macro job. But reading the different reviews and comparisons of both, I started to consider the possibility to add it to my collection. And after the local seller gave to me the discount in $75, I had not been able to withstand the temptation.

And it is really nice also for the general work. Not only for the macro job. It has perfect contrast, and really is sharp from the full opening. Which Macro 80mm f/4 doesn't do so well.

As, for example, how 80mm works on f/4.0:

https://i.ibb.co/nRKtfbC/CF015801.jpg


PostPosted: Thu Nov 10, 2022 6:06 am    Post subject: Reply with quote
Like 1 Like 1 Like 1


PostPosted: Thu Nov 10, 2022 8:23 am    Post subject: Reply with quote
I've had the Mamiya 120/4 macro, which is quite a perfect macro lens, albeit a bit large together with a Mamiya 645 to Sony adapter. Recently received the 80/4 macro as well from Buyee.Jp, but unfortunately it suffers from terrible haze.

For full frame cameras I'd also recommend the Minolta AF 100/2.8 macro; I use mine on a manual M(af) to Sony adapter. It’s probably not APO-ish like the Mamiya 120/4, but still really good, sharp at all distances and wide open as well, has no distortion, and is great as a portrait lens as well.


PostPosted: Thu Nov 10, 2022 9:00 am    Post subject: Reply with quote
The 80 basically has a double gauss design with the groups at the outside. Probably separation in a group when it is hazy. The design of the 120mm is much different.

80


120


Personally I would like to get the 110mm 1:2.8 for shots like these but it is another ballpark cost wise. Even if offered at a low starting price auctions always escalate to several hundreds of Euro's


PostPosted: Thu Nov 10, 2022 9:52 am    Post subject: Reply with quote
D1N0 wrote:
The design of the 120mm is much different.


Oh well – there is really sixteen surfaces of the “glass-air”! And it steel delivers the astonishing contrast!

D1N0 wrote:
Personally I would like to get the 110mm 1:2.8 for shots like these


I already own MC Vega-28 120mm f/2.8 lens, which I use on my 645 system with the proper adapter. Anyway on the AF bodies you have to close the diaphragm manually with any kind of the manual lenses.

And t is not at all so bad :

http://forum.mflenses.com/mc-vega-28-f2-8-120mm-and-phase-one-645df-p25-back-t83393,highlight,%2Bvega+%2B28.html

http://forum.mflenses.com/vega-28b-mc-f2-8-120mm-and-phase-one-645dfand-p25-back-t84096,highlight,%2Bvega+%2B28.html


PostPosted: Thu Nov 10, 2022 10:28 am    Post subject: Reply with quote
That is a lot more compact than my Kaleinar 150/2.8 that won't stop down at all.


PostPosted: Thu Nov 10, 2022 11:07 am    Post subject: Reply with quote
D1N0 wrote:
That is a lot more compact than my Kaleinar 150/2.8 .


By the way, I compared once Kaleinar-3B 2.8/150 with the native system 645 lens Mamiya-Sekor C 150/3.5. And my conclusion was rather in favor to the 150/3.5.

http://forum.mflenses.com/kaleinar-3b-2-8-150-vs-mamiya-sekor-c-150-3-5-t83680,highlight,%2Bkaleinar.html


PostPosted: Thu Nov 10, 2022 11:18 am    Post subject: Reply with quote
Kaleinar isn't very sharp wide open. Can't say anything about stopping down. It has nice bokeh though. I have the Mamiya-Sekor C 150mm 1:4. A much better lens as well, more comparable to the Takumar 150/4. Will probably get the 3.5 as well if one pops up, but I am slowing down my purchases.(Still 5 on the way though :p).


PostPosted: Fri Nov 11, 2022 12:44 am    Post subject: Reply with quote
D1N0 wrote:
I am slowing down my purchases.


I hope I also fished with that Laugh 1


PostPosted: Fri Dec 16, 2022 8:38 pm    Post subject: Reply with quote
The lens in macro mode:

f/16.0 10,0 s; ISO 50



There is the full size image:

https://i.ibb.co/cxQz1kx/CF016529-min.jpg


PostPosted: Sat Dec 17, 2022 4:14 pm    Post subject: Reply with quote
One of the many images I made with the Mamiya Sekor A 4/120mm at the Domschatzmuseum Chur (Switzerland):



Now some 100% crops (original image taken at f8 or f11; due to diffraction f16 results in reduced overall resolution). Direct out of photoshop RAW conversion (sharpening at 25, radius 1 px). No additional sharpening:






Finally another 100% crop, this time with additional sharpening in Photoshop (80 sharpening at 0.5px radius) - it's almost too much already ...


Sure enough, a side-by-side comparision between the 50 MP images from the Fuji GFX and the 43 MP images of the Sony A7RII didn't show much differences in resolution (Fuji GFX with Mamiya Sekor A 4/120mm and Sony A7RII with Minolta AF 2.8/100mm Macro). The Minolta had a bit more lateral CAs, but that was easy correct in PP.

S


PostPosted: Sat Dec 17, 2022 4:36 pm    Post subject: Reply with quote
Great results 👍


PostPosted: Sat Dec 17, 2022 6:37 pm    Post subject: Reply with quote
caspert79 wrote:
Great results 👍


Look at those ... again Sekor A 4/120mm at the Fuji GFX. Again an exhibit from the Domschatzmuseum Chur, this time a fairly flat one -
to show the excellent performance of the Mamiya Macro. First the original image, resized to 900x1200 px. It's a detail from a chasuble (18th century, as far as I remember):



Now the 100% crops.
Image taken at f5.6 - results in best center contrast and fairly good corners (at f4 the corners are slightly soft).
RAW data converted with photoshop. No CA correction applied. Sharpening 40, radius 1 px.
First from the center:



Now the lower right corner. Again - no CA correction applied! The lens has no lateral CAs at all, at least on 50 MP sensors ...


Upper left corner. The slight drop of resolution in the upper left corner of this crop is not caused by lens problems -
but by the chasuble itself which is not completely flat at its upper end. You can see also a tiny amount of LoCAs / purple fringing:


The Mamiya Sekor A 4/120mm certainly is among the very best vintage MF lenses I own (out of nearly 900 lenses).

S


PostPosted: Sat Dec 17, 2022 7:42 pm    Post subject: Reply with quote
These were seriously expensive lenses new, and it shows.


PostPosted: Sat Dec 17, 2022 9:12 pm    Post subject: Reply with quote
Here, for comparison, the same Mamiya Sekor A 4/120mm lens used on the 43 MP Sony A7RII. This is also a 100% crop from the image center. RAW data were converted using the same parameters as with the Fuji GFX (eg sharpening 40, radius 1 px).

The difference is negligeable.



S


PostPosted: Sat Dec 17, 2022 9:54 pm    Post subject: Reply with quote
When taking images of golden and/or silver objects it is of critical importance that the lens is free from longitudinal chromatic aberrations (LoCAs). It basically means the lens must be apochromatic. Again, the Mamiya Sekor A 4/120mm has no problems at all. Image taken wih 43 MP FF Sony A7RII (and resized to 800x1200 px).



And here's the 100% crop from the image above:


The whole photography session - which lasted for several days - must have been an insanely expensive thing. Usually there were - apart from myself, the photographer - another 4-7 persons present: One or two security guys, one supervisor from the museum, two restorers (for handling the items - I wasn't allowed to touch the stuff), and at times two people from national TV ...

But it certainly was fun Wink

S


PostPosted: Mon Dec 19, 2022 12:01 am    Post subject: Reply with quote
Definitely on my acquisition list!


PostPosted: Tue Feb 28, 2023 7:01 pm    Post subject: Reply with quote
Snagged one at auction for less than 300 all in.



PostPosted: Tue Feb 28, 2023 8:55 pm    Post subject: Reply with quote
jamaeolus wrote:
Snagged one at auction for less than 300 all in.



My congratulations!


Happy Cat
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