Chiyoko Super Rokkor 1:2.8 f=5cm C (Minolta) lens review.

After getting a new lens, I always take a few technical shots to understand its strengths and weaknesses – usually it helps me a lot to start using unknown lens with much less of doubt. One day I decided that my data might be interesting for someone else and this site has been made.

MSR5028_exterior_34

Chiyoko Super Rokkor 5cm 1:2.8 (Minolta) parameters:

Name engraved on lens CHIYOKO SUPER ROKKOR
f[mm] 50
A max [1/f] 2.8
A min[1/f] 22
Lens design [el.] 5
Lens design [gr.] 3
Filter thread Ø front(rear)[mm] 40.5
Mount LTM (aka LSM, m39 etc.)
closefocus[m/ft] 1/3.3
Dimension Ø x length [mm] 47×37
Weight[g] 175
Year 1954
Aperture blades 9

Additional information:

  • This lens was introduced in 1954 (with s/n ‘1 500 001’ ) with new Minolta 35 Model II camera and has two editions
  • Biggest known s/n is about ‘1 603 xxx’ but there was a gap between ‘1 511 xxx’ and ‘1 600 001’. So the total number of produced lenses is about 16 000 copies (not over 100k as it can be imagined). This lens is rare. (source – collection-appareils.fr)
  • It is the cheapest 50mm lens in Chiyoda Kogaku/Chiyoko LTM line
  • On the right side of the field depth scale there will be a red dot, indicating the focus mark with the infrared film. (source – collection-appareils.fr)
  • Reviewed copy s/n1511817 has a defects, which can slightly affect the performance in corners, but I hope it doesn’t happen. But I can’t check it… But anyway I must say it.
  • Reviewed Copy has a amount of air bubbles in the center of the front lens – don’t worry about it, it’s OK for old optics and allowed by the old standards of production.

Lens exterior:

(Please, forgive me the dust on the lens, I never have the patience to clean objects for close-up photo sessions)


Lens code name – Kurumi Tokisaki 時崎 狂三:

Kurumi Tokisaki (時崎 狂三(ときさき くるみ), Tokisaki Kurumii?) is the third Spirit to appear. Due to her brutal actions, she is referred to as the Worst Spirit (最悪の精霊, Saiaku no Seirei?). She is also the first Spirit to appear as an antagonist in the Date A Live series.


Sharpness – close distance:

Test description: target is a 10×15 cm picture (printed, glossy photo paper), fixed on the wall by scotch. Distance – 1.7m. Camera Sony A7II (24mpx, full frame) was fixed on the tripod and managed remotely with computer display as a viewfinder. Apertures from fully opened up to F16, ISO-100, WB – the same for every shot. SteadyShot – OFF. Focus was manually corrected for each shot. After all needed shots have been taken for one target position – I moved the target to the next place. Main idea – to exclude the field curvature affect on so close distance.

Of course, I can’t be absolutely accurate, but results looks good enough.

Finally, pictures were converted from ARW-files in Capture One with default settings (Some single files have a slight light correction, for better visual convenience in comparison), then cropped for 300×200 px elements, combined into diagrams and exported into JPEG-files.

Scene preview:

MSR5028_b_res_close_preview.jpg

Original target image (printed in horizontal orientation on 10cm X 15cm glossy photo paper)

Kurumi_Tokisaki_2Print.png

Test results:

MSR5028_c_res_close.jpg


Resolution – long distance:

Test description: Camera Sony A7II (24mpx, full frame) was fixed on the tripod and managed remotely with computer display as a viewfinder. Targets (buildings) were fixed by gravity power on the distances in more than 200 meters. All shots have been taken with apertures from fully opened up to F16. ISO-100. Shutter Speed – depends on light (camera A-mode), WB – fixed and the same for all shots. SteadyShot – OFF. Focus was manually corrected for each shot to exclude focus-shift affect.

Finally, pictures were converted from ARW-files in Capture One with default settings (Some single files have a slight light correction, for better visual convenience in comparison), then were cropped for 300×200 px elements, combined into diagrams and exported into JPEG-files.

Scene preview:

MSR5028_e_far_preview.jpg

Test results:

MSR5028_e_res_far.jpg


Vignetting:

(frames scaled – 300×200)

MSR5028_f_vignetting.jpg


Geometric distortion:

(frame scaled 1200×800)

MSR5028_F2_8_geometry083.jpg


Coma aberrations:

(100% crops – 300×200)

MSR5028_h_coma_aberr_.jpg


Chromatic aberrations:

(100% crops – 300×200)

MSR5028_i_chrome_aberr_.jpg


Close distance bokeh:

Test conditions: lens was focused on to minimal distance (1m), plants were fixed in 3m distance from camera in front of the window with bright light from outside.

(frame scaled 1200×800, bokeh covers the frame partially)

MSR5028_j_bokeh_close_.jpg


Long distance bokeh:

Test#1:

conditions: lens was focused on half distance on the scale – about 2m, houses were fixed in infinity distance on the ground.

(frame scaled 1200×800)

MSR5028_k_bokeh_farMID.jpg

Test#2:

Test conditions: lens was focused on minimal distance on the scale (1m), houses were fixed in infinity distance on the ground. Such scenes can’t be meet often, so this is demonstration of extreme conditions. In most cases of real life photography the blur level will be less, like on previous Test #1.

(frame scaled 1200×800)

MSR5028_k_bokeh_farMIN.jpg


Light dots long distance bokeh:

Test conditions: lens was focused on to minimal distance 1m, lights were fixed in more than 200m.

Such scenes can’t be meet often, so this is demonstration of extreme conditions. In most cases of real life photography the blur level will be less.

(frame scaled 1200×800)

MSR5028_m_dots_far.jpg


Other resources with reviews:


My overall conclusion about the Chiyoko 50MM F2.8 Super Rokkor, Chiyoda Kogaku, Minolta:

MSR5028Avatar.png

This is the cheapest, smallest and lightest Super Rokkor 50mm lens. So, it wasn’t surprise that it has low IQ in terms of  sharpness and aberrations. But these aberrations allow this lens to draw beautiful pictures. On the other hand it is slow enough. I can recommend it for real photography in two cases, the first: if old-school or historical -like view is needed – this would be one of the best choice. The second: photographer likes experiments. So, this is the lens with very special character, but not for everyday using from the modern point of view.

This is the first lens which was brought directly for review. I’m not going to use it during real photo-sessions and knew about it earlier. After the tests have been done I just realized that my expectations were right. But this lens contains a historical meaning, so I’m going to keep it.


 

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