Another Minolta MD (New-MD, MD III) 100mm F2.5 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.

MD_100_2_5_DSC00517.jpg

Minolta New-MD 100mm 1:2.5 main parameters:

minolta.eazypix.de index 152
Name engraved on lens MD
f[mm] 100
A max [1/f] 2,5
A min[1/f] 22
Lens design [el.] 5
Lens design [gr.] 5
Filter thread Ø front(rear)[mm] 49
Lens Shade built-in
closefocus[m/ft] 1/3.5
Dimension Ø x length [mm] 64×65.5
Weight[g] 310
Year 1981
Style MD III
Code No. (ROKKOR-X) or Order No. 598-100

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 – Mako Reizei 冷泉 麻子

Mako Reizei – Mako is a second year student from Ooarai Girls High School. She’s also the driver of the Anglerfish Team and drives a Panzerkampfwagen IV. Saori (N-MD 135mm F2.8) said she has hypotension [low blood pressure levels], which Mako often uses as an excuse for being late to school or falling asleep during class. According to Sodoko’s record. She was late for class 251 times, absent for 12 times and authorized absent for 5 times.


Resolution – close distance:

Test description: target is a 10×15 cm picture (printed, glossy photo paper), fixed on the wall by scotch. Distance – about 10% longer than minimal focus distance marked on the lens. Camera Sony A7II (24mpx, full frame) was fixed on the tripod and managed remotely with computer display as a viewfinder. All groups of shots were repeated 9 times for every target position on all apertures from fully opened up to F16, ISO-100, WB – same for all shots. 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.

test_scene_view300x200

Main idea – to exclude the field curvature affect on so close distance.

Of course, I can’t be absolutely accurate, but so many repeats of shots – 4 for corners, 2 for long side, 2 for short side are giving me insurance that test results are correct.

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:

_MD_100_2_5_F_preview2

Test results (selected version, easy to compare – 4 positions):

100_2_5_closedist_SHORT.jpg

Test results (full version – all 9 positions):

100_2_5_closedist_FULL.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:

_MD_100_2_5_F_longdist_scene2

Test results:

100_2_5_LONGDIST.jpg


Vignetting:

(frames scaled – 300×200)


Geometric distortion:

(frame scaled 1200×800)


Coma aberrations:

(100% crops – 300×200)


Chromatic aberrations:

(100% crops – 300×200)


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)


Long distance bokeh:

Test conditions: lens was focused on half distance on the scale (1.7m), houses were fixed in infinity distance on the ground.

(frame scaled 1200×800)


Light dots bokeh:

Test conditions: lens was focused on to minimal distance + 10% of scale (about 1.1m), diodes were  fixed in 3m distance at the dark background.

(frame scaled 1200×800)


One example (I’ll add more later):

MD10025_example_03078.jpg


Another resources with tests:

phillipreeve.net


My overall conclusion about the Minolta N-MD 100mm 1:2.5F (Minolta MD III 100mm F/2.5):

I can not be objective, because this lens is my favorite – my second number in any trips (after 50mm normal). It’s a bomb, surprise, gem, etc. I use it for portraits a lot, but not only. Need a great shot? Just point and shoot a camera with this lens. On any aperture. Wide opened this is absolutely sharp. It has nice fire resistance and build-in hood for hard light conditions. And one of the best bokeh I have ever seen with a really little aberrations, that is strange for such beautiful bokeh. Small-sized  and lightweight for this focal distance. Works great with auto-focus adapters like Techart-Pro. I think it is most underrated Minolta lens ever.

 

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