Another Minolta New MD 28mm F2.8 7×7 lens review

Minolta produced two MD 28mm F2.8 lenses – one with 7 elements in 7 groups optical design and another – 5×5. Both looks very similar, but can be easy recognized – 5×5 version has thin black ring around front lens for and 7×7 doesn’t. Both lenses are comparised on this site from the sharpness point of view, but this article is about testing results from 7×7 version.

MD_28_2_8_7x7_DSC00527.jpg

Minolta New-MD (MD III) 28mm 1:2.8 (7 lenses in 7 groups) parameters:

minolta.eazypix.de index 51
Name engraved on lens MD
f[mm] 28
A max [1/f] 2,8
A min[1/f] 22
Lens design [el.] 7
Lens design [gr.] 7
Filter thread Ø front(rear)[mm] 49
Lens Shade clip-in
closefocus[m/ft] 0.3/1
Dimension Ø x length [mm] 64×43
Weight[g] 185
Year 1981
Style MD III
Code No. (ROKKOR-X) or Order No. 590-810

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 – Anzu Kadotani 角谷 杏

Anzu Kadotani – is a third year student from Ooarai Girls High School. She is the president of her school’s student council. She re-founded Oarai’s Sensha-dō Club and became the commander, radio operator and later gunner of Turtle Team which operates a German Panzer 38(t), later turned into a Hetzer during the battle against Kuromorimine Girls High School.


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_28_2_8_7_7_F_preview2

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

28_2_8_7x7_close_dist_test_SHORT.jpg

Test results (full version – all 9 positions):

28_2_8_7x7_close_dist_test_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_28_2_8_7x7_F_longdist_scene2

Test results:

28_2_8_7x7_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 (0.25m), plants were fixed in 2m 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 (0.5m), 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 0.27m), diodes were  fixed in 2m distance at the dark background.

(frame scaled 1200×800)


Another resources with tests:


My overall conclusion about the Minolta N-MD 28mm 1:2.8F (7 lenses in 7 groups) (Minolta MD III 28mm F/2.8 (7 lenses in 7 groups)):

To my regret, I can’t say that this lens is a Minolta’s honor. It’s just a simple wide lens with no big advantages. Corners can’t became a sharp even on F8… On the other hand – it’s really cheap, lightweight, well build and can be saved ‘just in case’. It works fine with auto-focus adapters like Techart-Pro, and still convenient enough if you prefer manual focusing.


This lens took part in the battle:

MD28mmAll_Battle__Avatar

MD28mmAll_Battle_Round2_Avatar.png

One thought on “Review: Minolta MD 28mm 1:2.8 (7 lenses in 7 groups)

  1. Excellent review! I like how you take the time to review each lens of the plain MD generation. Anyway, gotta agree with you about this lens, it didn’t impress me too much either. Glad to see I’m not alone in my conclusion.

    Liked by 1 person

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