Minolta MD 28mm 1:2.8 – 7 elements 7 groups – review

Published by Tony on

Minolta MD 28mm 1:2.8 7×7 – vintage manual lens test and review

  • Official classification: New-MD
  • Collector’s classification: MD III

Minolta has produced two MD 28mm F2.8 lenses in the similar MD III design – one with 7 elements in 7 groups optical scheme and another – 5 elements in 5 groups. Both have enough identical exterior but may be easily distinguished because 5×5-version has a thin black ring around the front lens but 7×7-version doesn’t have. Both sisters have been compared by sharpness/resolution, the link is at the bottom of the page. But this article is about the test results of the 7×7-version.

Minolta MD 28mm 1:2.8 7x7 + X700

Minolta MD 28mm 1:2.8 7×7 (MD III, New-MD) specifications

minolta.eazypix.de index51
Name engraved on lensMD
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 Shadeclip-in
closefocus[m/ft]0.3/1
Dimension Ø x length [mm]64×43
Weight[g]185
Year1981
StyleMD III
Code No. (ROKKOR-X) or Order No.590-810
Floating elementsNO (full support by autofocused adapters)
Aperture blades number6
Confidence in the test results of reviewed copiesVery high
Reviewed lens SN:8072626

Minolta MD 28mm 1:2.8 7×7 exterior

Mounted on Minolta X-700

This is a very suitable set – the camera and lens have the same design (released 1981)

Minolta MD 28mm 1:2.8 7×7 lens-shade

Minolta MD 28mm 1:2.0 sharpness

Сlose-distance resolution test

Testing methods description

  • Target: 10-15 cm picture, printed on glossy photo paper
  • Distance:10% longer than minimal focus distance marked on the lens
  • Camera: Sony A7II (24mpx, full-frame, tripod, remote control). M-mode, ISO fixed, WB fixed, SteadyShot – OFF.
  • The test was repeated for every F-stop on every focus position with manual focus adjustment for each shot. That is to avoid the effect of field curvature.
  • RAW processing: Capture One, default settings. All quality settings – 100%. Crops – 300×200 px

Scene preview

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

Test results (full version – all 9 positions):

Long-distance resolution test

Testing methods description

  • Target: cityscape
  • Distance: > 200 meters to center focus point
  • Camera: Sony A7II (24mpx, full-frame, tripod, remote control). M-mode, ISO fixed, WB fixed, SteadyShot – OFF. The focus point is on the center only.
  • RAW processing: Capture One, default settings. All quality settings – 100%. Crops – 300×200 px

Scene preview

Test results:

Minolta MD 28mm 1:2.8 7×7 aberrations

Vignetting

Geometric distortion:

Coma aberrations:

Chromatic aberrations:

Short-distance bokeh

Test conditions: lens was focused on minimal distance 0.25m, plants are in 2m distance from the camera

Long-distance bokeh

Test conditions: the lens was focused on half distance on the scale (0.5m), buildings are on “infinity”-distance

Light bubbles bokeh

Test conditions: lens was focused on minimal distance + 10% of scale (about 0.27m), diodes were fixed in 2m distance

Other resources with tests:

Minolta MD 28mm 1:2.8 7 elements 7 groups (or Minolta MD 28mm F/2.8 7×7, New-MD, MD III design) – overall conclusion

To my regret, I can’t say that this lens is a Minolta’s honor. It’s just an average wide lens with no big advantages. Corners can’t become a sharp even on F8… On the other hand – it’s really cheap, lightweight, well built. Anyway, it is better than most of the analogs on the market, even from first-line companies. So, it can be kept ‘just in case’ if 28mm isn’t the main angle, but can be used sometimes.


1 Comment

DJ · 2018-02-14 at 23:31

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.

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