Review: Minolta MC Tele Rokkor PF 100mm 1:2.5

Minolta MC Tele Rokkor-PF 100mm 1:2.5 lens review. (‘MC II’ style by collectors classification)

Here is another one tele-lens by Minolta. Very suitable for portraits because it is ‘100mm fast’ – the focal distance is not too short, but the lens still convenient in operation. Also, it is ready for landscapes from F5.6 and totally sharp over the frame if closed to 8 – it makes this lens enough universal. Can be interesting for photographers who are looking for a mix of good IQ and classic rendering.

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 an 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.

Minolta_Rokkor_MCC10025_049_exterior_logo.jpg

Minolta MC Tele Rokkor PF 100mm 1:2.5 parameters:

minolta.eazypix.de index 147
Name engraved on lens MC TELE ROKKOR-PF
f[mm] 100
A max [1/f] 2.5
A min[1/f] 22
Lens design [el.] 6
Lens design [gr.] 5
Filter thread Ø front(rear)[mm] 55
Lens Shade screw-in
closefocus[m/ft] 1.2/4
Dimension Ø x length [mm] 65×68
Weight[g] 410
Year 1970
Style MC II
Code No. (ROKKOR-X) or Order No. 646
Notes

Floating elements NO (full support by autofocused adapters)
Number of aperture blades 6
Average price 2019: USD70-120
Reviewed Lens SN: 1508352

This optical design 6/5 has been changed in later MC age (so, rubberized MC can have  two different schemes depends on production date), and one more time again in New-MD era. So, without deep research, it can be said that IQ of this reviewed Rokkor is probably close to any 100/2.5 Steel&Glass Minolta ‘MC’ (but not ‘Auto’) and for some earlier rubberized MC, and probably far from any MD lenses.

Note: The first Minolta lens with 100mm focal distance for SLR SR-mount was the Auto Tele Rokkor PF 100mm 1:2.0 (still is not tested on lensQAworks, it is hard to catch it for a normal price because it is popular among collectors) but in 1968 Minolta dropped that scheme and started the newer 100/2.5 (MC-I). The reviewed copy is the second updated version with new shape of focusing ring was in production from 1970 till 1976. It was a period of changes and experiments, and better to keep in mind that lenses from that era can show a different behavior independently of the fact that they can have the same schemes, sizes, etc.


Lens exterior:

It looks typical for a lens with ‘Curled’ or ‘Hills&Valleys’ hulls – both descriptions are for the shape of the focusing ring. By the popular collectors classification, every Minolta lens with such focus ring is MC-II. (but not every MC-II lenses have a steel&glass construction: Minolta MC Rokkor-PF 55mm 1:1.9 has a rubber coating of the focusing ring, but also included into MC-II line)

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

Accessories:

On Minolta SR-T 101 camera:


Lens code name – Asada Shino:

Asada Shino (朝田 詩乃, Asada Shino?), known as Sinon (シノン, Shinon?) in «Gun Gale Online» (GGO), ALfheim Online (ALO), as well as «Project Alicization», where she had temporarily used the Solus (ソルス, Sorusu?) account, is the deuteragonist of the Phantom Bullet Arc and one of the main characters in the War of the Underworld sub-arc of the Alicization Arc. She is a skilled Virtual Reality game player, who began playing Gun Gale Online based on the suggestion from her friend, Shinkawa Kyouji, in an attempt to overcome her trauma concerning guns. After the events of the Phantom Bullet Arc, she began playing «ALfheim Online» as a Cait Sith archer, capable of hitting targets two hundred meters away with a bow that should only be able to shoot arrows accurately at a maximum distance of one hundred meters.


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. All groups of shots were repeated 3 times for every target position on all apertures from fully opened up to F16, ISO-200, 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. Main idea – to exclude the field curvature affect on so close distance. Of course, I can’t be absolutely accurate, but test results looks 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

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

Shino Asada 5_2print.jpg

Scene preview:

MCC10025__b_res_close_previewNEW.jpg

Test results:

MCC10025__c_res_close.jpg


Sharpness – 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-50. 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:

MCC10025__e_far_preview.jpg

Test results:

MCC10025__e_res_far.jpg


Vignetting:

(frames scaled – 300×200)

MCC10025__f_vignettingNEW.png


Geometric distortion:

(frame scaled 1200×800)

MCC10025_geometry_79.jpg


Coma aberrations:

(100% crops – 300×200)

MCC10025__h_coma_aberr_.jpg


Chromatic aberrations:

(100% crops – 300×200)

MCC10025__i_chrome_aberrNEW_.png


Long distance bokeh:

Test#1:

Test conditions: lens was focused on minimal distance 1.2m, houses were fixed in infinity distance on the ground.

Such scenes can’t be meet often, so this is a demonstration of extreme conditions. In most cases of real-life photography, the blur level will be less, see the next Test#2.

(frame scaled 1200×800)

MCC10025__k_bokeh_far_min_1_2_NEW.png

Test#2:

Test conditions: lens was focused on 2.5m – ‘portrait distance’, houses were fixed in infinity distance on the ground.

(frame scaled 1200×800)

MCC10025__k_bokeh_far_mid_2_5_NEW.png


Light dots long distance bokeh:

Test #1

Test conditions: lens was focused on to minimal distance 0.45m, lights were fixed in more than 200m.

Such scenes can’t be meet often, so this is a demonstration of extreme conditions. In most cases of real-life photography the blur level will be less – see Test #2.

(frame scaled 1200×800)

MCC10025__m_dots_far_min_1_2m_NEW.png

Test #2

Test conditions: lens was focused on 2m – ‘portrait distance’, houses were fixed in infinity distance on the ground.

(frame scaled 1200×800)

MCC10025__m_dots_far_mid_2_5m_NEW.png


Other resources with reviews:

  • phillipreeve.net – previous MC-I incarnation is reviewed. Has a 50% chance to show close the same IQ

My overall conclusion about the Minolta MC Rokkor PF 100mm F/2.5:

MCC10025__Avatar.png

After all the tests: this Rokkor isn’t a killer in resolution terms if wide opened, but displays total sharpness over the frame at F8 at least. This is a very good result for optics from that era and makes the lens interesting for modern photographers: well balanced – great for portraits and ready for landscapes, street or something like. Other tested aberrations are quite typical for tele-lenses – it has noticeable chromatic, vignetting is presented too, but nothing special, and on the other hand – little coma and good geometry.

Traditionally for ‘curly’ designed lenses this MC Rokkors MC 100/2.5 is quite heavy but well built in demand for today ‘steel&glass nostalgia’ style, it can be easy reassembled for maintenance/CLA and has a chance to be in the same condition next thousand years (‘Master, save us from elements separation…’).

As a result, we see the fast lens with a combination of popular focal distance, good enough sharpness, nice rendering, and solid feeling in the hands. Sum of all of these traits means that it is a popular aim for photographers and auctions listings confirm it too, but I can’t say that lens is overpriced (instead of younger MD-III incarnation – the price of which is crazy growing last a few months). So, after the all, finally, yes – Rokkor MC 100mm F2.5 can be recommended without doubts for any styles of photography – it is absolutely ready for creating masterpieces in your hands.


This lens took part in battles:

Battle__Avatar.png

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