Mamiya Sekor 55mm f/1.8 Auto

Mamiya-Sekor 55mm 1.8 Auto-1

Mamiya Sekor 55mm f/1.8 Auto. If you’re looking to purchase this lens I always check Adorama and Ebay for good deals. It helps me if you purchase it through one of these links here in this review. When you purchase through these links it financially enables me to devote time to develop this site further. Thanks for the help! -Todd

Mamiya-Sekor 55mm 1.8 Auto-2


7.2 oz (205g)

Focus Type
Manual Focus.

Focus Ring

Close Focus
1.75 feet (0.5 meters).

Filter Threads
52mm, Metal.

Aperture Ring

6 blades stopping down to f/16.

Mine came in M42 Metal.

Made in

f/1.8 | f/2 | f/2.8 | f/3.5 | f/4 | f/8


100% Crop

f/1.8 | f/2 | f/2.8 | f/3.5 | f/4 | f/8


Corner at f/1.8

Corner at f/1.8

f/1.8 Nicely sharp for wide open with a little softness, a little chromatic aberration and really good contrast.
f/2 Sharpens up really well with great contrast and a little chromatic aberration left over.
f/2.8: Very sharp with fantastic contrast and no chromatic aberration.
f/3.5: Sharper yet.
f/4: Sharper yet.
f/8: the beginning of a little diffraction.


There is a fair bit of vignetting at f/1.8 and quickly clears around f/2.8 and gone by f/3.5.


The blur is decent and and only a little distracting.


100% Crop



Amazingly straight with very little visible Barrel Distortion.

On MF Camera
Optics:          ★ ★ ★ ★
Mechanics:   ★ ★ ★ ★
Ergonomics:  ★ ★ ★
Usefulness:    ★ ★ ★
Availability:    ★ ★
Overall:          ★ ★ ★

On AF Camera
Ergonomics:   ★ ★
Overall:           ★ ★ ★
Out of 5

Want a fantastic 55mm lens and don’t mind manual focus then this lens is a bargain. For wide open the lens is really sharp with only chromatic aberration causing some image loss, but stopped down to f/2 the lens is fantastic!


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My hopes are to take the time to continue developing this website with more test photo based reviews. If you are ever interested in purchasing this lens or other photography equipment please do so through these links here in this review. I always check Adorama and Ebay for good deals. This helps support my family and allows me to take more time for the site. The best part is this site is free for you and I link good deals I find!

Sometimes these links will actually give you better deals then typical retail prices! I personally buy from the links I have listed whether looking for new gear or fun old stuff. I can personally attest to their good & safe service from years of experience. Thanks again to you, our readers, for supporting us! -Todd