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Sears Auto 50mm F2.0

Reviews Views Date of last review
4 9,214 Sun November 15, 2020
Recommended By Average Price Average User Rating
100% of reviewers $12.65 8.75
Sears Auto 50mm F2.0

Sears Auto 50mm F2.0 Sears Auto 50mm F2.0

Auto Sears 50mm 2.0

Focus: Infinity to 2ft
Aperture: F2.0 to F16

52mm filter thread

6 blade diaphragm
Mount Type: Pentax K
Price History:

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Loyal Site Supporter

Registered: March, 2011
Posts: 1,123

1 user found this helpful
Lens Review Date: November 15, 2020 I can recommend this lens: Yes | Price: $10.30 | Rating: 8 

Pros: speed, sharpness, contrast, value
Cons: .6m MFD in later lenses
Sharpness: 8    Aberrations: 7    Bokeh: 7    Handling: 7    Value: 9    Camera Used: Pentax K-5iis, Sony A7ii   

If you've never tried a fast 50, these lenses are an excellent place to start:
Good optics and even better value since they're often available on eb*y for under $30.

These Auto Sears 50s were kit lenses for a series of K mount Sears SLRs sold from the late 1970s through the late 1980s (the autofocus version was a more expensive option and was also sold separately). The cameras and lenses were both rebadged Ricohs. Along with the f/2 lenses, f/1.7 and f/1.4 50s were also available - but on higher end bodies.

The K mount Sears f/2 came in several iterations. If you get a properly functioning lens, you won't go wrong no matter which version you get. They're all good!

That said, since I've owned a few copies, I've assembled a For The Record recap of what I've learned about them. As far as I know...

There are (at least) seven iterations. I believe each one has a 6 element, 5 group optical layout, but I know nothing about potential optical changes through the years.
None of them are claimed to be multi coated. Early versions have metal barrels and a .45 m minimum focus distance. Later versions are plastic with a .6 m MFD. All versions have metal mounts, a 6 blade iris and no aperture half stops.

1) Metal body, rubber focus grip. Has .45 m minimum focus distance, weighs 208 grams. It has a white serial number and is the same lens as the Ricoh XR Rikenon.

2) Metal, but lighter. Rubber focus grip, .45 m MFD, 194 g, white serial. Same lens as XR Rikenon?

3) Plastic body and grip, .6 m MFD, 168 g, black serial. Same lens as XR Rikenon L.

4) Same (?) as #3, but with autofocus. AF works, albeit slowly. MFD for AF is .9 m. Manual focus (.6 m MFD) is possible, but cumbersome. May not mount on cameras with flash overhang. Same lens as AF Rikenon.

5) Plastic, smaller, .6 m MFD, 138 g, black serial. Same lens as XR Rikenon S.

6) Plastic, even smaller, .6 m MFD, 132 g, black serial. Same lens as "Rikenon" (no initials).

7) Plastic, "Sears" blacked out on name ring, .6 m MFD, 128 g, black serial. Same lens as Rikenon?

Another view of the different bodies:

Loyal Site Supporter

Registered: February, 2014
Location: Pennsylvania
Posts: 1,438
Lens Review Date: April 25, 2019 I can recommend this lens: Yes | Price: $15.00 | Rating: 9 

Pros: Light weight, sharp, great bokeh, cheap
Cons: Mostly plastic
Sharpness: 9    Aberrations: 9    Bokeh: 10    Handling: 9    Value: 10    Camera Used: Pentax K-30   

My first SLR was a Sears KSX which came with this lens. I used it for a long time until selling the camera to a friend decades ago. I regretted getting rid of that 50mm. Recently, a nearly new condition copy of the Sears/Ricoh 50mm F2 came into my possession for $15 as part of a KS Super camera bundle. All the positive aspects I remembered about the lens hold true for this one too.

Focusing is quick and smooth, thought the two foot minimum focus distance is a tad long if you are accustomed to Pentax prime lenses. For a single coated lens design, contrast, color and ghosting are very well controlled. A lens hood is a necessity in strong side light unless a loss of contrast is beneficial to your photo.

Sharpness is quite good in the center wide open and becomes excellent by f5.6. The edges are quite soft until f5.6 becoming very good at f8. I much prefer the bokeh produced by this lens to that of my Pentax FA 50mm F1.4. Creamy, dreamy smooth! Makes a dandy short portrait lens.
New Member

Registered: November, 2016
Posts: 7
Lens Review Date: November 10, 2017 I can recommend this lens: Yes | Price: None indicated | Rating: 10 

Pros: Everything
Cons: straight blade aperture
Sharpness: 9    Aberrations: 9    Bokeh: 7    Handling: 8    Value: 10    Camera Used: Sony NEX-5N   

The Auto Sears 50mm F2 lens is the same lens as the Ricoh P Rikenon 50mm F2.

Pro's : Sharp (even wide open)
Compact lens
Extremely affordable (as of now)
Color Saturation is very good
Low to no distortion

Con's (nit picking): Plastic construction (metal mount)
Single Coated (its still good enough)
Aperture blades are straight so stopped down bokeh with have hexagons.
Forum Member

Registered: March, 2007
Location: TN
Posts: 58
Lens Review Date: June 9, 2016 I can recommend this lens: Yes | Price: None indicated | Rating: 8 

Pros: fast
Sharpness: 8   

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