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SMC Pentax-M 150mm F3.5 Review RSS Feed

SMC Pentax-M 150mm F3.5

Reviews Views Date of last review
18 89,082 Tue August 7, 2018
Recommended By Average Price Average User Rating
100% of reviewers $100.63 8.89
SMC Pentax-M 150mm F3.5

SMC Pentax-M 150mm F3.5
SMC Pentax-M 150mm F3.5

This lens is slightly faster than its K-series predecessor.

SMC Pentax-M 150mm F3.5
©, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (no A setting)
Automatic, 6 blades
5 elements, 5 groups
Mount Variant
Check camera compatibility
Max. Aperture
Min. Aperture
Min. Focus
180 cm
Max. Magnification
Filter Size
49 mm
Internal Focus
Field of View (Diag. / Horiz.)

APS-C: 11 ° / 9 °
Full frame: 16 ° / 14 °
Built-in, slide out
Dedicated hard case
Lens Cap
Plastic clip-on
Weather Sealing
Other Features
Diam x Length
63 x 75 mm
290 g
Production Years
1977 to 1986
Engraved Name
smc PENTAX-M 1:3.5 150mm
Product Code
User reviews
Manual FocusBuilt-in HoodAperture RingFull-Frame SupportDiscontinued
Price History:

Add Review of SMC Pentax-M 150mm F3.5
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-15 of 18
New Member

Registered: April, 2011
Location: Dorset , UK
Posts: 6
Review Date: August 7, 2018 Recommended | Price: $65.00 | Rating: 9 

Pros: size, sharpness, build quality and price
Cons: minimum focus distance
Sharpness: 8    Aberrations: 8    Bokeh: 8    Handling: 10    Value: 10    Camera Used: K-70   

This M 150mm lens is very nice to use and sharpness is excellent (I always use f5.6 or f8). Contrast is very low which can easily be adjusted in post processing and is generally of advantage rather than disadvantage !
Minimum focus distance is unfortunately not so good and my only small issue with this lens.
Also I`m required to use manual mode and the green button which slows things down but that is how all M lenses operate and I won`t count this against this little beauty
New Member

Registered: November, 2014
Posts: 3
Review Date: August 8, 2016 Recommended | Price: $50.00 | Rating: 9 

Pros: compact and sharp
Sharpness: 8    Aberrations: 8    Bokeh: 9    Handling: 9    Value: 10    Camera Used: pentax K-30   

A real pleasure to own and use. (perhaps I just love all Pentax SMC lenses).
A fine-weather sunny day medium telephoto. perhaps not quite long enough for wild-life close ups, but excellent for pulling out the part of the landscape that makes a nice photo.

For example, here with K-30 using the green button, ISO 200, F/8, 1/320s.
An interesting hillside in afternoon sunshine between 4 & 5 km away, cropped to about 1/2 of the frame
Resolution here suffers from slight heat-haze (zoom in on upper Pylon and notice the wavy lines).

Junior Member

Registered: January, 2013
Location: Texas
Posts: 32

1 user found this helpful
Review Date: August 6, 2016 Recommended | Price: $85.00 | Rating: 8 

Pros: Light, Well Build, Telescopic Hood, excellent at f/5.6
Cons: So-so sharpness at full aperture
Sharpness: 7    Aberrations: 9    Bokeh: 9    Handling: 10    Value: 9    Camera Used: Olympus E-M10-II   

Interesting focal length, I always felt that the 135mm was too short or too long.
Becomes a 300 mm on a Micro Four Third camera, sometimes enough for wildlife.
Excellent mechanically, like all M serie pentax lenses.
The sharpness, though, is not good enough (I am very demanding) to use at full aperture, but is already very good at f/4.5, and excellent at f/5.6. Very little difference between corners and center. Note that I tested it (very carefully, brick wall, magnifier for manual focus) with a Micro Four Third camera, the angle of field is therefore reduced, and I don't know what the corner would be on a full frame camera. Also, a MFT camera is more demanding at the center of the field (higher pixel density).
Forum Member

Registered: December, 2010
Location: Northern Germany
Posts: 73

1 user found this helpful
Review Date: June 10, 2016 Recommended | Price: $100.00 | Rating: 9 

Pros: sharpness, compact, quiet fast, filter size
Cons: MFD, P/- and Blue Fringing
Sharpness: 10    Aberrations: 8    Bokeh: 9    Handling: 10    Value: 10   

On of the sharpest of my Lenses. Think of a good Fifity Lens sharpness. I do not pixel peep the corners but on Crop Sensor there is no Problem anyways. You need to add very little shaprness in Post Processing and it's possible to crop a lot. Nice colors and bokeh too.

Under the right Conditions, mostly wide open, a very, very good Lens. I bet it's even better on K-1.

It is so compact and light, it is a perfect Tele on Crop for the Bag. Must be a nice Portrait Tele on FF.
Veteran Member

Registered: January, 2010
Posts: 1,665

2 users found this helpful
Review Date: March 13, 2016 Recommended | Price: $125.00 | Rating: 9 

Pros: Size, build construction
Cons: minimum FL
Sharpness: 9    Aberrations: 8    Bokeh: 9    Handling: 10    Value: 9    Camera Used: K-3   

One of many oddball FL in the Pentax back catalogue, but what a joy it is. Only marginally larger than the 135/3.5, but with 10% more reach. And it's appreciably smaller than the 200/4. I call it the stealth portrait lens. Good for open air events with many people in a large but confined space, like a BBQ or company party. Can easily grab an intimate portrait from 20' away.

Sharpness is very good, though this is not a macro lens. Honestly, I haven't pushed my copy through exhaustive sharpness or aberration tests, because that's not what this lens is about. It's plenty damned sharp to my eye for its purpose.

Bokeh is pleasant and transition is smooth. Wide open at this FL it is a nice lens to separate subject from background. However, it's only 6 bladed, so will produce noticeable hexagons from point sources.

If it has any drawback, it's the minimum focal length of 180cm. There are times when I want to get closer with this lens and it's just not happening, but that can be said for just about any telephoto lens.

In all honesty, the 150/3.5 is perhaps a bit redundant if you have a 135/3.5. Nonetheless, I have both and tend to grab the 150mm first.
New Member

Registered: April, 2015
Posts: 3
Review Date: April 24, 2015 Recommended | Price: $50.00 | Rating: 10 

Pros: Sharp, bokeh, color
Cons: minimum focusing distance
Sharpness: 10    Aberrations: 9    Bokeh: 10    Handling: 10    Value: 10    Camera Used: Pentax k5 II   

Bought this lens off ebay two weeks ago and all I can say is wow. Wide open this lens is amazing, the bokeh is just super smooth. Took it on its first job two days ago and no problems whatsoever. Focusing was silky smooth, aperture ring snappy and the elements were clean but the results were just superb. It made me contemplate, why would I spend hundreds to buy an automatic lens with more glass elements and more CA coating etc when I can spend 50 bucks and get old school lenses which can be used professionally once they are in great condition.

The Pentax M 135mm f3.5 is a must get and if you don't have one, you really don't know what you're missing out on. Manual lenses are a joy, and manual focus is something that shouldn't be seen as burden, besides focus confirmation is available (on my Pentax K5 ii) and once it confirms that it's in focus. trust me, it is.
Forum Member

Registered: January, 2014
Location: Bydgoszcz
Posts: 98
Review Date: April 6, 2015 Recommended | Price: $100.00 | Rating: 9 

Pros: Excellent sharpness, nice bokeh and colors.
Cons: Would be perfect with auto focus
Sharpness: 9    Aberrations: 9    Bokeh: 10    Handling: 10    Value: 9    Camera Used: Pentax k-3   

Amazing lens, very recommended for every portrait photographers.
Site Supporter

Registered: January, 2009
Location: Champagne Ardennes, France
Posts: 19
Review Date: April 25, 2012 Recommended | Price: $80.00 | Rating: 9 

Pros: Compact, well built, IQ
Cons: manual settings
Sharpness: 9    Aberrations: 8    Bokeh: 8    Handling: 10    Value: 9    Camera Used: K100D   

This nice compact lens (like most M lenses) is relatively rare. Focal length seems strange, but is very close to 135mm in terms of fieldwiew.
A classical M lense with good handling, smooth focusing. IQ and sharpness fit Pentax Standards : you'll never be disapointed with pictures produced by this M150.

Senior Member

Registered: February, 2011
Posts: 118
Review Date: October 17, 2011 Recommended | Price: $180.00 | Rating: 10 

Pros: sharpness, bokeh, contrasty
Cons: rare focal length
Sharpness: 10    Aberrations: 9    Bokeh: 10    Handling: 10    Value: 10   

This is a sleeper lens.

I found a pretty good copy a year ago, very few marks on the barrel, excellent optics, built-in metal hood has minimal use marks.
Very nice sharpness for this focal length, even wide open.

It reminded me of M100 2.8, very similar portrait lenses.
Both are very compact for their respective focal lengths.
f2.8 and f3.5 aren't that far apart if taken into consideration of the added focal length.

Since I acquired it, I've replaced my entry level long zooms with this lens. Its build quality, excellent IQ, and relative small size makes that decision so much easier.
Senior Member

Registered: September, 2009
Location: Beautiful Bavaria :-)
Posts: 123

2 users found this helpful
Review Date: July 27, 2011 Recommended | Price: $65.00 | Rating: 8 

Pros: sharpness, compactness, build quality
Cons: rare, overpriced, competition from 4/75-150 & 3.5/135

This lens has a fundamental problem (which would make my rating 7.5 instead of 8):

the less expensive and easier to find SMC-M 4/75-150 zoom is as sharp and contrasty, just a tad heavier and longer, has the same 49mm filter and is more versatile. Both have six aperture blades, similar bokeh qualities and a built-in light hood.

Most of this is also true for the ubiquitous SMC-M 3.5/135.

So, why having this lens?

1. the "unusual" focal length allows different views
2. the fine build quality and superb optics deliver good picture quality and make it a joy to use
3. out of the SMC-M line this is one of the more collectibles, because it seems to be rare
New Member

Registered: September, 2010
Location: TAIWAN
Posts: 11
Review Date: February 18, 2011 Recommended | Price: $100.00 | Rating: 10 

Pros: It's a superise!!make a astonishment

I can't remenber how to get it, But, When I saw the Photo.....

It was a Pleasantly surprised

Registered: August, 2009
Location: Wandering the Streets
Posts: 1,411
Review Date: November 25, 2010 Recommended | Price: $150.00 | Rating: 9 

Pros: Very nice color, lightweight, great focal length on digital
Cons: Haven't found a negative yet

Since I picked this up a few months ago it has become the 3rd lens in my travel trio. I like it because it is very light and yet gives me a 225mm viewpoint on my little DL2. Although it is a manual focus lens this hasn'[t been a big deal because I typically use it for landscapes or scenery so I have time to meter and focus.

Image quality is quite good on digital and the bokeh is pretty decent as well. Because the lens hood is built in I do not have to worry about losing it. Finally, since I use the 77 Limited, the M 40 and this one on trips I can get away with only one polarizer, a 49mm.

Let's see. Light weight, good image, nice bokeh, built in lens shade, and 49mm filter thread. Yep, that's why I like it.

Oh, I did think the focal length was a bit odd when I originally picked it up but I don't even notice it any more
New Member

Registered: April, 2010
Posts: 4
Review Date: October 6, 2010 Recommended | Price: $80.00 | Rating: 8 

Pros: Light, build quality and built in hood
Cons: Speed, contrast and CA while wide open

I wanted some long reaching lens and the guy that sold me the 35/2.0 also had this interesting lens - I paid aprox 80USD per each.
For 150mm it is very compact, built in hood is nice and it uses 49mm filters.

With open aperture it lacks some contrast and it is very prone for some nasty CA - at 3.5 I usually try not to shoot very contrasty subjects or my photo will be "washed out" and with a lot of CA.
At 5.6 and above it is becoming very sharp.

Bokeh at 3.5-5.6 is very smooth and nice despite having only 6 aperture blades.
Junior Member

Registered: March, 2010
Location: East Yorkshire
Posts: 47

1 user found this helpful
Review Date: March 30, 2010 Recommended | Price: $100.00 | Rating: 9 

Pros: Size, sharp
Cons: relatively slow (3.5)

Surprisingly very nice results. Quite unusual focal length but in APS-C it is close to 200 mm (actually it is 225 mm). Small and light, there is always a place in the bag, just in case. I prefer a DA70 and this than the heavy 50-135 for trips.
Some Purple fringing in 3.5, easily corrected in Photoshop.

Registered: March, 2008
Location: Quebec city, Canada
Posts: 9,356

1 user found this helpful
Review Date: July 1, 2009 Recommended | Rating: 8 

Pros: Small! sharp, well built
Sharpness: 9    Aberrations: 9    Bokeh: 8    Handling: 9    Value: 8   

This lens is a cutie! Much smaller than I would have expected, smaller than my 135 mm f2,8... It's extremely well built, like every M lens. The focusing ring is butter-smooth, and has an enormous throw. It has a built-in hood which is very useful in many situations (go figure why the previous owner used a rubber hood with it...)

The aperture ring is, again, as nice as other M lenses, positive locks and smooth operation.

The lens is sharp wide open, with only minimal improvements visible as you close down the aperture. Contrast is also surprisingly nice. Bokeh more than ok but this is not a macro lens.

Some people complain about the focal length, but I personally find it very confortable. There's almost no difference between 135 and 150 mm, really.

I got it because it was so cheap, and might not end up using it a lot. Then again, using MF lenses from time to time is a good thing...
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