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SMC Pentax 100mm F4 Macro Review RSS Feed

SMC Pentax 100mm F4 Macro

Reviews Views Date of last review
8 62,710 Wed December 18, 2019
Recommended By Average Price Average User Rating
100% of reviewers $126.43 9.38
SMC Pentax 100mm F4 Macro

SMC Pentax 100mm F4 Macro
SMC Pentax 100mm F4 Macro

This macro lens has a faster A-series counterpart.

SMC Pentax 100mm F4 Macro
©, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (no A setting)
Automatic, 6 blades
5 elements, 3 groups
Mount Variant
Check camera compatibility
Max. Aperture
Min. Aperture
Min. Focus
45 cm
Max. Magnification
Filter Size
52 mm
Internal Focus
Field of View (Diag. / Horiz.)

APS-C: 16 ° / 14 °
Full frame: 24 ° / 20 °
Not needed
Dedicated hard case
Lens Cap
Plastic clip-on
Weather Sealing
Other Features
Diam x Length
65 x 82 mm
370 g
Production Years
1975 to 1977
Engraved Name
User reviews
Manual FocusAperture RingFull-Frame SupportDiscontinued
Price History:

Add Review of SMC Pentax 100mm F4 Macro
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-8 of 8

Registered: November, 2017
Location: Garden City, NY
Posts: 6,135
Lens Review Date: December 18, 2019 I can recommend this lens: Yes | Price: N/A | Rating: 9 

Pros: Built, Handling, Sharp, Everything
Cons: F4
Sharpness: 9    Aberrations: 8    Bokeh: 9    Handling: 10    Value: 10    Camera Used: K-50   

Great piece of K-series glass. Superb handling, great for Macro and short tele.

Built is amazing!

Photos speak louder than words:

Site Supporter

Registered: April, 2015
Posts: 2,756

3 users found this helpful
Lens Review Date: December 1, 2018 I can recommend this lens: Yes | Price: $220.00 | Rating: 10 

Pros: Zeiss Heliar Design: Dream Bokeh, sharp, sharper
Cons: none
Sharpness: 10    Aberrations: 10    Bokeh: 10    Handling: 10    Value: 10    Camera Used: K3, K5IIs, K30   

This is one of the most remarkeable macrolenses next to the very early preset Takumar 50/4 1:1 macro.

This lens is a Zeiss Heliar Design, more complicated and even better than the Tessar Design of the K50/4 macro lens which I wrote about as well.

I got this lens in pristine as new condition together with the K50macro. The built quality is of course as much up to limited level as the K50 macro.

But what you get is this amazing bokeh, colours to die for and sharpness right wide open combined with zero purple fringing or CA's and no coma wide open.

This lens is stiff competition to all 85mm (or 70/77) portrait-lenses if 100mm is alright for you.
New Member

Registered: November, 2013
Posts: 12
Lens Review Date: November 11, 2018 I can recommend this lens: Yes | Price: $110.00 | Rating: 10 

Pros: excellent macro lens
Cons: very very small CA's
Sharpness: 10    Aberrations: 9    Bokeh: 10    Handling: 10    Value: 10    Camera Used: k-s1, k-x k200d   

same optics as the bellow lens 4/100

I've got both. tis lens used with an achromatic focal reductor and macro ring and you'll get sharpest pictures 2,8/70 ever seen at a very low price . try it
New Member

Registered: August, 2015
Location: Czech Republic
Posts: 24
Lens Review Date: September 3, 2017 I can recommend this lens: Yes | Price: $100.00 | Rating: 10 

Pros: Sharp, Great Contrast, Beautiful Colors, Smooth Bokeh
Cons: nothing
Sharpness: 10    Aberrations: 9    Bokeh: 10    Handling: 10    Value: 10    Camera Used: Pentax K-5II   

What a lens especially with the 50mm extension tube. WOW!!


Registered: December, 2007
Location: In the most populated state... state of denial
Posts: 1,525
Lens Review Date: January 16, 2014 I can recommend this lens: Yes | Price: $100.00 | Rating: 9 

Pros: Sharpness - Compatibility - Value
Cons: Hard to find - Heavy
Sharpness: 9    Aberrations: 10    Bokeh: 10    Handling: 10    Value: 10    Camera Used: KX, K-X, K-5iis, K-3iii   

I got my example with slight fungal infection
After cleaning the lens it has performed great.
Nice all around sharpness and contrast and can be used in the whole range.
It is also a very good portrait lens

PD 2022 - The k3-iii gives full support for this lens now, and the results in AV mode are great, it acts like a longer tele in DSLRs and still produces stunning results
Site Supporter

Registered: March, 2008
Location: North Carolina
Posts: 1,187
Lens Review Date: November 7, 2009 I can recommend this lens: Yes | Price: $80.00 | Rating: 9 

Pros: Very Sharp, Contrast, Price
Cons: All Manual, No built in lens hood, Not F2.8

This is a very good lens for macro shots. While it is only a 1:2 macro, it is sufficiently sharp enough to do significant cropping, if necessary, without loss of detail. Pics are sharp across the frame, and the bokeh is great (check out the link). I have not had a problem shooting hand held in bright sunlight. If you are looking for macro on a budget, this and I imagine the Pentax-M version would be a good place to look. Jumping from a F4.0 macro lens to F2.8 lens is a large jump in price, making this lens a real bargain.

I am giving this a 9 because of the combination of excellent build quality, glass and price. Here is a link to some pics taken with this lens.
Site Supporter

Registered: October, 2008
Location: Vancouver, Canada
Posts: 7,663
Lens Review Date: August 15, 2009 I can recommend this lens: Yes | Price: $175.00 | Rating: 9 

Pros: Sharpness, build, longer film-to-subject distance.
Cons: Slow f4.0, size with hood & 50mm extension tube.
Camera Used: K Series film bodies (K1000, KM, KX, K2, K2DMD)   

The K100/4 Macro released in 1975 is on the rare side and only lasted three years in production. It was replaced with the smaller M series version in 1977.

The K100/4 Macro has .5x magnification, but by adding the Pentax 50mm auto extension tube you can achieve 1.0x. You will also retain the lenses automatic diaphragm, using this extension tube.

The K100/4 Macro is very sharp and has a minimum aperture of f32, so you have numerous DOF options. However it is slow at f4.0, so low light conditions will require the use of a tripod and macro focus rail. With this focal length you have more distance to subject range than with the 50mm macro, so it is better for insects.

You should also get the 52mm diameter clip-on lens hood, shared with the K85/1.8, K100/4 Bellows and the K105/2.8. Adding the hood & extension tube creates a long lens making it harder to hand hold, especially when shooting wind blown flowers.

Overall the K100/4 is a very good macro lens; however for traveling I usually take the K50/4 as itís much lighter and easier to use hand held. I use the K100/4 around town mostly with a tripod or at home on my copy stand.

Sample shots taken with the K100/4 Macro & 50mm Auto Extension Tube. Photos are medium resolution scans from original slides.

Camera: K2 Film: Fuji Velvia 100 ISO: 100

Camera: K2 Film: Fuji Provia 400 ISO: 400

Site Supporter

Registered: April, 2007
Location: North Palm Beach, Florida
Posts: 728
Lens Review Date: November 26, 2008 I can recommend this lens: Yes | Price: $100.00 | Rating: 9 

Pros: Nice as macro, wonderful colors and great contrast
Cons: Kinda long on a DSLR, critical focus at infinity very short
Sharpness: 9    Aberrations: 8    Bokeh: 8    Handling: 9    Value: 9   

A fairly rare bird, this SMC "K" series 100mm macro does it job well. It takes excellent macro shots, but with the advantage you don't have to have your subject pressed up against the front optic to get your shot.

The "K" series seems to be the missing link between the heavier Takumar "tanks" and the lighter more compact M series. They are heavier than an what you expect from an M series, but they don't have that "cut from a solid piece of steel" weight of the Takumars. Action on the focus is very nice, lots of play when dealing with macro focusing. I noted, however, when the lens is used as a normal tele the focus near infinity is very touchy and it's easy to be a hair out of critical focus. At f4, you will be using this lens towards the wide open side as well, but the images even at f4 are sharp and usable.

The lens stops down to f32, which is wonderful on long tripod exposures... you can get much more of your macros shots into focus that way.

If you want to hunt down live bugs for macro shots, this lens is excellent for that use, as well as occasional regular lens use. If you find a bargain on one, buy it!
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