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Pentax 135mm f2.5

Pentax 135mm f2.5

PENTAX · Prime Lens

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Synthesized from 15 reviewer sources · Analysis as of Sep 30, 2026 (today)

What do reviewers say about the Pentax 135mm f2.5?

As of September 2026, among the 15 reviews we compiled, optical performance drew the most discussion: 83 claims from 7 of them, which we read as 51% positive, 7% neutral, 42% negative.

Synthesized from 15 reviewer sources for Pentax 135mm f2.5. Optical performance draws the most discussion: 42 positive, 6 neutral, and 35 negative across 83 sentiment markers. The most criticism lands on bokeh: 64% positive, 7% neutral, 29% negative across 28 claims.

What are the Pentax 135mm f2.5 specifications?

Focal Length Mm135 mm
Max Aperturef/2.5

specs: designation

What do reviewers praise and criticize?

Optical Performance
42 pos · 6 neu · 35 neg
“it to the minolta 2.8 celtic also wide open so let's take a look and see the difference so the celtics a little bit larger lens um as you can see it's pretty sharp too um even though it's shot at two eight compared to three five i think it's pretty close in sharpness but you can see the contrast” — Cheap Shots Lens Reviews and Photography
Build Quality
5 pos · 1 neu · 2 neg
“really nice all metal construction that these are always built really nicely uh very smooth focal U Rings here and everything or Focus rings and here we go let's see put it on the lens here and this one is isn't the a like this one uh is a px a you see that uh if it has an a” — leehaze1
Mount Compatibility
2 pos · 8 neu · 4 neg
“and then it helps you focus in on what you're doing by not exposing all the numbers, but just giving you that window now this lens uses the Pentax K mount...so we're going to use the Pentak K to NEX adapter...” — AdaptedAlpha
Price & Value
3 pos · 3 neu · 2 neg
“now today on price check we're going to take a quick look at some pentax takumar lenses and what they're selling for on ebay here we have the takumar 135 millimeter f 2.5 and 42 lens rather nice 135 so pushing the portrait telephoto end of the lens that you might use nice prime lens fast…” — HaYoo YouTube Creator
Weight & Portability
5 pos · 1 neu · 0 neg
“clocking in at 444 grams this telephoto lens is actually still not that heavy by today's standards optically it's not as sharp as modern 135 millimeter lenses but you'd be hard to tell the difference the image quality is superb you get pictures that are perfectly exposed and focused…” — Cee Ristopher

More detail — 9 additional axes
Vignetting
0 pos · 0 neu · 1 neg
“the five and six reveals more apparent chromatic aberration on the Five Element when zoomed in now stopping down a bit reduces the amount of chromatic aberration on both lenses and it F 5.6 the problem is almost completely eliminated both lenses have equal vignetting performance at f2.5 but the…” — Mark Holtze
Chromatic Aberration
1 pos · 0 neu · 3 neg
“it up to f 8 on the right and what you're going to first see is just kind of testing this lens out big difference between the amount of aberration chromatic aberration uh wide open in three five compared to uh f8 so the lens is still a pretty good lens some aberration again you could see it in the” — Cheap Shots Lens Reviews and Photography
Coma
2 pos · 1 neu · 2 neg
Bokeh
18 pos · 2 neu · 8 neg
“see here in this photo where I've added some vignette to the edges in the right conditions the bokeh can be quite fascinating sometimes wild not just wide open but also stop down this is one of the reasons why the lens is so much fun to use the photo here was taken stop right down and the lens…” — Simon's utak
Color Rendition
13 pos · 1 neu · 2 neg
“of the files if you're nearly your exposure you've you're onto a winner with the image quality on this thing because it's absolutely fantastic so you might be wondering why I'm saying this lens is almost perfect after the things that I've talked about there you know it's got great color rendition…” — Lee Iveson
Filter Thread
0 pos · 1 neu · 0 neg
Dimensions
0 pos · 3 neu · 0 neg
Handling
2 pos · 1 neu · 1 neg
AF Noise
0 pos · 1 neu · 1 neg

Which reviews is this based on? (15)

Every claim above traces to these original reviews. We don't write opinions — we synthesize theirs.

📹 Pro Reviews (15)

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More on the Pentax 135mm f2.5: Where reviewers split · Specs, answered
Reviewer takes: bokeh · build · color rendition · generation context · mount compat · optical performance · price