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02-16-2019, 08:26 AM - 1 Like   #1
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SMC Pentax 85mm f/1.8 vs Tokina AT-X 90mm f/2.5

How does the SMC Pentax 'K' 85mm f/1.8 hold up against the Tokina AT-X 90mm f/2.5, which is generally regarded as one of the best manual focus lenses one can get? I decided to do a quick test on my Sony A7.

I equally like both lenses, but I'm planning to buy a Sony 85mm f/1.8 (I take a lot of pictures of my son, but because he moves so much I find 75% of the pictures to be out of focus with a manual lens). So I was going to sell one of the two lenses, and did a quick test to make sure I would not regret my decision.

See for original link:

First impression: hard to draw any conclusions. Bokeh is nice from both lenses.
Let's have a look at the 100% crops:
For full size crops eee for original link:

Sharpness and contrast of the Pentax are remarkably good @ F/1.8 I think. Results get better once stopped down a little. Both lenses are plenty sharp and contrasty; it seems they both outperform my sensor. Most remarkable difference is the DOF: at similar aperture settings the Pentax shows higher DOF. If this is due to the difference in focal length? My guess is that there is an actual difference in aperture.

For whoever is interested: I decided to sell the Pentax on Ebay. I still like both lenses, but the Tokina (being a macro lens) offers me a bit more flexibility.

02-16-2019, 09:50 AM   #2

Join Date: Oct 2011
Location: Savannah, GA
Posts: 5,312
QuoteOriginally posted by Caspert79 Quote
For whoever is interested: I decided to sell the Pentax on Ebay. I still like both lenses, but the Tokina (being a macro lens) offers me a bit more flexibility.
That's what I was going to say -- it comes down to whether you want the macro ability of the Tokina or you like to use the Pentax wide-open, although the Tokina is known for its bokeh as well. The Tokina of course was around for a while as a Vivitar Series 1 lens before the Tokina-branded ATX model -- I think there are some slight differences in the optics, but I can't remember quite what they are. They both need an adapter to go to 1:1 macro, which reminds me one of those matched ATX macro adapters that I need to list for sale myself.

Last edited by vonBaloney; 02-16-2019 at 09:55 AM.
02-16-2019, 09:55 AM   #3
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I think the main difference between the Viv S1 and the Tokina is the coating, the latter being superior. And the overall lens body of the Tokina is smaller. The F/2.5 of the Tokina for me is wide enough to make nice portraits. I was lucky enough to find the Tokina including the 1:1 adapter.

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85mm, aperture, dof, f/1.8, k-mount, lenses, pentax, pentax 85mm f/1.8, pentax lens, slr lens, smc pentax 85mm, tokina, tokina 90mm pentax 85mm, vs tokina at-x
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