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03-06-2016, 12:45 PM   #1
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Pentax k s2 lens compatibility

Hello guys,

I've bought a Pentax k s2 with kit lens 18-50 in white color from Amazon.

Quick question: do all the K mount lenses fit the k s2?
I'm considering purchasing a used Pentax k mount 185mm 3.5f available on eBay.

Thanks

03-06-2016, 01:00 PM   #2
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QuoteOriginally posted by Skd5509 Quote
Quick question: do all the K mount lenses fit the k s2?
Yes is the short answer. But of course it is not quite that simple. A k-mount lens will fit, but it will only function up to the ability of the lens. So for example a manual focus lens does not become auto focus.

Also when we say "all k-mount" we mean all Pentax made k-mount. Many, many other k-mount lenses from third parties also work but some caution is advised.
03-06-2016, 01:02 PM   #3
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Did you mean 135mm? Not sure there is a 185mm....

And do check the lens database here before buying anything.
03-06-2016, 03:09 PM   #4
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Pentax K-mount lenses will work. If they predate AF, they won't get AF (though you can use catch in focus function). If they predate auto-aperture, then camera cannot set aperture so you have to do it by hand.
There are many third party K-mount lenses, which will work, as well. Just note that a couple have a special pin in the back, which can get stuck on modern cameras (known as the Ricoh pin), so it is best to avoid those.
Lenses with m42 mount can be used on Pentax cameras with simple adapter.

You can get more specific advice if you tell us exactly what text is written on the lens (full name, focal length, aperture; note that one wrong letter or number can mean a different lens).

Is this the lens you meant? https://www.pentaxforums.com/lensreviews/SMC-Pentax-M-135mm-F3.5-Lens.html
It fits camera directly, but does not have AF and it does not have auto-aperture (so you need to meter by green button). Seems like a decent telephoto lens that can also be used for portraiture, maybe some animal (of non-dangerous animals or in zoos) and flower photos. If its your first manual lens, you might prefer a Pentax A 50mm f1.7, because it is not telephoto, it is a more everyday lens, and it has auto-aperture. There is also a Pentax M 50mm f1.7, same image quality, but no auto-aperture.
There are plenty of threads about how to use manual lenses on modern DSLR. I usually link to this one (its old, dont post in it, just read the instructons): https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html


Last edited by Na Horuk; 03-06-2016 at 03:17 PM.
03-06-2016, 03:49 PM   #5
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QuoteOriginally posted by Skd5509 Quote
Hello guys,

I've bought a Pentax k s2 with kit lens 18-50 in white color from Amazon.

Quick question: do all the K mount lenses fit the k s2?
I'm considering purchasing a used Pentax k mount 185mm 3.5f available on eBay.

Thanks
Yup they will

See this article for a quick reference:
Pentax K-Mount Lenses Explained: The differences between various Pentax lens series

And our new Pentax lens finder:

Pentax Lens Search | PentaxForums.com

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03-06-2016, 09:07 PM   #6
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QuoteOriginally posted by Na Horuk Quote
Pentax K-mount lenses will work. If they predate AF, they won't get AF (though you can use catch in focus function). If they predate auto-aperture, then camera cannot set aperture so you have to do it by hand.
There are many third party K-mount lenses, which will work, as well. Just note that a couple have a special pin in the back, which can get stuck on modern cameras (known as the Ricoh pin), so it is best to avoid those.
Lenses with m42 mount can be used on Pentax cameras with simple adapter.

You can get more specific advice if you tell us exactly what text is written on the lens (full name, focal length, aperture; note that one wrong letter or number can mean a different lens).

Is this the lens you meant? SMC Pentax-M 135mm F3.5 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database
It fits camera directly, but does not have AF and it does not have auto-aperture (so you need to meter by green button). Seems like a decent telephoto lens that can also be used for portraiture, maybe some animal (of non-dangerous animals or in zoos) and flower photos. If its your first manual lens, you might prefer a Pentax A 50mm f1.7, because it is not telephoto, it is a more everyday lens, and it has auto-aperture. There is also a Pentax M 50mm f1.7, same image quality, but no auto-aperture.
There are plenty of threads about how to use manual lenses on modern DSLR. I usually link to this one (its old, dont post in it, just read the instructons): https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html
Thanks Na Horuk!
Below is the screenshot of the description of the lens I'm considering

Detailed item info

Product InformationIdeal for photographers on the go, the Sakar-auto -JAPAN 135 mm f/3.5 lens is capable of capturing wildlife and sport-action photos as if the user were right next to the subject. The Pentax K mount made by sakar japan 135 mm f/3.5 lens is designed for exclusive use with all K mount SLR cameras. Delivering high optical performance, the lens elements within this camera lens coating, which protects the optic system from scratches and smudges that compromise photo quality. The a spherical and optical glass elements produce images with contrasting, vibrant colour and clear details. The weather- and dust-resistant shell protects this telephoto zoom lens from whatever harsh elements it is exposed. Users will enjoy the SDM focus system in this camera lens for Pentax that adjusts focus quietly with minimal movement. Photographers can also change from auto to manual focus via the Quick-Shift Focus System. This sakar-auto 135 mm f/3.5 lens is a high-quality prime lens ideal for any pentax K mount camera owners.

Lens SystemTypetele/Macro/Close UpFocus TypeManualFocal LengthFixed/PrimeFocal Length (mm)135 mmApertureF/3.5
CompatibilityCompatible BrandAll pentax K mount camera body Camera TechnologyFilm
03-06-2016, 10:02 PM   #7
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Hi Skd5509. Welcome aboard the forum.
03-06-2016, 10:22 PM   #8
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Thanks everyone for the warm welcome.
Shooting on manual mode Is quite exiting.
Would you recommend the tamron 70-300 mm + 2x converter lens for Astro shooting ?


Last edited by photolady95; 03-06-2016 at 10:29 PM.
03-07-2016, 10:39 AM   #9
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QuoteOriginally posted by Skd5509 Quote
Would you recommend the tamron 70-300 mm + 2x converter lens for Astro shooting ?
I would not recommend it, though it might be possible. Using a 2x converter on a consumer zoom is unlikely to produce a satisfactory result. Using a 2x converter on anything except a matched lens is not something I would bother with actually.

Converters cost you light. A 1.5x converter costs you 1 stop, a 2x costs you 2 stops. So your 70-300 is maybe f/5.6 @ 300mm?? Add two stops and you get f/11 wide open. Hard to see through to focus. AF will not work. You should stop that lens down a bit from wide open to get it sharp but when you do you are now at f/16.

If you want cheap astro try a 300mm prime and your 2x. Still not ideal but you should get reasonable results. A 300mm Takumar (M42 mount) plus an M42 2x tc is not all that expensive.
03-07-2016, 01:24 PM   #10
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QuoteOriginally posted by Skd5509 Quote
do all the K mount lenses fit the k s2?
Welcome, yes with different levels of functionality depending on the lens series.
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