Bought a lens adaptor and it won't fit

brento_numchuck · 03-10-2020, 10:59 AM

Originally posted by brento_numchuck

I searched up the lens and the Pentax forums lists it as such

---------- Post added 03-10-20 at 10:47 AM ----------

Overall, it has been a headache trying to find these lenses listed accurately at all, even when searching for the exact lens. I'm not super familiar with older lenses and the fact that they all just kind of came in a plastic basket with no paperwork or ID aside from what is on the lens hasnt helped identify what I need to be able to use them

And I just realised I didn't click on the lens with AF, the listing gives me a different mount entirely (Pentax KAF2/KAF)

Attached Images

**Serkevan** · 03-10-2020, 11:05 AM

Originally posted by brento_numchuck

I searched up the lens and the Pentax forums lists it as such

---------- Post added 03-10-20 at 10:47 AM ----------

Overall, it has been a headache trying to find these lenses listed accurately at all, even when searching for the exact lens. I'm not super familiar with older lenses and the fact that they all just kind of came in a plastic basket with no paperwork or ID aside from what is on the lens hasnt helped identify what I need to be able to use them

Ah... Sigma made that lens (and many others) in all possible mounts. You just have the "wrong one".
All variants of the K-mount (K, KA, KAF, KAF2) will mount on a K-mount camera. Other manufacturers also named the mount "PK".

stevebrot · 03-10-2020, 11:55 AM

Originally posted by brento_numchuck

And I just realised I didn't click on the lens with AF, the listing gives me a different mount entirely (Pentax KAF2/KAF)

Just a small "heads up"...If the brand is not Pentax, chances are the maker offered the model for Nikon, Canon, Sony, Olympus, Konica, and multiple other mounts.

Steve

**Apet-Sure** · 03-10-2020, 06:29 PM

Looks like there is a Pentax K-mount Sigma Super-Wide II f2.8 24mm for sale here:
Sigma Super Wide II 24 2.8 macro AF. Free shipping. - PentaxForums.com

micl161 · 03-10-2020, 08:06 PM

Originally posted by brento_numchuck

And I just realised I didn't click on the lens with AF, the listing gives me a different mount entirely (Pentax KAF2/KAF)

I think the 1st thing you need to understand is different camera (canon, pentax, sony...) have different mount so the lens use on each different camera will also have different mount. Just looking @ the front of the lens and the description (w/o saying what the mount is) will not tell you what camera this lens will fit (just like your case). You can see this sigma 24mm lens in pentax's forum and I'm sure you can find it in canon or nikon forum as well, they look similar but with DIFFERENT mount.

**yucatanPentax** · 03-10-2020, 10:35 PM

Match the mount on your lens with the image in the Pentax Forums Review of that model lens with a Pentax mount. Unfortunately, as others have said, you have that particular Sigma lens in another mount. The image shows a Pentax mount:

Ontarian50 · 03-11-2020, 08:24 AM

Yes, the OP's lens is definitely the Minolta A mount version - later used on Sony DSLRs.

However, the elephant in the room is this adapter was never going to work as hoped anyway.

Using an adapter like that to fit one lens type (Nikon, Pentax, or Minolta) to another lens mount (Pentax, Nikon, or Minolta) will add too much extension between lens and body, and the result is drastically close focus only (especially on a 24mm), and nothing else.

Just because these companies will happily ship you such an adapter doesn't mean it will work like you expect. Technically, that adapter will put a Pentax K lens onto a Nikon body, but unless your goal is macro photography you will be disappointed. The only adapters that allow distance focus have glass elements in them, and results are often disappointing.

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03-10-2020, 10:59 AM	#16
brento_numchuck New Member Join Date: Mar 2020 Posts: 6 Original Poster	Originally posted by brento_numchuck I searched up the lens and the Pentax forums lists it as such ---------- Post added 03-10-20 at 10:47 AM ---------- Overall, it has been a headache trying to find these lenses listed accurately at all, even when searching for the exact lens. I'm not super familiar with older lenses and the fact that they all just kind of came in a plastic basket with no paperwork or ID aside from what is on the lens hasnt helped identify what I need to be able to use them And I just realised I didn't click on the lens with AF, the listing gives me a different mount entirely (Pentax KAF2/KAF) Attached Images

03-10-2020, 11:05 AM	#17
Serkevan Site Supporter Join Date: May 2019 Photos: Albums Posts: 5,976	Originally posted by brento_numchuck I searched up the lens and the Pentax forums lists it as such ---------- Post added 03-10-20 at 10:47 AM ---------- Overall, it has been a headache trying to find these lenses listed accurately at all, even when searching for the exact lens. I'm not super familiar with older lenses and the fact that they all just kind of came in a plastic basket with no paperwork or ID aside from what is on the lens hasnt helped identify what I need to be able to use them Ah... Sigma made that lens (and many others) in all possible mounts. You just have the "wrong one". All variants of the K-mount (K, KA, KAF, KAF2) will mount on a K-mount camera. Other manufacturers also named the mount "PK".

03-10-2020, 11:55 AM	#18
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by brento_numchuck And I just realised I didn't click on the lens with AF, the listing gives me a different mount entirely (Pentax KAF2/KAF) Just a small "heads up"...If the brand is not Pentax, chances are the maker offered the model for Nikon, Canon, Sony, Olympus, Konica, and multiple other mounts. Steve

03-10-2020, 06:29 PM	#19
Apet-Sure Site Supporter Join Date: Dec 2015 Location: Goldsboro North Carolina Photos: Gallery \| Albums Posts: 2,872	Looks like there is a Pentax K-mount Sigma Super-Wide II f2.8 24mm for sale here: Sigma Super Wide II 24 2.8 macro AF. Free shipping. - PentaxForums.com

03-10-2020, 08:06 PM	#20
micl161 Senior Member Join Date: Mar 2014 Location: Hong Kong Posts: 127	Originally posted by brento_numchuck And I just realised I didn't click on the lens with AF, the listing gives me a different mount entirely (Pentax KAF2/KAF) I think the 1st thing you need to understand is different camera (canon, pentax, sony...) have different mount so the lens use on each different camera will also have different mount. Just looking @ the front of the lens and the description (w/o saying what the mount is) will not tell you what camera this lens will fit (just like your case). You can see this sigma 24mm lens in pentax's forum and I'm sure you can find it in canon or nikon forum as well, they look similar but with DIFFERENT mount.

03-10-2020, 10:35 PM	#21
yucatanPentax Loyal Site Supporter Join Date: Dec 2009 Location: Dallas / Yucatan Posts: 1,841	Match the mount on your lens with the image in the Pentax Forums Review of that model lens with a Pentax mount. Unfortunately, as others have said, you have that particular Sigma lens in another mount. The image shows a Pentax mount:

03-11-2020, 08:24 AM	#22
Ontarian50 Veteran Member Join Date: Mar 2015 Posts: 530	Yes, the OP's lens is definitely the Minolta A mount version - later used on Sony DSLRs. However, the elephant in the room is this adapter was never going to work as hoped anyway. Using an adapter like that to fit one lens type (Nikon, Pentax, or Minolta) to another lens mount (Pentax, Nikon, or Minolta) will add too much extension between lens and body, and the result is drastically close focus only (especially on a 24mm), and nothing else. Just because these companies will happily ship you such an adapter doesn't mean it will work like you expect. Technically, that adapter will put a Pentax K lens onto a Nikon body, but unless your goal is macro photography you will be disappointed. The only adapters that allow distance focus have glass elements in them, and results are often disappointing.