Win a Pentax Limited Lens: Raffle Now Live!

**babywriter** · 02-18-2016, 09:35 AM

All -

I'm definitely a newbie, but I have the lens-shopping bug and have been haunting various auction sites for good deals on both modern and vintage lenses.

I've attached a picture of a lens mount. The lens is a Sigma 170-500mm 1:5-6.3 APO (!) and is available for a really good price.

My question is: is this a K mount? It seems to have an autofocus screw, the shape is right, but I don't see any contact points for metering.

Any help appreciated. Thanks!

Attached Images

Not a Number · 02-18-2016, 09:48 AM

Probably Nikon. The alignment spot is in the wrong place in relation to mounting pin hole. There is also a control tab external to the mount which isn't found on K-mount lenses.

**babywriter** · 02-18-2016, 09:53 AM

Ah, okay. Thanks so much! I was hoping....

**boriscleto** · 02-18-2016, 10:00 AM

It's a Nikon.

**babywriter** · 02-18-2016, 10:12 AM

I can usually tell the difference, but this one just made me hesitate for some reason. Thanks for the help!

excanonfd · 02-18-2016, 10:47 AM

Who else aside from Pentax used screw drive AF?

excanonfd · 02-18-2016, 11:11 AM

Thanks, so Pentax lenses aren't the only ones that sounds like a traffic jam heard from a distance.

Does either Sony or Nikon modern bodies support the screw drive AF?

**babywriter** · 02-18-2016, 11:13 AM

Looking at that last picture, I can see clearly how the lens I posted is a Nikon. The angle of the original picture made the contact bumps look like reflections to me (or something other than what they are).

**boriscleto** · 02-18-2016, 11:19 AM

Originally posted by excanonfd

Does either Sony or Nikon modern bodies support the screw drive AF?

Nikon removed the screw drive from the low end bodies starting with the D40, the earlier D50 had a screw drive. The D5xxx series also lacks the screw drive. This was simply done to force those buying low end bodies to buy new lenses. It is the reason I bought a K-x instead of a D5000.

I'm sure Sony left the screw drive in at least some of its DSLR bodies. Maybe even the DSLT bodies.

micromacro · 02-18-2016, 11:40 AM

If you don't mind to use this lens with MF, and if the price is really amazingly low, nikon-pentax adapter may help.
I've never use that, but I used nikon lens on canon with adapter as a manual lens. Then sold my old nikon lenses and bought pentax

**boriscleto** · 02-18-2016, 11:56 AM

Originally posted by micromacro

If you don't mind to use this lens with MF, and if the price is really amazingly low, nikon-pentax adapter may help.
I've never use that, but I used nikon lens on canon with adapter as a manual lens. Then sold my old nikon lenses and bought pentax

Unless the adapter has an aperture ring a 170-500 isn't going to work.

**babywriter** · 02-18-2016, 12:00 PM

Here's the link. It's seeing a lot of interest early, so I don't think the price is going to stay low, but with a lens of this type, "low" is relative:

shopgoodwill.com - #27813938 - Sigma 170-500mm 1:5-6.3 D Camera Lens - 2/25/2016 5:30:00 PM

I don't have interest if it's not a K mount.

excanonfd · 02-18-2016, 01:49 PM

Thanks boriscleto, dcshooter. Soon it looks like we will be the only dinosaur left but with the new K-1 on the horizon, extinction won't be happening anytime soon.

02-18-2016, 09:35 AM	#1
babywriter Site Supporter Join Date: Jan 2016 Location: central Iowa Photos: Gallery Posts: 969	Can anyone tell me if this is a K mount? All - I'm definitely a newbie, but I have the lens-shopping bug and have been haunting various auction sites for good deals on both modern and vintage lenses. I've attached a picture of a lens mount. The lens is a Sigma 170-500mm 1:5-6.3 APO (!) and is available for a really good price. My question is: is this a K mount? It seems to have an autofocus screw, the shape is right, but I don't see any contact points for metering. Any help appreciated. Thanks! Attached Images

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Can anyone tell me if the grip takes AAs like the k-3 and is the battery the same as	Sorver	Pentax K-1 & K-1 II	6	02-22-2016 08:00 PM
Can anyone tell me (approximately) what magnification this is?	narual	Troubleshooting and Beginner Help	3	07-22-2013 08:11 PM
Can anyone tell me what this is and where to get one?	Yamaha	Troubleshooting and Beginner Help	8	05-19-2013 08:12 AM
Hello, can you guys look at this lens and tell me if it will fit my K-30?	spectamaniac	Pentax SLR Lens Discussion	2	02-14-2013 10:05 PM
Can anyone tell me what this ring on Tamron lens is?	looktime	Pentax SLR Lens Discussion	5	04-07-2011 04:51 AM

02-18-2016, 09:48 AM	#2
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Probably Nikon. The alignment spot is in the wrong place in relation to mounting pin hole. There is also a control tab external to the mount which isn't found on K-mount lenses.

02-18-2016, 09:53 AM	#3
babywriter Site Supporter Join Date: Jan 2016 Location: central Iowa Photos: Gallery Posts: 969 Original Poster	Ah, okay. Thanks so much! I was hoping....

02-18-2016, 10:00 AM	#4
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	It's a Nikon.

02-18-2016, 10:12 AM	#5
babywriter Site Supporter Join Date: Jan 2016 Location: central Iowa Photos: Gallery Posts: 969 Original Poster	I can usually tell the difference, but this one just made me hesitate for some reason. Thanks for the help!

02-18-2016, 10:47 AM	#6
excanonfd Veteran Member Join Date: Jan 2010 Location: Vancouver, BC Posts: 1,421	Who else aside from Pentax used screw drive AF?

02-18-2016, 11:11 AM	#7
excanonfd Veteran Member Join Date: Jan 2010 Location: Vancouver, BC Posts: 1,421	Thanks, so Pentax lenses aren't the only ones that sounds like a traffic jam heard from a distance. Does either Sony or Nikon modern bodies support the screw drive AF?

02-18-2016, 11:13 AM	#8
babywriter Site Supporter Join Date: Jan 2016 Location: central Iowa Photos: Gallery Posts: 969 Original Poster	Looking at that last picture, I can see clearly how the lens I posted is a Nikon. The angle of the original picture made the contact bumps look like reflections to me (or something other than what they are).

02-18-2016, 11:19 AM	#9
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	Originally posted by excanonfd Does either Sony or Nikon modern bodies support the screw drive AF? Nikon removed the screw drive from the low end bodies starting with the D40, the earlier D50 had a screw drive. The D5xxx series also lacks the screw drive. This was simply done to force those buying low end bodies to buy new lenses. It is the reason I bought a K-x instead of a D5000. I'm sure Sony left the screw drive in at least some of its DSLR bodies. Maybe even the DSLT bodies.

02-18-2016, 11:40 AM	#10
micromacro Pentaxian Join Date: Jan 2014 Location: Florida Photos: Gallery Posts: 3,722	If you don't mind to use this lens with MF, and if the price is really amazingly low, nikon-pentax adapter may help. I've never use that, but I used nikon lens on canon with adapter as a manual lens. Then sold my old nikon lenses and bought pentax

02-18-2016, 11:56 AM	#11
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	Originally posted by micromacro If you don't mind to use this lens with MF, and if the price is really amazingly low, nikon-pentax adapter may help. I've never use that, but I used nikon lens on canon with adapter as a manual lens. Then sold my old nikon lenses and bought pentax Unless the adapter has an aperture ring a 170-500 isn't going to work.

02-18-2016, 12:00 PM	#12
babywriter Site Supporter Join Date: Jan 2016 Location: central Iowa Photos: Gallery Posts: 969 Original Poster	Here's the link. It's seeing a lot of interest early, so I don't think the price is going to stay low, but with a lens of this type, "low" is relative: shopgoodwill.com - #27813938 - Sigma 170-500mm 1:5-6.3 D Camera Lens - 2/25/2016 5:30:00 PM I don't have interest if it's not a K mount.

02-18-2016, 01:49 PM	#13
excanonfd Veteran Member Join Date: Jan 2010 Location: Vancouver, BC Posts: 1,421	Thanks boriscleto, dcshooter. Soon it looks like we will be the only dinosaur left but with the new K-1 on the horizon, extinction won't be happening anytime soon.

Can anyone tell me if this is a K mount?

Win a Pentax Limited Lens: Raffle Now Live!