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Joshua A · 03-19-2019, 05:44 AM - **1 Like**

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As I am waiting for my DA560 to get back from a trip to Japan, GAS reared it's ugly head and led me to this, a seemingly incredibly rare lens in the form of the 'Sigma EX 800mm f5.6 AF', in K-mount no less. From the looks of things, it has a genuine Pentax style aperture ring, but unfortunately there are no pictures of the lens mount on the eBay listing. Any thoughts?

Sigma 800mm f5.6 APO EX* Pentax Fit 2 converters 2x 1.4x and Aluminum case | eBay

Docrwm · 03-19-2019, 06:18 AM

Given that it has a PK to M43 adapter mounted on it in a photo I would hazard to believe that it has a PK mount.

But that may not matter as the seller says:

Collection in person only
or on route to London hand delivery
If any local people interested in this lens there welcome
to contact me and do some test shots with it

**Pedrodelta** · 03-19-2019, 06:35 AM

Originally posted by Docrwm

Given that it has a PK to M43 adapter mounted on it in a photo I would hazard to believe that it has a PK mount.

But that may not matter as the seller says:

Collection in person only
or on route to London hand delivery
If any local people interested in this lens there welcome
to contact me and do some test shots with it

Looks reminiscent of a German Stick Grenade.

Could be useful for blowing images up I suppose!!!

**marcusBMG** · 03-19-2019, 07:35 AM - **1 Like**

The first mention of a 800mm apo is from 1991 on the sigma history page.This lens is from 1999 apparently, and is only listed as Nikon, Canon, Sigma mounts. Definitely requires mount clarification. Of itself I wouldn't pay anywhere near asking price for well used lens like this, BUT if it is pentax HSM (history spec page does say HSM) then rarity changes that.

Sigma 800mm F5.6 APO EX Launched June 1999 - Sigma Imaging (UK) Ltd

I can suggest the rarest is the 1000mm f8 from 1991 see this scan.

Last edited by marcusBMG; 03-19-2019 at 07:49 AM.

Wasp · 03-19-2019, 01:43 PM

From the size of the thing, I can see why the seller insists on collection in person.

abruzzi · 03-19-2019, 10:42 PM

Originally posted by Docrwm

Given that it has a PK to M43 adapter mounted on it in a photo I would hazard to believe that it has a PK mount.

Also the aperture ring has an "A". Nikon doesn't have that, I don't know about Sigma SA or Canon EF.

**ChrisPlatt** · 03-19-2019, 11:32 PM - **2 Likes**

I'm pretty sure the SMC Pentax-M 35/1.4 lens is the rarest.

Chris

Wasp · 03-23-2019, 09:20 AM

Originally posted by ChrisPlatt

I'm pretty sure the SMC Pentax-M 35/1.4 lens is the rarest.

Chris

So rare that it has only been seen in pictures released by Pentax?

angerdan · 02-02-2020, 06:37 AM

What has been the price tag of this copy?

angerdan · 08-19-2021, 07:01 AM

Originally posted by Joshua A

a seemingly incredibly rare lens in the form of the 'Sigma EX 800mm f5.6 AF', in K-mount no less.
Sigma 800mm f5.6 APO EX* Pentax Fit 2 converters 2x 1.4x and Aluminum case | eBay

What has been the price tag of this copy?

angerdan · 06-27-2022, 10:24 AM

Originally posted by Docrwm

But that may not matter as the seller says:

Collection in person only
or on route to London hand delivery
If any local people interested in this lens there welcome
to contact me and do some test shots with it

Do you remember the sellers price tag for this lens?

**Lowell Goudge** · 06-27-2022, 01:35 PM

There is a PF member in the uk who has one of these. He has posted shots reciently

angerdan · 06-28-2022, 05:25 AM

Yea, for $2350:
Sigma 800mm F5.6 APO EX Lens Reviews - Sigma Lenses - Pentax Lens Review Database

bdery · 06-28-2022, 06:13 AM

Certainly rare, and with AF no less!

Rarest is a bold statement. I've once owned a lens that I didn't know existed, and had rarely seen listed anywhere, the Vivitar 120-600mm. The Pentax 35mm F1.4 is also a good example. Some other lenses come to mind. "Among the rarest" is a safer phrasing

03-19-2019, 05:44 AM - 1 Like	#1
Joshua A Senior Member Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 273	Is this the rarest K-Mount lens? (Sigma 800mm f5.6) Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. As I am waiting for my DA560 to get back from a trip to Japan, GAS reared it's ugly head and led me to this, a seemingly incredibly rare lens in the form of the 'Sigma EX 800mm f5.6 AF', in K-mount no less. From the looks of things, it has a genuine Pentax style aperture ring, but unfortunately there are no pictures of the lens mount on the eBay listing. Any thoughts? Sigma 800mm f5.6 APO EX* Pentax Fit 2 converters 2x 1.4x and Aluminum case \| eBay

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03-19-2019, 06:18 AM	#2
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Given that it has a PK to M43 adapter mounted on it in a photo I would hazard to believe that it has a PK mount. But that may not matter as the seller says: Collection in person only or on route to London hand delivery If any local people interested in this lens there welcome to contact me and do some test shots with it

03-19-2019, 06:35 AM	#3
Pedrodelta Site Supporter Join Date: Aug 2012 Location: Blighty Posts: 61	Originally posted by Docrwm Given that it has a PK to M43 adapter mounted on it in a photo I would hazard to believe that it has a PK mount. But that may not matter as the seller says: Collection in person only or on route to London hand delivery If any local people interested in this lens there welcome to contact me and do some test shots with it Looks reminiscent of a German Stick Grenade. Could be useful for blowing images up I suppose!!!

03-19-2019, 07:35 AM - 1 Like	#4
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,870	The first mention of a 800mm apo is from 1991 on the sigma history page.This lens is from 1999 apparently, and is only listed as Nikon, Canon, Sigma mounts. Definitely requires mount clarification. Of itself I wouldn't pay anywhere near asking price for well used lens like this, BUT if it is pentax HSM (history spec page does say HSM) then rarity changes that. Sigma 800mm F5.6 APO EX Launched June 1999 - Sigma Imaging (UK) Ltd I can suggest the rarest is the 1000mm f8 from 1991 see this scan. Last edited by marcusBMG; 03-19-2019 at 07:49 AM.

03-19-2019, 01:43 PM	#5
Wasp Pentaxian Join Date: Mar 2017 Location: Pretoria Photos: Gallery Posts: 4,661	From the size of the thing, I can see why the seller insists on collection in person.

03-19-2019, 10:42 PM	#6
abruzzi Veteran Member Join Date: Apr 2017 Location: New Mexico Posts: 788	Originally posted by Docrwm Given that it has a PK to M43 adapter mounted on it in a photo I would hazard to believe that it has a PK mount. Also the aperture ring has an "A". Nikon doesn't have that, I don't know about Sigma SA or Canon EF.

03-19-2019, 11:32 PM - 2 Likes	#7
ChrisPlatt Site Supporter Join Date: Nov 2007 Location: Rockaway Beach NYC Posts: 7,697	I'm pretty sure the SMC Pentax-M 35/1.4 lens is the rarest. Chris

03-23-2019, 09:20 AM	#8
Wasp Pentaxian Join Date: Mar 2017 Location: Pretoria Photos: Gallery Posts: 4,661	Originally posted by ChrisPlatt I'm pretty sure the SMC Pentax-M 35/1.4 lens is the rarest. Chris So rare that it has only been seen in pictures released by Pentax?

02-02-2020, 06:37 AM	#9
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,643	What has been the price tag of this copy?

08-19-2021, 07:01 AM	#10
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,643	Originally posted by Joshua A a seemingly incredibly rare lens in the form of the 'Sigma EX 800mm f5.6 AF', in K-mount no less. Sigma 800mm f5.6 APO EX* Pentax Fit 2 converters 2x 1.4x and Aluminum case \| eBay What has been the price tag of this copy?

06-27-2022, 10:24 AM	#11
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,643	Originally posted by Docrwm But that may not matter as the seller says: Collection in person only or on route to London hand delivery If any local people interested in this lens there welcome to contact me and do some test shots with it Do you remember the sellers price tag for this lens?

06-27-2022, 01:35 PM	#12
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	There is a PF member in the uk who has one of these. He has posted shots reciently

06-28-2022, 05:25 AM	#13
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,643	Yea, for $2350: Sigma 800mm F5.6 APO EX Lens Reviews - Sigma Lenses - Pentax Lens Review Database

06-28-2022, 06:13 AM	#14
bdery Pentaxian Join Date: Mar 2008 Location: Quebec city, Canada Photos: Gallery Posts: 9,362	Certainly rare, and with AF no less! Rarest is a bold statement. I've once owned a lens that I didn't know existed, and had rarely seen listed anywhere, the Vivitar 120-600mm. The Pentax 35mm F1.4 is also a good example. Some other lenses come to mind. "Among the rarest" is a safer phrasing

Is this the rarest K-Mount lens? (Sigma 800mm f5.6)

Win a Pentax Limited Lens: Raffle Now Live!