K-Q adapters & C mount lens questions

weijen · 01-15-2013, 12:03 AM

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Hi, now that I've a Q, I would like to get some accessories. So ebay is the place to go, but unfortunately they don't describe the stuff very well.

First, for the third party K-Q adapter, how can I identify (from photos and description) if it it allows aparture control? The fotodiox one does have aperture control, what about the rest of the ebay ones?

Secondly, how can I identify if a CCTV lens is C or CS mount basing on the photo and specifications? It seems most new lenses are CS mount. Is it possible for the Q to work with CS lenses?

Thanks,

**crewl1** · 01-15-2013, 12:56 AM

The only one I know of on ebay that also has aperture control is the one from RJ RJ Pentax PK PK A AF Da Lens to Pentax Q Adapter with Tripod Mount Aperture Ring | eBay

I haven't tried any c mounts, you may want to ask in one of the threads about that topic.

weijen · 01-15-2013, 12:59 AM

Thanks, there's a C mount thread here?

**crewl1** · 01-15-2013, 01:08 AM

https://www.pentaxforums.com/forums/pentax-q/210646-c-mount-lenses-q-worth-messing.html

https://www.pentaxforums.com/forums/pentax-q/210949-0-5x-wide-angel-attachmen...ide-angle.html

https://www.pentaxforums.com/forums/pentax-q/211126-cctv-2-5mm-cs.html

hnikesch · 01-15-2013, 06:35 AM

Originally posted by weijen

Secondly, how can I identify if a CCTV lens is C or CS mount basing on the photo and specifications? It seems most new lenses are CS mount. Is it possible for the Q to work with CS lenses?

Thanks,

Most sellers I have dealt with are very loose with the description of C & CS mount lenses. I have ordered 6 C mount lenses and I was sure by the description I was getting C mount only to receive 5 CS lenses and only 1 C mount. Most suppliers list lenses from several manufactures and may not have them in stock then ship the closest thing they have. I have ordered lenses based on images of C mount on a sellers ad and still received CS. Based on what I have received to date CCTV lens are made to resolve about 3 or 4 mp image and on a 12 mp camera they are soft but a 2.5mm sure is wide.

Hans

GibbyTheMole · 01-15-2013, 06:57 AM

Originally posted by weijen

First, for the third party K-Q adapter, how can I identify (from photos and description) if it it allows aparture control? The fotodiox one does have aperture control, what about the rest of the ebay ones?

Here's the one I have. It has aperture control & it's $26 from Amazon. Same as the RJ, only cheaper. The ones with aperture control have a ring that says "Lock" and "Open".

Originally posted by weijen

Secondly, how can I identify if a CCTV lens is C or CS mount basing on the photo and specifications? It seems most new lenses are CS mount. Is it possible for the Q to work with CS lenses?

Personally, I'd e-mail the seller and make sure it's C-mount before you buy. You can't normally use CS mount on a Q. The registration distance is too short.

Cheers,
Bobbo :-)

weijen · 01-16-2013, 07:14 PM

Originally posted by hnikesch

Most sellers I have dealt with are very loose with the description of C & CS mount lenses. I have ordered 6 C mount lenses and I was sure by the description I was getting C mount only to receive 5 CS lenses and only 1 C mount

I won't really blame the ebay sellers. I've looked at a few lenses at my campus labs. None of them have any indications whether they are C or CS. In the lab I take care of, there are 2 CCTVs which we use for robot vision. If I swap the lenses of the cameras, neither could focus at all. So my guess is that one is a C and the other is a CS. The thing is, there are absolutely no indications on any of the cameras and lenses that identify the kind of mount or the flange distance!

01-15-2013, 12:03 AM	#1
weijen Senior Member Join Date: Jul 2012 Posts: 105	K-Q adapters & C mount lens questions 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. Hi, now that I've a Q, I would like to get some accessories. So ebay is the place to go, but unfortunately they don't describe the stuff very well. First, for the third party K-Q adapter, how can I identify (from photos and description) if it it allows aparture control? The fotodiox one does have aperture control, what about the rest of the ebay ones? Secondly, how can I identify if a CCTV lens is C or CS mount basing on the photo and specifications? It seems most new lenses are CS mount. Is it possible for the Q to work with CS lenses? Thanks,

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01-15-2013, 12:56 AM	#2
crewl1 Site Supporter Join Date: Jul 2010 Location: Los Angeles, CA Photos: Gallery \| Albums Posts: 9,807	The only one I know of on ebay that also has aperture control is the one from RJ RJ Pentax PK PK A AF Da Lens to Pentax Q Adapter with Tripod Mount Aperture Ring \| eBay I haven't tried any c mounts, you may want to ask in one of the threads about that topic.

01-15-2013, 12:59 AM	#3
weijen Senior Member Join Date: Jul 2012 Posts: 105 Original Poster	Thanks, there's a C mount thread here?

01-15-2013, 01:08 AM	#4
crewl1 Site Supporter Join Date: Jul 2010 Location: Los Angeles, CA Photos: Gallery \| Albums Posts: 9,807	https://www.pentaxforums.com/forums/pentax-q/210646-c-mount-lenses-q-worth-messing.html https://www.pentaxforums.com/forums/pentax-q/210949-0-5x-wide-angel-attachmen...ide-angle.html https://www.pentaxforums.com/forums/pentax-q/211126-cctv-2-5mm-cs.html

01-15-2013, 06:35 AM	#5
hnikesch Veteran Member Join Date: May 2009 Location: Michigan, USA Photos: Albums Posts: 1,316	Originally posted by weijen Secondly, how can I identify if a CCTV lens is C or CS mount basing on the photo and specifications? It seems most new lenses are CS mount. Is it possible for the Q to work with CS lenses? Thanks, Most sellers I have dealt with are very loose with the description of C & CS mount lenses. I have ordered 6 C mount lenses and I was sure by the description I was getting C mount only to receive 5 CS lenses and only 1 C mount. Most suppliers list lenses from several manufactures and may not have them in stock then ship the closest thing they have. I have ordered lenses based on images of C mount on a sellers ad and still received CS. Based on what I have received to date CCTV lens are made to resolve about 3 or 4 mp image and on a 12 mp camera they are soft but a 2.5mm sure is wide. Hans

01-15-2013, 06:57 AM	#6
GibbyTheMole Veteran Member Join Date: Nov 2009 Location: Iowa Photos: Albums Posts: 2,275	Originally posted by weijen First, for the third party K-Q adapter, how can I identify (from photos and description) if it it allows aparture control? The fotodiox one does have aperture control, what about the rest of the ebay ones? Here's the one I have. It has aperture control & it's $26 from Amazon. Same as the RJ, only cheaper. The ones with aperture control have a ring that says "Lock" and "Open". Originally posted by weijen Secondly, how can I identify if a CCTV lens is C or CS mount basing on the photo and specifications? It seems most new lenses are CS mount. Is it possible for the Q to work with CS lenses? Personally, I'd e-mail the seller and make sure it's C-mount before you buy. You can't normally use CS mount on a Q. The registration distance is too short. Cheers, Bobbo :-)

01-16-2013, 07:14 PM	#7
weijen Senior Member Join Date: Jul 2012 Posts: 105 Original Poster	Originally posted by hnikesch Most sellers I have dealt with are very loose with the description of C & CS mount lenses. I have ordered 6 C mount lenses and I was sure by the description I was getting C mount only to receive 5 CS lenses and only 1 C mount I won't really blame the ebay sellers. I've looked at a few lenses at my campus labs. None of them have any indications whether they are C or CS. In the lab I take care of, there are 2 CCTVs which we use for robot vision. If I swap the lenses of the cameras, neither could focus at all. So my guess is that one is a C and the other is a CS. The thing is, there are absolutely no indications on any of the cameras and lenses that identify the kind of mount or the flange distance!