M42 Lenses With Teleconverter (Rear Converter)

**tomw95** · 08-19-2012, 05:14 AM

I was just wondering if there are any technical issues or problems with using an M42 lens on a K-Mount teleconverter with an M42 adapter, in other words the combination would be:

Pentax DSLR + Teleconverter + M42 Adapter + M42 Lens

Many Thanks

bimjo · 08-19-2012, 06:09 AM

Other than the requisite light loss from the teleconverter (and potential image degradation) there shoudl be no issues.

**tomw95** · 08-19-2012, 06:42 AM

Originally posted by bimjo

Other than the requisite light loss from the teleconverter (and potential image degradation) there shoudl be no issues.

So basically the same issues as one might expect from a normal K-Mount lens. Thanks for the help.

Paleo Pete · 08-28-2012, 06:49 AM

Sorry I didn't see this before, I've used mine that way, and had no problems with it. I also have M42 teleconverters, but wanted to try it and see. The only problem I had was the usual light loss as mentioned already. Otherwise it seemed to work fine, except for the usual image degradation I've always seen with teleconverters. I rarely use them because of that. But as far as using it as you describe, K mount teleconverter with M42 adapter then lens, it should work fine, mine gave me no problems. The M42 adapter was a bit difficult to remove for some reason, but not a big problem. Maybe the mount is a bit tighter...

08-19-2012, 05:14 AM	#1
tomw95 Site Supporter Join Date: Dec 2010 Location: London Posts: 39	M42 Lenses With Teleconverter (Rear Converter) I was just wondering if there are any technical issues or problems with using an M42 lens on a K-Mount teleconverter with an M42 adapter, in other words the combination would be: Pentax DSLR + Teleconverter + M42 Adapter + M42 Lens Many Thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
For Sale - Sold: Pentax 2X-S Rear Converter-A teleconverter	greg_77	Sold Items	7	08-14-2012 08:27 AM
Wanted - Acquired: 6x7 1.4X teleconverter (rear converter)	littledrawe	Sold Items	2	01-22-2012 08:01 PM
For Sale - Sold: Pentax SMC 1.4x-S & 2x-S Rear Converter A (TeleConverter)	frank	Sold Items	7	06-21-2009 02:22 PM
For Sale - Sold: Pentax Rear Converter-A 2X-S 2X Teleconverter	heliphoto	Sold Items	5	12-24-2008 07:41 AM

08-19-2012, 06:09 AM	#2
bimjo Veteran Member Join Date: Jan 2008 Location: Pasco, WA Posts: 967	Other than the requisite light loss from the teleconverter (and potential image degradation) there shoudl be no issues.

08-19-2012, 06:42 AM	#3
tomw95 Site Supporter Join Date: Dec 2010 Location: London Posts: 39 Original Poster	Originally posted by bimjo Other than the requisite light loss from the teleconverter (and potential image degradation) there shoudl be no issues. So basically the same issues as one might expect from a normal K-Mount lens. Thanks for the help.

08-28-2012, 06:49 AM	#4
Paleo Pete Veteran Member Join Date: Jun 2010 Location: Texas Photos: Gallery \| Albums Posts: 2,880	Sorry I didn't see this before, I've used mine that way, and had no problems with it. I also have M42 teleconverters, but wanted to try it and see. The only problem I had was the usual light loss as mentioned already. Otherwise it seemed to work fine, except for the usual image degradation I've always seen with teleconverters. I rarely use them because of that. But as far as using it as you describe, K mount teleconverter with M42 adapter then lens, it should work fine, mine gave me no problems. The M42 adapter was a bit difficult to remove for some reason, but not a big problem. Maybe the mount is a bit tighter...