k mount lense to screwbase spotmatic adaptor

jdn · 08-05-2019, 04:47 PM

I see adaptors for old screw mount lenses to mount on k mount cameras. I haven't seen the reverse. Are they out there? I would like to use my old spotmatic with some of my newer lenses. I'm assuming the AF or manual issue would not be a problem as long as I shoot manual

**ismaelg** · 08-05-2019, 04:53 PM - **1 Like**

Hello,

No, That is not possible due to physical dimensions and registration (distance from the lens to the film plane). K mount s bigger than M42. That's why you can adapt M42 screwmount to K mount while keeping registration.

Thanks,

**tonyzoc** · 08-05-2019, 05:15 PM

You night be able to rig up a Bellow or make an extension tube for macro work but that's about it I think...even then you'll have to make something yourself.

jdn · 08-05-2019, 05:18 PM

Thanks, guess I will keep my eye out for some bargain nice lenses

**boriscleto** · 08-05-2019, 05:44 PM

Originally posted by jdn

Thanks, guess I will keep my eye out for some bargain nice lenses

Look for one of the 55mm Super Takumars...or a SMC Takumar...The F1.8 and F2 are optically the same, the F2 is mechanically restricted to F2.

**niels hansen** · 08-06-2019, 12:57 AM

Originally posted by jdn

I see adaptors for old screw mount lenses to mount on k mount cameras. I haven't seen the reverse. Are they out there? I would like to use my old spotmatic with some of my newer lenses. I'm assuming the AF or manual issue would not be a problem as long as I shoot manual

I have not seen any IQ differens between m 42 and equivalent k bayonet lenses

nickthetasmaniac · 08-06-2019, 06:04 AM

Originally posted by jdn

Thanks, guess I will keep my eye out for some bargain nice lenses

The wonderful (and often cheap) Takumars are one of the great reasons to use a Spotmatic. Embrace the M42

Not a Number · 08-06-2019, 06:43 AM

Originally posted by tonyzoc

You night be able to rig up a Bellow or make an extension tube for macro work but that's about it I think...even then you'll have to make something yourself.

There is a company PrecisionParts that makes custom telescope adapters to order. A K-mount to M42 screwmount adapter needs to have a minimum of 15.5mm of extension (to accommodate the K bayonet) and run a minimum of $199.00 USD.

So basically you'll have an expensive extension tube with no aperture lever and your K-mount lenses will only be good for close-up and macro work.

You can buy some nice screwmount lenses with $199 USD.

titrisol · 08-07-2019, 05:55 PM

Not so cheap anymore... since the Canon/Sony crew figured out how great this glass is and how easy it was to adapt to their cameras

Originally posted by nickthetasmaniac

The wonderful (and often cheap) Takumars are one of the great reasons to use a Spotmatic. Embrace the M42

nickthetasmaniac · 08-07-2019, 09:03 PM - **1 Like**

Originally posted by titrisol

Not so cheap anymore... since the Canon/Sony crew figured out how great this glass is and how easy it was to adapt to their cameras

I know what you mean, but just going off the front page classifieds on PF today, you could build a three lens Super Takumar kit (35, 55, 200) for ~$150... In the grand scheme of things, that's still pretty 'cheap'.

08-05-2019, 04:47 PM	#1
jdn New Member Join Date: Mar 2012 Posts: 10	k mount lense to screwbase spotmatic adaptor I see adaptors for old screw mount lenses to mount on k mount cameras. I haven't seen the reverse. Are they out there? I would like to use my old spotmatic with some of my newer lenses. I'm assuming the AF or manual issue would not be a problem as long as I shoot manual

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08-05-2019, 04:53 PM - 1 Like	#2
ismaelg Loyal Site Supporter Join Date: Apr 2009 Location: Puerto Rico Photos: Gallery Posts: 2,681	Hello, No, That is not possible due to physical dimensions and registration (distance from the lens to the film plane). K mount s bigger than M42. That's why you can adapt M42 screwmount to K mount while keeping registration. Thanks,

08-05-2019, 05:15 PM	#3
tonyzoc Loyal Site Supporter Join Date: Jul 2018 Posts: 992	You night be able to rig up a Bellow or make an extension tube for macro work but that's about it I think...even then you'll have to make something yourself.

08-05-2019, 05:18 PM	#4
jdn New Member Join Date: Mar 2012 Posts: 10 Original Poster	Thanks, guess I will keep my eye out for some bargain nice lenses

08-05-2019, 05:44 PM	#5
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by jdn Thanks, guess I will keep my eye out for some bargain nice lenses Look for one of the 55mm Super Takumars...or a SMC Takumar...The F1.8 and F2 are optically the same, the F2 is mechanically restricted to F2.

08-06-2019, 12:57 AM	#6
niels hansen Site Supporter Join Date: Aug 2017 Posts: 343	Originally posted by jdn I see adaptors for old screw mount lenses to mount on k mount cameras. I haven't seen the reverse. Are they out there? I would like to use my old spotmatic with some of my newer lenses. I'm assuming the AF or manual issue would not be a problem as long as I shoot manual I have not seen any IQ differens between m 42 and equivalent k bayonet lenses

08-06-2019, 06:04 AM	#7
nickthetasmaniac Pentaxian Join Date: Dec 2008 Posts: 2,361	Originally posted by jdn Thanks, guess I will keep my eye out for some bargain nice lenses The wonderful (and often cheap) Takumars are one of the great reasons to use a Spotmatic. Embrace the M42

08-06-2019, 06:43 AM	#8
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Originally posted by tonyzoc You night be able to rig up a Bellow or make an extension tube for macro work but that's about it I think...even then you'll have to make something yourself. There is a company PrecisionParts that makes custom telescope adapters to order. A K-mount to M42 screwmount adapter needs to have a minimum of 15.5mm of extension (to accommodate the K bayonet) and run a minimum of $199.00 USD. So basically you'll have an expensive extension tube with no aperture lever and your K-mount lenses will only be good for close-up and macro work. You can buy some nice screwmount lenses with $199 USD.

08-07-2019, 05:55 PM	#9
titrisol Pentaxian Join Date: Dec 2007 Location: In the most populated state... state of denial Photos: Gallery \| Albums Posts: 1,852	Not so cheap anymore... since the Canon/Sony crew figured out how great this glass is and how easy it was to adapt to their cameras Originally posted by nickthetasmaniac The wonderful (and often cheap) Takumars are one of the great reasons to use a Spotmatic. Embrace the M42

08-07-2019, 09:03 PM - 1 Like	#10
nickthetasmaniac Pentaxian Join Date: Dec 2008 Posts: 2,361	Originally posted by titrisol Not so cheap anymore... since the Canon/Sony crew figured out how great this glass is and how easy it was to adapt to their cameras I know what you mean, but just going off the front page classifieds on PF today, you could build a three lens Super Takumar kit (35, 55, 200) for ~$150... In the grand scheme of things, that's still pretty 'cheap'.