Another cult lens

[ferider]

Thanks guys.

I did it just for fun. Got the lens from a friend who didn't have a Pentax body, and neither do I. My wife wouldn't like me getting into another camera system, that usually requires a second body, more lenses, etc. 🙂

From the Leica viewpoint, you might like a 50/1.4, that has a great signature, is relatively compact, has a minimum focus of less than 0.7m (the above combo couples down to 0.65m), and sets you back less then US 200, if you use an adapter like http://www.ebay.com/itm/250916389253.

Kevin, the lens intrudes about 15-20% into the 50mm framelines of the M4P.

This mod only works for a couple of reasons:

1) the focal length of the Pentax lens is close to 51.6mm
2) the rear element is easily accessible (for example, with my OM Zuiko 50/1.4, it is not)
3) the separate ring of the last element really helps in doing the mod, and not distroying the glass.

You only need to disassemble the lens that far:

4a and 4b are baffles that are not needed any more. 1/2/3 are the rear element and its retaining ring (which is used for RF cam attachment).

BTW, the Novoflex adapter remained untouched.

Thanks again,

Roland.

 

[raid]

It is not RF coupled ... right?

 

[FrankS]

It looks to be, Raid.

 

[ferider]

It is, Raid, that's the only thing I did (pictures 3 and 4). This piece was the only thing done in my workshop (out of a brass pipe):

 

[f16sunshine]

So this is the M(K-Mount) version of the lens not the M42 version as I originally thought.
I have 2 of the M42 lenses here. I wonder if it is the same mod for the screw mount lens.

 

[Leigh Youdale]

I've been given a very nice example of the Rollei SL35 50/1.8 HFT lens and wondering if there was a way to couple it to my M6.

 

[raid]

Leigh: Amedeo once offered a conversion, and I missed that one chance. Now, he is not anymore considering such a conversion. Instead, he is making conversions for Nikon 50/1.2 to an M lens.

 

[splitimageview]

Sweet. 🙂

 

[raid]

It is, Raid, that's the only thing I did (pictures 3 and 4). This piece was the only thing done in my workshop (out of a brass pipe):

Excellent. Bravo.
I am impressed, Roland.

 

[raid]

Now you can start a side job for RFF members!
I will be your first customer.

 

[jsrockit]

Cool, but not practical. Cool anyway.

 

[gdmcclintock]

Totally awesome, dude!

 

[gb hill]

Cool Roland. Look forward to seeing some results. I have an old GSN for parts I wish I could somehow convert the 45mm lens to ltm. You have me thinking now.🙂

 

[it'sawhat?]

very cool always liked pentax glass but have to admit the 1.8 was my 50 of choice.

 

[redisburning]

hmmm...

does it have to be a 50? the idea of my rokkor 58/1.2 on my M2 is very enticing even without accurate framing.

 

[FrankS]

I think Roland was telling us that in order for the rf coupling to work, the lens needs to be a focal length of 51mm and a little bit. So, the yashica 45 and rokkor 58 won't rf couple accurately with the Leica.

 

[raid]

Would any 50mm be OK?

 

[David Murphy]

Out of interest what is to be gained by doing this conversion?
A Leica with a Pentax lens is no different to using a Pentax Body with this lens.
I applaud you for the technical skills but photographically speaking it is a lot of work for no added benefit isn't it?
Surely the easiest thing to do is to buy a cheap slr body to use an slr lens with.

The advantage is that it fits an M mount rangefinder body - and all well touted advantages that has. And besides, this is real cool and challenging - just what many of us adore in the rangefinder universe.

 

[raid]

Why use a Leica RF camera when you could use an S L R? This is RFF after all!

 

[ChrisN]

I think the price of Pentax 50/1.2 lenses just climbed another notch!

Well done - do share the results please.

I already have one 🙂

So do I. 🙂