Komura 2x extender for M.

[gyoung]

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When I had one the Komura ltm to m adapter seemed to have problems holding a lens and converter tight to the body, couldnt understand why focus on the transparency was sometimes well in front of where I focused. A leica adapter improved matters but ideally you need to support both camera and lens carefully to avoid droop.

 

Gerry

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[jaapv]

Ah, my mistake.

Thanks for the reply.

I did mean the LTM adapter on the rear of the Komura itself to allow mounting on an M body.

The Komura LTM adapter that came with mine has the large cutout and when i last tried it the M could not see any lens mounted.

Are you focusing via an EVF or Rangefinder?

That has been fixed with the latest firmware.

[jmahto]

If there can be a macro adapter to 90mm lens to be used via EVF then why not a 2x APO converter? 

 

Imagine a tiny 2x converter + tiny collapsible 90mm macro-elmar !! A traveller's dream.

[m11user]

KIPON released a 2x Teleconverter recently. Has anyone tested it yet? Would love to see how it performs before I buy one. 

Link: KIPON 2x Teleconverter

Edited December 4, 2024 by m11user

[farnz]

10 hours ago, m11user said:

KIPON released a 2x Teleconverter recently. Has anyone tested it yet? Would love to see how it performs before I buy one. 

Link: KIPON 2x Teleconverter

For £700 I think I'll just crop in post-production instead and save my money, the two stops exposure penalty, and the extra weight and length.

Pete.

[J S H]

Looks well made...I'd love to see a review. 

[roydonian]

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To judge from the product pics, the Kipon does not have a rangefinder-coupling mechanism. The Komura extender did, but its coupling mechanism lacked the necessary precision, so was near-useless.

Edited December 5, 2024 by roydonian

[luigi bertolotti]

10 hours ago, farnz said:

For £700 I think I'll just crop in post-production instead and save my money, the two stops exposure penalty, and the extra weight and length.

Pete.

Same feel on my side... 😉.. but I anyway would like to see some review (or even better some examples in this forum 😉)

a 7 elements design is a lot of glass : the design can be smart.. and someway appreciate they do not advertise it as an APO device... 

[J S H]

16 hours ago, roydonian said:

To judge from the product pics, the Kipon does not have a rangefinder-coupling mechanism. The Komura extender did, but its coupling mechanism lacked the necessary precision, so was near-useless.

I don’t think rangefinder coupling is needed. The Kipon extender linked above is designed for use with telephoto lenses 75mm and up. It would be an EVF only proposition, since the frame lines would no longer be accurate. 

[luigi bertolotti]

4 hours ago, J S H said:

I don’t think rangefinder coupling is needed. 

Correct : it would add a lot of cost if well made... and at that point, by logic, you should also add a goggle unit (managing framelines too..) making it a sort of bigger Elmar 90 Macro-M adapterV1  (a device I like and use) : costly, bulky, unsellable . 

Just to chat... I'd be curios to know how many AT 135 are meanly sold nowadays... long focals look no so desired by M users... and me,  still loving to use "over 90", still think that if Voigtlander would make a 180 in the range of f 5,6, RF coupled and goggled, a bit smaller than TE 135 2,8, I'd buy it at once... 😎

 

Edited December 6, 2024 by luigi bertolotti

[farnz]

2 hours ago, luigi bertolotti said:

Correct : it would add a lot of cost if well made... and at that point, by logic, you should also add a goggle unit (managing framelines too..) making it a sort of bigger Elmar 90 Macro-M adapterV1  (a device I like and use) : costly, bulky, unsellable . 

It would probably be similar to the 135/2.8 Elmarit which had built-in goggles.  The lens never seemed to gain much popularity and became a curio or gimmick lens for many people owing to its size and weight.

Pete.

[jaapv]

23 hours ago, roydonian said:

To judge from the product pics, the Kipon does not have a rangefinder-coupling mechanism. The Komura extender did, but its coupling mechanism lacked the necessary precision, so was near-useless.

In my experience it works as it should. Maybe yours was worn. 

[jaapv]

7 hours ago, J S H said:

I don’t think rangefinder coupling is needed. The Kipon extender linked above is designed for use with telephoto lenses 75mm and up. It would be an EVF only proposition, since the frame lines would no longer be accurate. 

That is why Komura added an  excellent viewfinder. 

[roydonian]

I've looked at several types of X2 rangefinder-coupled extender, and One Day Real Soon Now will finish an article on the subject that I've promised to 'Viewfinder'. I compared the results from the Komura with those created by cropping and resizing, and found that the latter technique gave the better result – an outcome predicted by a 1970s photo book published around the time that the  Komura was being marketed. Alas, I was not able to try the rangefinder-coupled X1.4 extender that Leitz developed during the early 1970s but did not commit to production.

The big problem with the Komura was that the coupling device had been painted, so its dimensional accuracy changed as the paint wore off. While Wetzlar applied a tolerance of a tiny fraction of a millimetre to its coupling mechanism, Komura had introduced a variable parameter - the thickness of a coat of paint that it practice would soon wear off. 

 

[roydonian]

The last sentence of my previous post should have read "- the thickness of a coat of paint that in practice would soon wear off."

I was surprised when Jaapv said that Komura had supplied "an  excellent viewfinder".  Although it is of the 'bright-line' type, the examples I have seen could be more accurately described as 'dim-line' finders whose adjustable frame can only be seen in decent lighting conditions.

 

[KFo]

On 5/13/2014 at 11:51 PM, jaapv said:

One can always use the Apo-Telyt R 180/3.4 and the Apo-Extender R 2x.

I have this exact combo.  Impossible to handhold because it requires LV (no evf here).  I concluded that using the 180 and cropping was just good.  I seem to remember spending about 1000€ with the R-M adapter

Edited December 11, 2024 by KFo

[jaapv]

On 12/7/2024 at 7:10 PM, roydonian said:

The last sentence of my previous post should have read "- the thickness of a coat of paint that in practice would soon wear off."

I was surprised when Jaapv said that Komura had supplied "an  excellent viewfinder".  Although it is of the 'bright-line' type, the examples I have seen could be more accurately described as 'dim-line' finders whose adjustable frame can only be seen in decent lighting conditions.

 

Some seem to age better than others. Mine is fine in brighter light - which one would prefer for accurate focus and handholding anyway.

[jaapv]

On 12/6/2024 at 1:54 PM, roydonian said:

I compared the results from the Komura with those created by cropping and resizing, and found that the latter technique gave the better result

If you read my "review" I came to the same conclusion

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Hallo,

Look here: Leica M

[jaapv]

On 12/6/2024 at 1:54 PM, roydonian said:

The big problem with the Komura was that the coupling device had been painted, so its dimensional accuracy changed as the paint wore off

In my case the paint is exceedingly thin and only minimally worn - I found that it was possible to focus with adequate precision given time... It is not simple to do so, but it can be done. EVF work should be a lot better.

[Sumie]

Sorry in advance for potential necroposting.

I wonder if this extender works for wider lens, say, 50mm primes or wide-angle primes? I see a 40 and 50 master mark on the viewfinder gadget.

Not expecting image qualities, if focusing is possible within EVF and no black corner appears it should be fine for me.

This seems to be one of the few 3rd party extenders(teleconverters?) available for mirrorless systems.