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focal length extender for 20x


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#1 Jean-Louis Seguin

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Posted 08 January 2012 - 10:14 PM

Does anyone have any experience with using a 2x extender on a 20x zoom lens such as the Angenieux 12-120mm?
Is there a particular extender that works best with this zoom?

Thanks.

Jean-Louis

Edited by Jean-Louis Seguin, 08 January 2012 - 10:15 PM.

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#2 Brian Drysdale

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Posted 10 January 2012 - 05:35 AM

Do you mean the 12-240 or is the 20x a typo?

I've used a Colcine X2 extender on a Zeiss 10-100 T3 and it was ok as long as it was stopped down. Basically, it got the shots.
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#3 Jean-Louis Seguin

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Posted 10 January 2012 - 06:30 PM

I'm sorry for the confusion, it's my typo in the text.

It is the 12-240mm I'm talking about.

Cheers,
Jean-Louis
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#4 Dom Jaeger

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Posted 10 January 2012 - 06:53 PM

Hi Jean-Louis,

the Optex 2x extender for Bayonet mount has an optic that hits the rear of the 12-240 so it's no good.

I tested a Zeiss Mutar 2X (Bayo mount for 10-100) and it fits the 12-240, with no vignetting through the range.

You lose I think 2 stops, and wide open doesn't look so great, so realistically you're looking at a min of about T11! But it works.
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#5 Jean-Louis Seguin

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Posted 10 January 2012 - 10:40 PM

Hi Jean-Louis,

the Optex 2x extender for Bayonet mount has an optic that hits the rear of the 12-240 so it's no good.

I tested a Zeiss Mutar 2X (Bayo mount for 10-100) and it fits the 12-240, with no vignetting through the range.

You lose I think 2 stops, and wide open doesn't look so great, so realistically you're looking at a min of about T11! But it works.




Many thanks Don. I'll check out the Mutar.

Cheers,
Jean-Louis
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#6 John Jaquish

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Posted 09 January 2014 - 09:50 AM



Many thanks Don. I'll check out the Mutar.

Cheers,
Jean-Louis

 

Jean-Louis, did you end up testing the Mutar? If so, can I ask what camera you were using? Thanks!


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#7 Adriano Cimino

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Posted 17 January 2014 - 05:26 AM

Hello, on the same issue, I have  a question about this accessory:

 

http://www.ebay.it/i...=item2ecdb33461

 

is this another focal extender? does anybody have experience with this, so to tell if could it be used with Schneider old primes (cinegon 10 and 16, cine-xenon 25) with a protruding back? generally, is the image obtained with a combination of a prime lens and a converter better than an image obtained with a zoom lens?

Thank you for any help.


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#8 Dom Jaeger

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Posted 17 January 2014 - 08:35 AM

Yes that looks to be a 2x extender, but I doubt it will work with the wide Schneiders you mention due to how far back they protrude. You could ask the seller to measure the distance from the front mounting surface to the first optic inside (carefully!) and then work out if a particular lens will fit.

 

Most of these older extenders were made to extend already long lenses even further, a cheaper way to get extreme telephotos. Since long focal lengths don't need to protrude behind the mount, the extenders usually have very little room to accommodate a protruding rear. This one is possibly made by Astro Berlin, who specialised in top class telephoto lenses.

 

A doubler on a 16mm Schneider for example would only make a rather slow 32mm, certainly worse than a comparable focal length prime and I would hazard to guess no better than most zooms.


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#9 Adriano Cimino

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Posted 18 January 2014 - 06:29 AM

Thank you for the tip. I sent an email to the seller, if he can measure it for me.


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#10 Jean-Louis Seguin

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Posted 18 January 2014 - 10:32 PM

 

Jean-Louis, did you end up testing the Mutar? If so, can I ask what camera you were using? Thanks!

 

 

Sadly no, I was never able to get my hands on a Mutar.

 

JL


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#11 Adriano Cimino

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Posted 20 January 2014 - 11:53 AM


A doubler on a 16mm Schneider for example would only make a rather slow 32mm, certainly worse than a comparable focal length prime and I would hazard to guess no better than most zooms.

 

The seller assured he tried with a Xenon 16mm and it fits, the deepness being aroud 35 mm.

My aim is to have a discrete variety of focal lenghts, to cut with old Schneider primes' look. For keeping it cheap, I thougt to double some of them with the extender. Frankly, do you think is this latter the better solution, or to use some - adapted - Minolta Rokkor lenses instead?

(please excuse me for bouncing into the main discussion!)


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