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sigma image extender
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PostPosted: Tue May 11, 2021 7:04 pm    Post subject: sigma image extender Reply with quote
Hi there,

I am looking for info of the Sigma Image Extender form the period 1961 - 1969.

With this extender you can use 35mm (film) lenses on 6x6 camera's.

Thanks in advance, pinkf


PostPosted: Tue May 11, 2021 7:49 pm    Post subject: Reply with quote
I have never heard of such a product from Sigma and from that time frame. Do you own one or have you seen one you may purchase? Some photos or further description might be helpful. What cameras was it for?


PostPosted: Tue May 11, 2021 8:39 pm    Post subject: Re: sigma image extender Reply with quote
pinkf wrote:
Hi there,

I am looking for info of the Sigma Image Extender form the period 1961 - 1969.

With this extender you can use 35mm (film) lenses on 6x6 camera's.

Thanks in advance, pinkf

I've not heard of such a product but have often thought a teleconverter would increase the image circle, & have used a c-mount model for just that. I guess it would effectively be a 6x6 teleconverter (between 2x & 3x in power) with the 35mm mount adapter on the front.

A similar approach might simply be to use a 1.7x or 2x (FF) TC to get APSC lenses to cover FF - easily done if the TC is a film model. Note APSC teleconverters probably won't work as they'll have baffles designed to reduce what would otherwise be stray light.

Last edited by DConvert on Wed May 12, 2021 6:57 am; edited 1 time in total


PostPosted: Wed May 12, 2021 5:39 am    Post subject: Reply with quote
In the past I read somewhere on the internet: the sigma image extender expands the image circle of the 35mm lens allowing to be used on an 6x6 camera body.
But I could not find this info again.

So my question for more info.

The image extender is also mentioned on the sigma history page.
Look at https://www.sigma-imaging-uk.com/lounge/sigma-history-1961-2010

gr. from pinkf


PostPosted: Wed May 12, 2021 6:49 am    Post subject: Reply with quote
Extender == Teleconverter


PostPosted: Wed May 12, 2021 7:47 am    Post subject: Reply with quote
The opposite of a speed booster.


PostPosted: Wed May 12, 2021 9:00 am    Post subject: Re: sigma image extender Reply with quote
pinkf wrote:
Hi there,

I am looking for info of the Sigma Image Extender form the period 1961 - 1969.

With this extender you can use 35mm (film) lenses on 6x6 camera's.

Thanks in advance, pinkf

There's some information and a picture from a Photokina 1970 preview here:

https://www.flickr.com/photos/38552878@N02/50542591487/in/photostream/


PostPosted: Wed May 12, 2021 10:50 am    Post subject: Re: sigma image extender Reply with quote
heritagecameras wrote:

There's some information and a picture from a Photokina 1970 preview here:

https://www.flickr.com/photos/38552878@N02/50542591487/in/photostream/


Never Never heard of it .. Did it came to production ? anyway the quality was certainly very very poor (3x converter quality + sigma quality of that period) ..Perhaps was it the reason which explained why it was not really sold (or never went into production)

On the same page, you have info for a 36/105 zoom which NEVER went into production (the prototype of the well known 39/80 ?)

In the same mood , sigma introduced at Photokina in ~1985 a interchangeable mount system for af lenses which ,of course, never went into production


PostPosted: Wed May 12, 2021 6:22 pm    Post subject: Re: sigma image extender Reply with quote
PBFACTS wrote:
heritagecameras wrote:

There's some information and a picture from a Photokina 1970 preview here:

https://www.flickr.com/photos/38552878@N02/50542591487/in/photostream/

Never Never heard of it .. Did it came to production ? anyway the quality was certainly very very poor (3x converter quality + sigma quality of that period) ..Perhaps was it the reason which explained why it was not really sold (or never went into production)

On the same page, you have info for a 36/105 zoom which NEVER went into production (the prototype of the well known 39/80 ?)

In the same mood , sigma introduced at Photokina in ~1985 a interchangeable mount system for af lenses which ,of course, never went into production

Yes, at least some of these converters were produced, and though we've never had one I have seen a couple in the wild (online). They may have been prototypes, of course. I've also seen a couple of mentions of the zoom previously, but I can't imagine it would have been much good!

I also remember seeing a picture of the Sigma interchangeable-mount AF system at the time, though as I can't find any mention of it online now I was beginning to think I'd dreamt it. Presumably it made sense as all the early AF SLRs (Minolta, Nikon, Olympus, Pentax, Yashica) used a variation on the same screw-drive auto focus, electronically controlled but mechanically triggered diaphragm system. Once Canon threw a spanner in the works with its all-electronic EOS system the removable mount concept would have been much more complex.


PostPosted: Fri May 14, 2021 12:04 pm    Post subject: Re: sigma image extender Reply with quote
PBFACTS wrote:
heritagecameras wrote:

There's some information and a picture from a Photokina 1970 preview here:

https://www.flickr.com/photos/38552878@N02/50542591487/in/photostream/



Do you have also (preview) info of Photokina 1972, with the launch of the Olympus M1 camera?


PostPosted: Fri May 14, 2021 3:47 pm    Post subject: Re: sigma image extender Reply with quote
heritagecameras wrote:
pinkf wrote:
Hi there,

I am looking for info of the Sigma Image Extender form the period 1961 - 1969.

With this extender you can use 35mm (film) lenses on 6x6 camera's.

Thanks in advance, pinkf

There's some information and a picture from a Photokina 1970 preview here:

https://www.flickr.com/photos/38552878@N02/50542591487/in/photostream/


Super fascinating! While my gut had said "Is this person certain about what they are asking?" my experience has caused me never to write anything off. Amazing how many obscure lenses and photo-related there are out there. I agree with another member that the performance had to have been pretty bad. But now I am curious nonetheless!
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