Karl Gener 85-205mm lens?

[tinybynature]

Need some help with a lens.

Karl Gener - Auto Zoom 1:3.8 F=85-205mm SN#151169

What confuses me about this lens, is that there is no push/pull way to zoom in and out. The focusing works fine, but I can't figure out how to change the focal length???

Isn't it normal for a zoom lens, to have an aperture range listed? For example 3.8 - 5.6 (max aperture for both extremes of the focal length)? This one only has one listed.

I will post some photos later.

Any help, greatly appreciated.

Thanks.

[kds315*]

I have adjusted the title to make clear for readers what it is about...

[martinsmith99]

There were a few rebadged Kiron lenses. I have one, but I can't remember how to zoom; I thought it had a 2 touch setup.

[buerokratiehasser]

85-205 sounds familiar maybe rebrand?

Some lenses have constant aperture through everything - often higher quality ones (it's more difficult to make them unless capping a 4-5.6 to 5.6 of course)

I believe you are doing it worng is there no scale for 85 .. 205? you may have one of the Sun/Sigma with double touch, I never had one of these, but as a rule all zooms can change focal length.. unless you got the Minolta Monster Macro whose focal length is hardlocked on focusing.

[Lightshow]

Some pictures may help us help you.

[Minolfan]

I presume it is the same lens as the Panagor 80-205mm 3.8 from Kiron.
That is a lens with two rings, one for focussing, the other for focus length.

[luisalegria]

Ditto, sounds like the Kiron two-touch. Was sold in a large number of brands and styles.

One of the rings should change focal length. This is a constant-aperture lens.

[tinybynature]

Thank you all for the responses. I have posted some pics. There appears to have been a way (below the green numbers - focal lengths), to turn and adjust this. The focusing helicoid, is further down the lens. Is there a trick to get that focal length adjustment to turn, or is mine maybe just stuck at 205mm? It was passed down from my dad, so I am not out any money and I do not have a long lens, so being stuck at 205mm may not be that bad a thing.

What does it mean that the "aperture is the same right through all the focal pts? I have looked that up and it appears to only be present on better quality lenses, so I guess this is a good thing?

Thanks again, for all the responses and help

[luisalegria]

Yes, this is the Kiron two-touch.
You should be able to turn the ring with the marked focal lengths. It should turn easily. If it doesn't turn there is something wrong with it.

There were quite a few constant-aperture zooms. This is not necessarily a mark of high quality as some, like this one, were quite common and affordable. This is in fact a very decent lens for its time.

[tinybynature]

[martinsmith99]

If you're in the UK, you can have mine as I don't use it.

[MTHall]

Try warming the lens over a radiator for a few hours, then when it is thoroughly warmed, try a little muscle, holding it by the focus and zoom rings, applying force in alternate directions. It might shift it, the alternative is a dismantling and rebuild? It looks quite tidy in the photos, so I'd assume it hasn't been damaged, in which case the lube has solidified into glue. A clue would be how `nice' the focus works, maybe. If something has broken, there might be an unusual rattle (give it a shake). But I'd go for the glue effect. LOL.