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  #1  
Old 15th October 2017
Harold Gough Harold Gough is offline
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Manual Focus Website Defunct?

http://forum.manualfocus.org/

I have been unable to access the site for a couple of weeks or so. Whether via my desktop shotcut or by a google search, I got the same error message about a password error.

Does anyone know what happened or if it is likely to be reinstated?

Harold
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Old 15th October 2017
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Re: Manual Focus Website Defunct?

I have the site bookmarked but hadn't visited for some time. I can't access it either.

mflenses is still up, another site I bookmarked but not visited for a while.

http://forum.mflenses.com

Neither site seemed as busy as they were a few years ago. I suspect that the ability to rotate a focusing ring is something humans are evolving out of. Thumbs are purely for texting these days.
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Old 15th October 2017
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Re: Manual Focus Website Defunct?

I checked the site data; the domain name is active and is registered (and has been registered) by the owner fort some time.

The question is whether or not the owner is maintaining it any more.

Ian
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Old 15th October 2017
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Re: Manual Focus Website Defunct?

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Originally Posted by Ian View Post
The question is whether or not the owner is maintaining it any more.

Ian
That's what I was thinking.
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Old 15th October 2017
Petrochemist Petrochemist is offline
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Re: Manual Focus Website Defunct?

I was going to say I was on it only yesterday - then found yours is another manual focus site. The one I know has already been mentioned: http://www.mflenses.com/
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Old 15th October 2017
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Re: Manual Focus Website Defunct?

Interesting, I just read on the MFLenses forums that the EBC Fujinon 600mm f/5.6 I had was radioactive.
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Old 16th October 2017
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Re: Manual Focus Website Defunct?

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Originally Posted by David M View Post
Interesting, I just read on the MFLenses forums that the EBC Fujinon 600mm f/5.6 I had was radioactive.
So are Cornwall, bananas & brazil nuts to name just a few.
Low level radioactivity isn't too much of a concern as long as you're not stupid with it. Radioactive glass for viewfinders is not a good idea - but on the other side of the camera it's not a problem.
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Old 16th October 2017
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Re: Manual Focus Website Defunct?

Quite a few old lenses had high density glass made using materials that were mildly radioactive - Pentax and Olympus come to mind.

Sometimes these caused the glue binding lens elements into groups to yellow with age.

Ian
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Old 16th October 2017
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Re: Manual Focus Website Defunct?

Quote:
Originally Posted by Petrochemist View Post
So are Cornwall, bananas & brazil nuts to name just a few.
Low level radioactivity isn't too much of a concern as long as you're not stupid with it. Radioactive glass for viewfinders is not a good idea - but on the other side of the camera it's not a problem.
My surprise was because most radioactive elements seem to be in standard and wide angle lenses. I don't remember coming across one in such a long lens before.
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Old 16th October 2017
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Re: Manual Focus Website Defunct?

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My surprise was because most radioactive elements seem to be in standard and wide angle lenses. I don't remember coming across one in such a long lens before.
Good point! I haven't either.
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Old 16th October 2017
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Re: Manual Focus Website Defunct?

Quote:
Originally Posted by Petrochemist View Post
So are Cornwall, bananas & brazil nuts to name just a few.
Low level radioactivity isn't too much of a concern as long as you're not stupid with it. Radioactive glass for viewfinders is not a good idea - but on the other side of the camera it's not a problem.
I have a dashboard clock (Junghans J30BZ chrono) out of a WW2 German fighter, dated Jan 1945 (so probably an Me262). After all those years, the Radium luminous compound on the dial still glows beautifully. That's probably why I've developed a twitch - not the caffeine in my coffee after all ! (Warplanes didn't last long then, so it didn't matter, I guess.)
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Old 16th October 2017
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Re: Manual Focus Website Defunct?

Quote:
Originally Posted by Ian View Post
Quite a few old lenses had high density glass made using materials that were mildly radioactive - Pentax and Olympus come to mind.

Sometimes these caused the glue binding lens elements into groups to yellow with age.

Ian
There was quite a few EBC Fujinon lenses on the list that included the 600mm. IIRC the 400mm f/4.5 was also on it.

The only OM Zuiko I remember was the 55mm f/1.2 although there could have been more. No one really bothered about the radioactivity until it became a talking point on the web.
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Old 16th October 2017
Jim Ford Jim Ford is offline
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Re: Manual Focus Website Defunct?

One of the lenses for my Fed uses lanthanum, which is radioactive.

As was mentioned earlier, bananas are said to be radioactive (an isotope of potassium), but I was unable to detect significant activity when I measured one with a Geiger counter when I worked at a school.

Jim
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