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Topcon RE Auto Topcor 1.8/58 wide open sharpness
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PostPosted: Sat Sep 28, 2013 10:35 am    Post subject: Reply with quote
Impressive results, I really like the rendering. Can someone tell me more about the Topcon brand? Which company made these lenses? Were they highly regarded/rare/premium items? And most important: is it possible to mount them on Canon cameras without problems? Smile


PostPosted: Sat Sep 28, 2013 1:02 pm    Post subject: Reply with quote
my first fully open pic with 1.8/5,8cm Topcor RE.Auto



PostPosted: Sun Sep 29, 2013 5:37 am    Post subject: Reply with quote
Mark wrote:
Impressive results, I really like the rendering. Can someone tell me more about the Topcon brand? Which company made these lenses? Were they highly regarded/rare/premium items? And most important: is it possible to mount them on Canon cameras without problems? Smile

Topcon makes them(but not the zooms)they left photography to pursue medical and surveying markets, which makes me sad, as the optics are of very high quality, many consider them to be equals of Leica, including me, their only weakness is flare resistance and CA, though some lenses are better than others.
They use a variation of the Exacta mount which has a larger registration distance, so they do mount on Canon, there could be mirror issues on FF with wider lenses.
http://camerapedia.wikia.com/wiki/Tōkyō_Kōgaku
http://www.topcon.co.jp/en/corporate/history/
http://en.wikipedia.org/wiki/Topcon


PostPosted: Sun Sep 29, 2013 6:30 am    Post subject: Reply with quote
Lightshow wrote:
Sorry you have to eat scraps of food to be able to afford all the lenses we keep tempting you with, the bright side is once you have a good set of lenses, the temptation to buy more does go down, unless you're addicted, in which case, welcome to the club. Twisted Evil

mflenses.com weightloss program Laughing


PostPosted: Sun Sep 29, 2013 1:20 pm    Post subject: Reply with quote
Lightshow wrote:
Mark wrote:
Impressive results, I really like the rendering. Can someone tell me more about the Topcon brand? Which company made these lenses? Were they highly regarded/rare/premium items? And most important: is it possible to mount them on Canon cameras without problems? Smile

Topcon makes them(but not the zooms)they left photography to pursue medical and surveying markets, which makes me sad, as the optics are of very high quality, many consider them to be equals of Leica, including me, their only weakness is flare resistance and CA, though some lenses are better than others.
They use a variation of the Exacta mount which has a larger registration distance, so they do mount on Canon, there could be mirror issues on FF with wider lenses.
http://camerapedia.wikia.com/wiki/Tōkyō_Kōgaku
http://www.topcon.co.jp/en/corporate/history/
http://en.wikipedia.org/wiki/Topcon


Thanks for the information, I'll check the links!


PostPosted: Sun Sep 29, 2013 1:46 pm    Post subject: Reply with quote
Lightshow wrote:

... as the optics are of very high quality, many consider them to be equals of Leica, including me ....


I think my Topcor 2,8/35mm is equal or slightly better than to my 2/35mm Contax G


PostPosted: Tue Oct 01, 2013 12:02 pm    Post subject: Reply with quote
Thx for the comparisons !
Which of the you keep, if you must let go of one ? And why ? (please do not consider the value)


PostPosted: Sun Oct 06, 2013 11:10 pm    Post subject: Chrome versus black nose on black Topcors Reply with quote
The early black lenses still had the chrome-plated brass filter rings, just like the satin-finish aluminum lenses. Black lenses were an unusual option for Topcon then.

When Topcon shifted to only making black lenses in the early 1970's (and only black Super Dm cameras as well), they shifted the filter rings to black anodized aluminum like the rest of the lens body. All of these black-nose lenses have the lettering on the beauty ring in all-CAPS, with TOPCON in double-width letters. (Some lenses shipped with those all-caps rings earlier, like the 20/4 and 28/2.8.)

Brass is a better material for filter rings, much less chance of the threads freezing. But chrome-plated brass filter rings do provide a potential source of lens flare and specular reflections, which is probably one thing that made them switch to anodized aluminum.

Some of the later black-nose lenses also have a reduction in the number of parts, the whole front of the lens is one piece (all-aluminum) rather than two pieces (one chromed brass, one aluminum). So it probably reduced cost as well.

These changes were independent in changes in the optical design, which apparently really only happened on the 58/1.8 and 58/1.4 lenses.
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