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jeongyun
13-Feb-2009, 11:26
My copy of coated Zeiss Jena Tessar 135mm seems to be much more prone to flare than Kodak Ektar 127mm.

Is this normal with this Jena Tessar?

Zeiss Jena Tessar 135mm f/4.5
http://farm4.static.flickr.com/3346/3275407927_e35458f5f2_m.jpg (http://flickr.com/photos/jeongyun/3275407927/in/set-72157611878510605/) http://farm4.static.flickr.com/3267/3155641912_9bea486087_m.jpg (http://flickr.com/photos/jeongyun/3155641912/in/set-72157611878510605/)

Kodak Ektar 127mm f/4.7
http://farm4.static.flickr.com/3497/3180943545_694a4bf777_m.jpg (http://flickr.com/photos/jeongyun/3180943545/in/set-72157611878510605/) http://farm4.static.flickr.com/3328/3193669150_670177effb_m.jpg (http://flickr.com/photos/jeongyun/3193669150/in/set-72157611878510605/)

IanG
13-Feb-2009, 11:32
What's the age of the Tessar, the coating on my 150mm CZ Jena Tessar from 52/4 is good.

Ian

GPS
13-Feb-2009, 12:25
My copy of coated Zeiss Jena Tessar 135mm seems to be much more prone to flare than Kodak Ektar 127mm.

Is this normal with this Jena Tessar?

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To make your comparison meaningful you would need to take the exactly same pictures with both lenses. Otherwise you're comparing your knifes on apples and oranges.

venchka
13-Feb-2009, 13:09
What GPS said.

Thanks for convincing me to use my 127mm Ektar. It has been neglected too long.

Ken Lee
13-Feb-2009, 13:19
At first I thought this was intended as a light-hearted parody of lens testing.

To make a convincing test that will help other photographers, we need to see the same scene, at the same time, with the same film, shutter speed, f/stop, processing, scanning, etc. The photo should be taken with the camera on a tripod.

venchka
13-Feb-2009, 13:41
I would add that more normal exposure times would be better. It shouldn't be too hard to find some bright sources to include in the frame and around the frame. I find that I get the worst lens flare when the sun is between 10 o'clock and 2 o'clock and just outside (above) the frame of the camera. That would be 10 to 2 relative to teh camera axis, not time of day.

Looking at your very good photos, I think the only difference is overexposure (not flare) of the light sources in the Tessar photos.

Bernard Kaye
18-Feb-2009, 13:36
I am late here but agree with Ken Lee, GPS & others: it has to be "same picture." It is to me obvious that the Tessar pics will have more hot spot flare than the Ektar pics (pictures not the same and weighted in favor of Ektar) though both lenses can be superb in situations designed for.
One of the Ektar pics is almost without hot spot flare.
Years ago, we ran properly set-up shots in B & W of normal range, (for 35mm, 45-55mm lenses.) night, street lamp shots with Leitz, Zeiss, Canon, Pentax, & other makes which confirmed professional photographers ability to walk past 5 x 7" blow-ups of difficult shadow/high contrast pics and pin-point the Zeiss, Leica & Canon pics which always had greatest shadow detail and least flare.
Same for the night shots, Leitz, Zeiss & Canon on top with Leitz sometimes ahead on shadow detail but Zeiss had the color saturation along with Retina equipped with Schneider Xenon or Rodenstock lenses made for Retina.
Nikon was in minor leagues as it was with enlarging lenses which was easily proven to professional photographers by lending them Rodenstock enlarging lenses.

Someone on Forum asked how you can wear-out an enlarging lens, here's how: leave it on the enlarger or a shelf in the dark room, never inspect it for drip or splash and never, never leave it the sun to let ultraviolet light kill fungus; it will go to seed.
Bernie Kaye