I don't even know what the LUG forum is. But my memory isn't what it used to be, either.
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Ah, yes. I think I participated there when I still had M cameras.
Joseph S Wisniewski
Forum Pro
Dr. Reid will be most disappointed to find out he's "long gone". It's bad enough what Google did to him.
Lenses Und Grandfathers, lol.
It's not at all "long gone". Brian Reid set it up on a MajorDomo list-server back in '92. He managed to port the message database from MajorDomo to MailMan in '03 years and it's still running today. Annual traffic is down to about 1/3 of what it was at its peak, and that peak was in 2013.
Seriously, if you're not on, you can sign up.
And if you search the archives, you'll see that I'm probably the only person to ever post shots with Leitz Photars there.
Because I'm everywhere. I exist forever, in the wind!
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leica-users.org
Joseph S Wisniewski
Forum Pro
I never had M cameras, except short term loans. (Lots of dentists and doctors lining up to stick their camera in my hands for a few weeks so I can get familiar enough with it to teach them how to work it).
But I posted a few shots taken with Nikon cameras and Leica lenses. I own a pair of Photars (50mm f/2.8, 25mm f/2.5) a Repro Summar, and 4 or 5 DIK objectives with Normanski prisms and dovetail mounts.
Aha, there’s hope for me yet.
C
CrispyBee
Guest
The big, fat, beautiful Pentax 67 bellows and all the adapters arrived.
This is fully extended with an additional 48mm extension tube, slightly beyond 3x, f4.2 (approx.)
GFX50S
no stack, single shot.
Cross-polarised crystals with LED lighting.
Suffice to say I'm pretty happy with the results.
there's a slight bloom on some frames...but honestly for +3x on a medium format sensor that's a mighty fine result. But it shows that while the resolution at 3x is alright for 50MP it won't be enough to resolve a 100MP sensor.
I'm just saying this to temper expectations, it's a fantastic lens but can't overcome physics and optical limits.
EDIT: I just measured 11mm FOV horizontal. So that's actually 4x magnification. Whoops. Those adapters really add some length. +500mm total extension.
--
Professional naysayer. Occasionally.
This is fully extended with an additional 48mm extension tube, slightly beyond 3x, f4.2 (approx.)
GFX50S
no stack, single shot.
Cross-polarised crystals with LED lighting.
Suffice to say I'm pretty happy with the results.
there's a slight bloom on some frames...but honestly for +3x on a medium format sensor that's a mighty fine result. But it shows that while the resolution at 3x is alright for 50MP it won't be enough to resolve a 100MP sensor.
I'm just saying this to temper expectations, it's a fantastic lens but can't overcome physics and optical limits.
EDIT: I just measured 11mm FOV horizontal. So that's actually 4x magnification. Whoops. Those adapters really add some length. +500mm total extension.
--
Professional naysayer. Occasionally.
Last edited:
C
CrispyBee
Guest
CA's are well corrected, very well considering this is far beyond the range of its intended use!
F4.0 (!)
approx. 4x.
--
Professional naysayer. Occasionally.
Great to know, Joseph! Now I remember you posting there, always with humor and wit. Since I announced their early demise, I’ll be sure to check in and see what’s going on at the LUG.
Really impressed with your efforts and the performance of the lens. Big props all around.The big, fat, beautiful Pentax 67 bellows and all the adapters arrived.
This is fully extended with an additional 48mm extension tube, slightly beyond 3x, f4.2 (approx.)
GFX50S
no stack, single shot.
Cross-polarised crystals with LED lighting.
Suffice to say I'm pretty happy with the results.
there's a slight bloom on some frames...but honestly for +3x on a medium format sensor that's a mighty fine result. But it shows that while the resolution at 3x is alright for 50MP it won't be enough to resolve a 100MP sensor.
I'm just saying this to temper expectations, it's a fantastic lens but can't overcome physics and optical limits.
EDIT: I just measured 11mm FOV horizontal. So that's actually 4x magnification. Whoops. Those adapters really add some length. +500mm total extension.
C
CrispyBee
Guest
I've recently had the chance to compare two additional Mejiro FL0530 with both of mine.
While the performance is absolutely identical (they're all stellar) I also noticed that the magnification ring is also not correctly set and requires adjustment.
I'm pretty sure by now that it's because these lenses were designed for line scanner sensors, not "our" camera sensors with their rather thick sensor glass. Most likely the sensor glass causes a slight shift in focus, just like a polariser filter will due to the additional layer of glass.
So if you want to get the best performance with theses lenses the mag ring has to be adjusted, otherwise the edges and corners will not deliver the best possible image quality right out of the box.
--
Professional naysayer. Occasionally.
While the performance is absolutely identical (they're all stellar) I also noticed that the magnification ring is also not correctly set and requires adjustment.
I'm pretty sure by now that it's because these lenses were designed for line scanner sensors, not "our" camera sensors with their rather thick sensor glass. Most likely the sensor glass causes a slight shift in focus, just like a polariser filter will due to the additional layer of glass.
So if you want to get the best performance with theses lenses the mag ring has to be adjusted, otherwise the edges and corners will not deliver the best possible image quality right out of the box.
--
Professional naysayer. Occasionally.
Last edited:
dbateman
Senior Member
C
CrispyBee
Guest
Yes, I'd say it was the same amount, I didn't measure the exact degree of required repositioning but it was pretty much the same.
dbateman
Senior Member
I scanned my copy of this lens today. If anyone is interested the cut off is at 363nm. So can be used for UVA imaging. If you want to use it for UV induced luminescence (fluorescence), you will need a UV blocking filter that actually blocks UV.
I haven't used it yet for UV photography, so can't report on sharpness yet.
I haven't used it yet for UV photography, so can't report on sharpness yet.
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CrispyBee
Guest
That's pretty awesome and makes total sense as an industrial line scanner lens is often used for UV inspection as part of NDT (nondestructive-testing) .
Mejiro Genossen also specifically talks about using these lenses for infrared, ultraviolet or X-ray but they don't give a specific number when it comes to the actual transmission rates and cutoffs - thanks for testing that!!
https://www.genossen.co.jp/en/top-96-product83
Mejiro Genossen also specifically talks about using these lenses for infrared, ultraviolet or X-ray but they don't give a specific number when it comes to the actual transmission rates and cutoffs - thanks for testing that!!
https://www.genossen.co.jp/en/top-96-product83
Joseph S Wisniewski
Forum Pro
Excellent, but how are you defining "cutoff"? 50% transmission, 5% transmission? etc.
I do keep those around. B+W 415, specifically for fluorescence work. Smallest I have is a 52mm and a 52-49 step up. Also my 49mm lens hood has a 52mm thread on the front. Unfortunately, I believe that filter is now discontinued.
Well, please let us know when you do.
