mpaniagua
Newby photographer
Not really. Panatomic was available then (asa32). That would be about f/2.8 at 1000th so about 500 ay f/1.4 on shadow. It was pretty different reality back then.
[New test photos released] Leica Summicron 35/2 Eight Element copy made in China
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Not really. Panatomic was available then (asa32). That would be about f/2.8 at 1000th so about 500 ay f/1.4 on shadow. It was pretty different reality back then.
teddy
Jose Morales
This is typical of a 35mm lens. I take this and use it to my advantage.
teddy
Jose Morales
It's a typical rendition of all 35mm lenses. Also, some photos have been cropped, so the angle of view has changed. Nothing to worry about guys.
retinax
Well-known
Huh, what exactly is a typical rendition of all 35mm lenses? Sharpness here doesn't simply fall off toward the corners. It comes back very near the extreme corner, before it falls off again. As I wrote before, of course it's nothing to be alarmed about, but unusual it is.
teddy
Jose Morales
Yes, this sharpness eveness from centre to the extreme corner before falling off steeply is a good description of a typical 35mm lens angle of view. I'm not referring to all lenses, just the 35mm angle of view - typical curvature of field of a 35mm angle of view. Also, the image was cropped. It also helps to see the Curvature of Field performance realting to sharpness evident in the MTF charts provided in the last couple of pages of this thread.
About the "mushiness" on the right side before the extreme corners - this looks like camera spin from hand held shooting. The right side of the hand as the shutter is pressed lobs the image to the right from camera shake.
Sorry, I'm writting this before I head off to work - but there's nothing to worry about these details, although they can be unusual at first glance.
retinax
Well-known
Teddy, please read again what you replied to. The image in question does not display what you describe. And camera spin wouldn't leave an area near the corner unaffected.
xasthur
Established
I wonder whatever happened to the 35mm external viewfinder?
raid
Dad Photographer
Kevin said that the finder could be ordered later on, I think.
D
Deleted member 65559
Guest
Xasthur, if i'm making the right assumption here, the Chinese New Year holiday was extended as a measure against the corona virus & has had an effect on the economy: https://www.cnbc.com/2020/02/08/cor...ufacturing-could-ripple-through-holidays.html
I'm guessing the early photos of the viewfinder are prototypes and not production models.
I'm guessing the early photos of the viewfinder are prototypes and not production models.
teddy
Jose Morales
Sure! I will have a read again.
teddy
Jose Morales
Hello retinax, I stand my ground regarding what I said, “The typical 35mm, the constitution, and that's it, it's the vibe of it. I rest my case... ...
Just kidding... Yeah, nah - you're most positively right. I can see a strange unsharp blob on the top right side of the image which could be dicentrering - I don't know. Not typical at all. Well spotted.
Could Kevin please have a look at the image ending *****780 that Ed has taken and perhaps ask the maker on a possible explanation. Kevin must be very busy lately - hope you are well.
Emile de Leon
Well-known
Probably a good idea to do some formal testing on tripod..
raid
Dad Photographer
This is a very important issue for maintaining the high confidence in this lens and the replica project.
I hope that Kevin is paying attention to it.
I hope that Kevin is paying attention to it.
Out to Lunch
Ventor
Wondering how this lens is reaching its customers...through RFF only? If not, rigorous testing would follow as a matter of course.
vincentbihler
Member
I am not sure there is any issue here. Look at the wide open MTF. There is some kinda drop of sharpness in the middle frame area. That is part of the design and apparently also present in the original 8 elts. The picture that show this defect with the tree has been shot at f2.5 or so. So I think it can be just this... To be confirmed.
retinax
Well-known
Yes, I've pointed this out in post 1597. People seem to want to disregard this... please, let's not panic.
raid
Dad Photographer
No panic here.
It seems to be a reasonable expectation to get feedback on this issue.
No panic 🙂
It seems to be a reasonable expectation to get feedback on this issue.
No panic 🙂
On the other hand, it seems to be a rather dramatic transition from sharp to blur. An MTF graph does not typically 'drop off the cliff' in that manner. Even if it were to do so, it would be present in all photos at the same f/stop.
raid
Dad Photographer
Do images from the original V1 35/2 Cron show same issue?
Ed Schwartzreic
Well-known
Well, just in time, here are 2 images from the original 8-element, again at f/8. While I do not see the issues raised with the prototype, I think the original lens is slightly less sharp.
Ed
L1003787 by woodswoman57, on Flickr
L1003786 by woodswoman57, on Flickr
Ed
L1003787 by woodswoman57, on FlickrL1003786 by woodswoman57, on FlickrSimilar threads
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