My specimen doesn't mind changing its speeds when open. The focusing opener seems to have no connection to the speed regulating mechanism.
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My specimen doesn't mind changing its speeds when open. The focusing opener seems to have no connection to the speed regulating mechanism.
My observations on the different Dagor generations are in this thread (mostly in these two posts, #16 and #24):
...
Good news.
It increases.
So your main concern would probably be to get a lens long enough (1) to be able to put the subject far enough to get nice perspective that does not deform face features and (2) to be...
With any lens, the maximum magnification is infinity - that's when the subject to the lens distance is equal to the lens focal length. It is the minimum magnification that is dependent on the lens...
I own the Apo-Tessars but sorry I do not understand your question....
The larger the magnification, the shorter a focal length is sufficient to cover the format. With an image twice bigger than life-size, a 600mm f/9 CZJ Apo-Tessar is enough to cover 40x50". But this...
It works fine with big scratches but I do not know a trick to make the ink get into the small ones.
There is no way to fill the micro scratches. Re-polishing is the only method to get rid of them. And as for the glass protection, one has to apply a really modern high-thech technology to apply a...
The idea came to me, too. But I am pretty sure such a cener-filter that can't be removed would make the ground glass too dim to see any image - to say nothing about focusing.
Yes indeed it is different.
And I don't know the results of using a center filter in front of a Hypergon either....
Thank you for your thorough explanation.
Please bear in mind I don't positively state it would not work; I just say I have serious doubts. Those are:-
(1) The surface reflection problem addressed by Mark J above (and that's one of the...
Yes that's the term Roosinov used to call his invention - both in his original papers and in his tutorials on optics (which I own and read from time to time but alas I'm not good enough in...
I also doubt it would work with a 135° lens that is not retrofocus nor is made according to the Roosinov's aberrational vignetting principle (like all the Biogons, Grandagons, etc., etc.). A...
Here is another vote for the 90mm f/6.8 Wollensak Raptar (also known as Graflex Optar). There was a significant time gap before I got the Raptar after using the 90mm Schneider Angulon so I've not...
Oh, and another point:-
A lot of MF folder shutters lack cable release sockets as the camera has its own shutter release system with the cable socket on the camera itself. On another camera, one...
I've recently bought several Moskva-5 folders to replace all the Seiko shutters in my MF lenses with the Moment-24C ones. Those are exact copies of the original rim-set Compur but are synchro, and...
And one the most prominent among the differences is that the soft lenses' spherical aberration increases the depth of field (that is not too important in small formats but vital in LF) while soft...
Yes this method has its valuе but definitely not as a replacement for soft-socus taking lens usage. In camera, a soft lens makes the bright highlights irradiate onto the dark areas which looks rather...
If my mostly used f-stops with a particular lens are going to be around f/16 to f/32, I'd better use a low-efficient shutter like the Copal with a round aperture to the highly efficient...
The format is irrelevant; its all the same with any cameras.
As for the different generations of Synchro-Compurs, I avoid the most recent ones as they have angular 5-blade apertures. All the older...
Why keep an outdated Swiss watch as opposed to a later Chinese one?
Why keep an old Stradivarius instead of getting a fresh-made violin?
...
Strictly speaking, your should measure the area of the aperture opening and compare it to the area of the corresponding circular aperture. In practice, a rough approximation is OK for an accurate...
They say (though I've never checked that myself) the original Apo-Sironar is the same as the 80° Apo-Sironar-W. So I'd verify it really covers 80° and go for the larger angle of view. I'd exchange...
I've never heard of it either but it is definitely a tessar, and the seller is completely wrong stating it is a wide angle, and the asking price is WAY above it's value.
F-stop numbers and corresponding round iris opening diameters for the 210mm f/9 G-Claron: -
f/11 = 15,4 mm
f/16 = 10,9 mm
f/22 = 7,7 mm
f/32 = 5,5 mm
f/45 = 3,85 mm
f/64 = 2,7 mm
I am glad to have a set of the #0 lens cells to #1 shutter adaptors made by Rodenstock. I do not use them yet but take care not to forget where I store them....
Bausch & Lomb was and is a reputable manufacturer. That's why they had the opportunity to buy that Zeiss patent. Zeiss did not sell any rights to manufacture their lenses to the firms that could...
As it is a double anastigmat, don't worry. The cells are corrected independently of each other, and you can safely use them in any combinations. Even the double anastigmat cells of different types...
• Any Componon or Rodagon for the best FOREGROUND out of focus rendering (wide open only).
For the better out of focus BACKGROUND rendering -
• An f/3.5 Tessar stopped down to f/4.5 or f/5.6. ...
Looks like the shutter was originally adapted for another lens with narrow cells that fit inside the plastic ring, not touching the ring front surface. The ring is not a spacer but a decorative /...
L2.
The difference you've noticed is most probably due to the lens' field curvature. Though I have not seen a noticeable field curvature in Symmars....
There are lots of factors diminishing sharpness beside the diffraction. The taking lens aberrations, the film + developer combo sharpness/resolution ability, the film flatness in the holder, the...
This was one of my very first posts on this forum: -
https://www.largeformatphotography.info/forum/showthread.php?68159-LONG-tube-for-a-Packard/page2
I don't think that matters at all. You could also just leave the oil there.
An update:-
I've now seen how a friend's Mamiya-7 electric shutters work, and they are not up to Compurs and Compounds in their efficiency either. They just move their blades more and more slowly at...
No that is not a mistake. Both the vignetting will be increased and the aperture will get smaller - if the aperture seen from the front of the lens is smaller than the lens opening without that...
I am afraid there is not enough data for the calculations. What you need is the size of the aperture magnified by the lens, as it looks through the lens from the lens front. As the lens magnifying...
When I was more curious about sharpness and less lazy, I tested a 180mm and a 240mm Apo-Ronars at about 1:20. Those were in shutters but still their largest aberration was coma - just as with the...
Here is an example - chromatic aberration of a 150mm Rodagon and a 150mm Apo-Rodagon-N from official Rodenstock publications, brought to the same scale. The difference between the other modern APO...