Avotius
Some guy
Anyone have any information on the Yashica GSN's rangefinder base length? I am in the market to buy an m mount camera and hear all these people telling me that I need more base length, more more more more more. I have no problems focusing the 1.7 yashinon on this camera wide open so if I can do it on this I should be able to do it on another camera, especially since my yashica's veiwfinder is pretty dirty and the focus patch sometimes requires some hunting around to find.
.....right?
.....right?
Huck Finn
Well-known
I'm confused. Isn't the GSN a fixed lens camera?
Avotius
Some guy
To quote Stephan Gandy
"Rangefinder Base length of 37mm: This translates to an effective rangefinder base length of 37mm for the 1.0x magnification R3A, and 25.6 mm(37mm x .68 magnification) for the R2A. In other words, the R3A's rangefinder is 74% as long as the standard .72 Leica M finder, while the R2A's rangefinder is 51% as long as the standard .72 Leica M finder with EBL of 49.32."
"Rangefinder Base length of 37mm: This translates to an effective rangefinder base length of 37mm for the 1.0x magnification R3A, and 25.6 mm(37mm x .68 magnification) for the R2A. In other words, the R3A's rangefinder is 74% as long as the standard .72 Leica M finder, while the R2A's rangefinder is 51% as long as the standard .72 Leica M finder with EBL of 49.32."
ully
ully
Huck Finn said:
Yes, fixed. Yashinon 1.7
Huck Finn
Well-known
Here are a couple of resources for you.
Erwin Puts on required base length & rangefinder accuracy: www.imx.nl/photosite/leica/technics/rfaccuracy.html
Depth of Field calculator: www.dofmaster.com/dofjs.html
There are numerous depth of field calculators available on line. The link above is just one. If you're not comfortable with that one, do a search & try another. It's useful to see just what you're dealing with. With a 50/1.4 mm lens wide open at 3 feet, your depth of field is one inch - not much of a margin for error.
There are different issues involved in what is a desirable base length. The first is your own eyes & how well they see. Second is the minimum that is required. Third is what is desirable for ease of focusing, which is a different matter. Fourth is the size of the prints you desire. Fifth, is how well adjusted your rangefinder mechanism is at any given time. If the rangefinder is slightly off, this will have twice the impact on the R2 or R3 than it will have on a Leica M because the base line is half the length. This is true regardless of magnification because it has to do with physical length as opposed to your ability to see & discern the image(s) (magnification).
Of course longer base line is not an issue in most photos - depending what you shoot. Focal length, aperture, & subject distance all factor in. You may not need the increased base length often, but it's there when you need it.
Erwin Puts on required base length & rangefinder accuracy: www.imx.nl/photosite/leica/technics/rfaccuracy.html
Depth of Field calculator: www.dofmaster.com/dofjs.html
There are numerous depth of field calculators available on line. The link above is just one. If you're not comfortable with that one, do a search & try another. It's useful to see just what you're dealing with. With a 50/1.4 mm lens wide open at 3 feet, your depth of field is one inch - not much of a margin for error.
There are different issues involved in what is a desirable base length. The first is your own eyes & how well they see. Second is the minimum that is required. Third is what is desirable for ease of focusing, which is a different matter. Fourth is the size of the prints you desire. Fifth, is how well adjusted your rangefinder mechanism is at any given time. If the rangefinder is slightly off, this will have twice the impact on the R2 or R3 than it will have on a Leica M because the base line is half the length. This is true regardless of magnification because it has to do with physical length as opposed to your ability to see & discern the image(s) (magnification).
Of course longer base line is not an issue in most photos - depending what you shoot. Focal length, aperture, & subject distance all factor in. You may not need the increased base length often, but it's there when you need it.