Fujinon 360mm f-6.5 Lens

[sanking]

Sandy ... is there some type of factor or estimate for getting the estimated "full" image circle compared to what is published by the manufacturer at f-22? The Fuji 360mm that I have at the top of this thread has an image circle at 485 at f-22. What might I expect the "full" circle to be? What type of shutters might limit the circle? Is that called mechanical vignetting? Are the Copal 1 shutters less prone to this due to their larger size?

Thanks,
Rick

The actual circle of illumination varies a lot even when we compare lenses of the same design, i.e. dagors, plasmats, etc. However, virtually all plasmats are capable of at least 70 degrees of coverage, and most are capable of 77 degrees or slightly more. However, the only factor I am aware of that you can use to determine actual coverage at the extreme limits for ULF work is the human factor, i.e. experience.

I am not personally familiar with the Fujinon L lens. Is this a tessar or plasmat type lens. If it is a tessar type the coverage should be less than for the plasmat type -W series, but it still should be enough to cover 7X17 with a couple of inches of movement.

Sandy King



Sandy King

 

[Harrigan]

"Another thing you have to take into consideration is that while the lens itself may provide X amount of coverage shutter mounting may reduce this coverage."

Shutter mounting lenses does not change the lens image circle if done to the proper lens spacing pecs. If the lens spacing is altered this can and will effect the size of the image circle and cause other problems with abberations.

If you have a lens shutter mounted and the image circle is altered then most likely the lens spacing has not been properly matched to the original spec. I think commonly extreme wide angle lenses are spaced very tightly and when you shutter mount them this tight spacing might not be possible in a shutter mount, the lens spacing is altered thus effecting the lens image circle. Shutter mounting a lens alone should not have any effect on the image circle if done properly.

 

[Colin Graham]

(Front-mounting can substantially reduce the image circle, where the shutter clips the light path, just to avoid confusion.)

 

[sanking]

(Front-mounting can substantially reduce the image circle, where the shutter clips the light path, just to avoid confusion.)

Spacing that is too wide can definitely reduce coverage wtih wide angle designs. A shutter opening that is too small can also cause the lens to vignette, either with front mounting as above, or with regular mounting.

Sandy King

 

[Harrigan]

Spacing that is too wide can definitely reduce coverage wtih wide angle designs. A shutter opening that is too small can also cause the lens to vignette, either with front mounting as above, or with regular mounting.

Sandy King

You are right a front mounted lens can get cut off by the shutter and vignette but only under very rare circumstances will a shutter vignette with a normal type mounting and only if if gets in the way of the lens or blocks the optics or some other rare circumstance. Perhaps a hypergon or a very long lens that is slowed down if f-opening by the shutter. These are rare circumstances but yes it can happen but not normally with regular lenses.

 

[Luther]

Fujinon-W 360MM F6.3 W/Copal 3

I have the older 6.3 model, its MC, and use it on 11x14, without problems, even with 2-3 inches of front rise. Its an outstanding lens.

Hello All,

I am new to the Forum and obviously a late arriver to this thread. I just bought a Fujinon-W 360MM F6.3 W/Copal 3 shutter for US $395.00. I have a Fuji 300 C, which is supposed to provide complete 8x10 coverage. However, I thought that buying the Fujinon-W 360MM F6.3 will provide more than enough movement. I used the information in your thread to make the determination. The purchase includes a quality CoPal 3 shutter and the proper lens caps.
If any of you happen upon this thread again, please provide me some feed back on my buying decision as the Fujinon Compact 300mm/8.5 is now $1,199.99 at Badger Graphics in the USA. The cost of a new Fuji lens in the 300 mm range is now well over $1000.00. Used Fuji lenses at 300 mm and above are commanding premium prices.

 

[FredW]

Hello All,

I am new to the Forum and obviously a late arriver to this thread. I just bought a Fujinon-W 360MM F6.3 W/Copal 3 shutter for US $395.00. I have a Fuji 300 C, which is supposed to provide complete 8x10 coverage. However, I thought that buying the Fujinon-W 360MM F6.3 will provide more than enough movement. I used the information in your thread to make the determination. The purchase includes a quality CoPal 3 shutter and the proper lens caps.
If any of you happen upon this thread again, please provide me some feed back on my buying decision as the Fujinon Compact 300mm/8.5 is now $1,199.99 at Badger Graphics in the USA. The cost of a new Fuji lens in the 300 mm range is now well over $1000.00. Used Fuji lenses at 300 mm and above are commanding premium prices.

You got a great deal, it has plenty of coverage for 8x10, I use it as my standard lens on 8x10. Though the lens is much bigger than the 300C, but the corresponding lens from Rodenstock and Schneider are much larger and heavier, at least that was what i recall from when I purchased some 20 years ago.