BIG ART(ar)'s coverage?

[Dave Wooten]

Any experience with the longer Artars?

32 inch and 48 inch or others?

Coverage?

Thanks

[Ian Grant]

The title has no bearing on the context

Probably great process lenses but while use-able as taking lenses they won't be as good as the manufacturers prime lenses until well stopped down, they are flat field lenses.

Ian

[jd callow]

The title has no bearing on the context

does now

[Dave Wooten]

does now

Thanks JD

'art' has been used as jargon for artars (like wooly). I have a 19 inch red dot which I use as a taking lens and have found it to be excellent on the 8 x 10. Often I like the "look" better than that of my modern 450 Fugi C. Can t afford the Fine Art XXL lens , so thought maybe a long artar would suffice...need to cover 14 x 17.

[sanking]

Thanks JD

'art' has been used as jargon for artars (like wooly). I have a 19 inch red dot which I use as a taking lens and have found it to be excellent on the 8 x 10. Often I like the "look" better than that of my modern 450 Fugi C. Can t afford the Fine Art XXL lense , so thought maybe a long artar would suffice...need to cover 14 x 17.

The coverage of Artars is considered to be about 50 degrees or so at f/16 or f22. However, the image circle is quite a bit larger so if you stop down to f/45 or f/64 you should get acceptable performance for contact printing with a 24" Artar with the 14X17 format. With an Artar of 30" or more you should have more than enough for 14X17, even with some movements.

Sandy King

[TracyStorer]

My quick and dirty rule of thumb has been that an Artars coverage will be just slightly larger in diameter than its focal length.
Tracy

The coverage of Artars is considered to be about 50 degrees or so at f/16 or f22. However, the image circle is quite a bit larger so if you stop down to f/45 or f/64 you should get acceptable performance for contact printing with a 24" Artar with the 14X17 format. With an Artar of 30" or more you should have more than enough for 14X17, even with some movements.

Sandy King

[ReallyBigCameras]

The title has no bearing on the context

Probably great process lenses but while use-able as taking lenses they won't be as good as the manufacturers prime lenses until well stopped down, they are flat field lenses.

Ian

Problem is there is very little in the way of "prime" lenses in these focal lengths. In fact, there's nothing in "primes" longer than 550mm - assuming you consider the 550mm Fine Art XXL a prime. For modern plasmats, there's nothing longer than 480mm.

The only modern lenses this long are the Nikkor 600/800/1200 T-ED and Schneider 600/800 APO Tele-Xenar telephoto sets - which have a lot less coverage than non-telephoto designs of the same focal length - and the 600mm Fujinon C and 1100mm Schneider Fine Art XXL , which both happen to be Artar-type designs.

Even though they were optimized for 1:1, the Artars perform very, very well at infinity. Late shutter mounted Artars were even factory adjusted for smaller reproduction ratios (up to 20:1, depending on the focal length - the same as most modern "prime" lenses).

I was lucky enough to recently acquire a late model 42" Red Dot Artar in exceptional condition for about 15% of what a new 1100mm Fine Art XL would cost. I doubt if I'll be able to tell any difference in 14x17 contact prints - at least not $4000 worth.

nd in the 42" focal length the coverage is "more than I'll ever need". Even if I use the very conservative 46 degrees of coverage, the image circle comes out to over 900mm in the 42" focal length. That's enough to cover 20x24 with over 100mm to spare - and that's a conservative figure or this lens.

Kerry

[epatsellis]

Kerry,
I guess it's one more to keep my eye out for then for this camera:


Right now, the 306 Componon covers 16x20, but my choices are pretty slim for 20x24 (which is why I haven't made a 20x24 back yet.)

erie

[Dave Wooten]

Pat,

That is a nice efficient design! congrats....I do nt see how the center extension board moves forward?

[epatsellis]

Dave,
the focusing stage is leadscrew driver, similar to the Cahminox, though using full extension drawer slides instead of $$$$$ linear bearings, it's a scaled up design of my 8x10 field camera, more info here:

and here:

http://www.f295.org/DIYforum/cgi-bin.../m-1190336644/

One thing about it, It sure does make my C1 look like a small 4x5!!!