[LargeFormat] 360mm Teles and Longer Lenses in General

[Les Newcomer]

The 203 is a symmetrical air spaced design. Just like an Artar.

the next time the sun is shining and you feel creative, Chuck up the 203
and remove the front cell

You'll end up with a very slow 14" lens.

The old fstops were

11   16   22   32   45
19   28   38   56   79 are the new f stops

I'd round them off to

16   22.5   32   45.5   64.5


I'm not gonna say what kind of image you'll get. Let the film speak for
the lens. and a 14" that takes up no extra space and no extra weight has
to be worth something!


Les






Clive Warren wrote:
> 
> >
> >I actually have two 360s.  The TX and a Fujinon "A" lens.  I believe that
> >the Fuji is the sharpest lens I own, and it will cover 11x14!  The TX will,
> >however, work on my Wista field camera.
> >
> >You can still go with the procedure I mentioned by focusing the image on a
> >white wall or piece of paper.  You may get better results by cutting a
> >lens-sized hole in a piece of cardboard to shield some of the stray light.
> >You will get a recognizable image when you hold the lens elements the
> >appropriate distance from the sheet of white paper/wall.
> 
> snippety
> 
> Karl,
> 
> Have always wanted to try out one of those Fujinon teles - what you
> have said makes me even more keen. Invariably I find that on my
> travels it is the longer lenses that get most use. On the last US
> trip it was the trusty 203mm Ektar that was most often on the camera
> and I found myself wanting something much longer on many occasions.
> 
> The 15" Tele Optar is a fine hunk of glass - but it is a hunk of
> glass and weighs a ton. Just too much to even consider lugging around
> through airports and dragging around on trails. How heavy is the
> Fujinon A 360mm?
> 
> I often use the technique you have described for a quick check of
> lens coverage  - one real test of a lens is to see if it can image
> the filament in a bright quartz light or the surrounding glass
> envelope without losing the plot.
> 
> One of the most amazing lenses in the growing armoury here is a 21
> 1/4" f11 Copying Ektanon - I guess from the old world of broad sheet
> newspapers. It has more coverage than I'll ever need - have yet to
> try it out on an 8x10 camera with a 5x7 back for head/shoulder
> portraiture. Neither of my 5x7 cameras have enough bellows for
> anything much more than infinity focusing. It's too heavy to hang off
> a piece of drainpipe fixed to the lens board - but still nowhere near
> as heavy as the 15" Optar!
> 
> Cheers,
>         Clive
> 
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