Longest lens for Calumet

[michael_franc]

I am in the market for a tele lens. Does anyone know what is the longest lens i can use on a 4 x 5 Calumet with rail about 490mm long?

Thank You

[fred_de_van]

It depends on how close you need to focus, and that depends on what

kind if work you intend to do.

[michael_franc]

Mainly studio work from face close-up to full body. (Oh yes--a very

small studio). I like about 135 in 35mm so I assume the same would be

about 400mm in 4 x 5. Sorry I wasn't more specific in the first place.

[jennifer_waak]

You need to consider both your maximum bellows draw and rail length.

Both need to be sufficiently long. But, assuming a 400mm lens and a

490mm rail I came up with a minimum focusing distance of about 7 feet,

or about 2.25 meters (so your subject will have to be at least 7' from

the camera lens to be in focus).

 

<p>

 

Technically, the longest lens you can use is 490mm, but that is only

focused at infinity -- no close-ups allowed. If you want to focus

between infinity and 1:1 reproduction you will need rail and bellows

that extend between the length of your lens and 2x the length of your

lens. In other words, there is an inverse relationship between how

close to your camera you want to focus and how much bellows/rail you

need. The closer to the camera the subject is, the more bellows and rail.

 

<p>

 

I don't know about the Calumet, but with many monorail cameras you can

get rail extensions and long bellows for this sort of thing.

[michael_franc]

I don't think there is a longer rail available (nor are the bellows removable) on old

Calumets. Nonetheless, thank you for the info.

[dmin-99]

Some people didn't read the question. You will be limited to about 7'

with a 400mm long-focus lens (~1:5 I:S ratio). If you use a TELEPHOTO

as you had asked, a 360 - 400mm telephoto will have a short enough

back focus to allow you to get to about 1:2 - with a correspondingly

short lens to subject distance.

[michael_franc]

That's what I needed to know. Thank you very much.

[jennifer_waak]

My bad. I did read the question but didn't realize there was a

difference in focusing distance between a tele lens and a regular

lens. I knew if I screwed up someone would show up to correct me.

[dmin-99]

Wish I knew how to paste these things correctly. Anyway, the

Schneider site lists the backfocus for their 400mm tele at 265mm -

much better than the ~400mm of a "long-focus" lens. Other "tele"

lenses should have similarly short back focus distances.

 

<p>

 

Wayne

 

<p>

 

http://www.schneideroptics.com/photography/large_format_lenses/apo-

tele-xenar_hm/56_400/apo-txr5,6-400p1.htm

[ed_balko3]

One possible way to use a long focus lens such as a 480 Ronar with

this bellows might be to mount the lens in a short extension tube to

gain the additional distance between the film plane and the lens.

This would be more useful for distant subjects rather than closeup

work.

 

<p>

 

There will be a modest loss in the front movements possible but these

shouldn't be too restrictive with a relatively short (say 6") tube.

[dmin-99]

Ed - With the 480 Ronar on the end of an extension you'll have one

hell of a lever, I wouldn't trust most cameras front standards with

that stress. A 450 Fuji would make a much lighter load.

[ed_balko3]

Wayne is correct that the Ronar is a heavy lens.

 

<p>

 

I've just completed a 5 1/2" extension tube for a 480 mm Ronar; the

tube has its own lensboard to mate with the front standard of the

camera and the lens is mounted in a second, removable board at the

opposite end of the tube. I've tried it, with the Ronar, on a Calumet

CC-400 without any apparent problems. The front standard seems to be

able to handle the weight and with the standard tightening knob good

and snug, the front standard remains vertical with no creeping.

 

<p>

 

If this hadn't proved to be the case and the front standard alone

were not able to accomodate the weight, I'd add a short extension bar

to the rail and support the tube at both ends.

 

<p>

 

The lens will focus down to about 12 feet with this tube. I built the

tube as a low cost means to permit use of the Ronar on this camera

(22" rail) for landscape photography and it should be just fine for

that purpose. One issue to keep in mind is that with this lens and

tube mounted, there is a lot of weight at the top of the tripod and

one need be careful that things are balanced.

[michael_franc]

Thanks for all the advice. The tube sounds interesting. My rail is only

19" long.