PDA

View Full Version : Rodenstock Apo-Ronar 360mm f9 coverage



Curt
15-Jul-2013, 15:07
As the title indicates, is this a good long lens for 5x7? Barrel model. It stops down to f260! Does anyone have experience with exposures at f260? 98885

Steve Hamley
15-Jul-2013, 18:04
Yes, 5x7 has a diagonal of 210mm. 4/4 dialytes like the Artar, Ronar, Apo-Nikkor, etc cover as a rule of thumb, 45 degrees at infinity, so they have an image circle about equal to their focal length, in your case about 360 mm for a surplus of about 150 mm.

No experience at f260.

Cheers, Steve

Curt
15-Jul-2013, 21:25
Yes, 5x7 has a diagonal of 210mm. 4/4 dialytes like the Artar, Ronar, Apo-Nikkor, etc cover as a rule of thumb, 45 degrees at infinity, so they have an image circle about equal to their focal length, in your case about 360 mm for a surplus of about 150 mm.

No experience at f260.

Cheers, Steve

Thanks Steve, thi information is appreciated. The f260 was news to me too.

rdenney
16-Jul-2013, 03:12
Moved to the Lenses subforum.

Rick "carry on' Denney

Bob Salomon
16-Jul-2013, 05:55
The 360mm F9 Apo Ronar at 1:1 covered 14 x 18" film. It was optimized for f22 as it is shorter then 600mm. From 600mm up the Apo Ronar was designed for F32. So beyond F22 you will be entering diffraction and by F260 you should be in severe diffraction.

The 360 F9 Apo Ronar in shutter covered 318mm at infinity at F22 and was also designed to be used at f22. 318mm on 5x7 allowed for 74mm of rise and 62mm of shift in landscape format at infinity at F22. When in a shutter it will not get to near F260.

Curt
16-Jul-2013, 08:39
Thank you Bob,

If 8x10 needs 310 then 318 is tight if it were to cover at all and with no movements possible. So indeed 5x7 @ f22 gives the optimum flexibility. I had 5x7 in mind when I bought it. The lens is on the way, it's nearly new in barrel. I put in a Lower bid before I went to bed and in the morning I had won it for $78.00. I can't complain!

Bob Salomon
16-Jul-2013, 08:52
Thank you Bob,

If 8x10 needs 310 then 318 is tight if it were to cover at all and with no movements possible. So indeed 5x7 @ f22 gives the optimum flexibility. I had 5x7 in mind when I bought it. The lens is on the way, it's nearly new in barrel. I put in a Lower bid before I went to bed and in the morning I had won it for $78.00. I can't complain!
Enjoy it!

On 810 it gave 4mm of rise and 3mm of shift in landscape position at infinity @F22.

Curt
16-Jul-2013, 11:24
Enjoy it!

On 810 it gave 4mm of rise and 3mm of shift in landscape position at infinity @F22.

Thank you very much Bob I will!

Emmanuel BIGLER
17-Jul-2013, 01:57
Hello from France

To the best of my knowledge, the f/260 setting on process lenses like the Apo Ronar series was not used for taking pictures, but only for certain very specific tasks in analogue photogravure, a forgotten technique in an era where direct Computer-to-Plate is today the standard printing process.
But Bob S. can certainly elaborate about this much better than me.

And regarding f/260, for sure the lens will be diffraction-limited and the minimum recordable feature has a size of about 260 microns.
However the look of the image will certainly be different using a F/260-stopped-down apo ronar VS. a f/260 pinhole camera.

Projected at 360 mm behind the pinhole, a f/260 pinhole camera will need a pinhole diameter of 360/260 = 1.4 mm
This diameter is much larger than the optimum pinhole diameter @360mm projection distance, which for visible light is about 0.7 mm ( = (1/28) . sqrt( distance in mm) according to Leslie Stroebel's book on view camera technique)

Hence a 360 mm apo ronar lens stopped down to f/260 will yield a much better image than a f/260 pinhole camera image projected @360mm :cool:
And if you take into account that a good pinhole bought from a reliable vendor is not that cheap, you'd better use an apo ronar in all cases :rolleyes:

Armin Seeholzer
17-Jul-2013, 12:50
The 318mm are more the extrem conservative, I even use my 300mm APO Ronar on 8x10 stoped down to f32 at infinity no dark corners!
The 360mm give very nice movements on 8x10 more the a inch shift at f32 is not any problem!

This is from a user which also has the brochure from Rodenstock in german of course;--))) Also Schneider's statement about the covering power is always very conservative.

Cheers Armin

Curt
17-Jul-2013, 21:50
My apologies for the delay in replying, I had a server upgrade.

I appreciate all the fine information that's you folks took the time to write out. Along with the technical specifications I received a user evaluation. It's more than I hoped for. It's truly a global community, never in my life did I foresee such a connection. Anyway, thank you Steve, Bob, Emmanuel, and Armin!

tripspud
7-Jul-2016, 18:57
Hi! I've got an Apo-Ronar 360mm f9 in barrel mount, with a new (you can still buy them)
Packard shutter mounted behind the board. Mine stops only to f/90. There is a second
scale in mm marked 4 to 40, giving the diameter of the aperture. On my 8x10 camera.
Rich

europanorama
13-Mar-2017, 00:38
Since i have both old Apo-Ronars 360/9 and Klimsch 480/9 i will try to "hijack" this thread. if not allowed pls delete and i will reopen.
480/9 is showing abit of dust on both sides inside. so i must remove the elements. I have the right tool but its impossible to turn.
do i need seize compound and a better rubber surface to push lens against?
maybe better testing it first. Will use the 480 on old Novoflex B-Follow-Focus-system, 360 for closeups
162493.

Bob Salomon
13-Mar-2017, 08:15
Since i have both old Apo-Ronars 360/9 and Klimsch 480/9 i will try to "hijack" this thread. if not allowed pls delete and i will reopen.
480/9 is showing abit of dust on both sides inside. so i must remove the elements. I have the right tool but its impossible to turn.
do i need seize compound and a better rubber surface to push lens against?
maybe better testing it first. Will use the 480 on old Novoflex B-Follow-Focus-system, 360 for closeups
162493.
Why not just contact Novoflex in Memmingen and ask them if it can be done and if they can do it for you? I have been there several times and they are a very fully equipped machine shop and do make parts and systems for other companies. Even some not in the photo industry. They used to make the rings for Charlotte jewelry.

lungovw
14-Mar-2017, 13:23
By the way... I am gathering these calculations involving angle of view, film format, image circle, focal length, front raise....those we use to do quite often in LF, and setting them up in just one online page that I called toolbox.

https://apenasimagens.com/en/category/technique/toolbox/

I have four cases by now and some more in the pipeline... and I am very open to suggestions.

cheers

Wagner