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Author Topic: HR Rodenstock questions  (Read 11651 times)

thsinar

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HR Rodenstock questions
« Reply #20 on: May 12, 2007, 09:12:47 am »

for those interested in the Rodenstock Digital lenses:

here 2 attachments with all relevant technical data for those lenses, from the 28mm to the 210mm HR (High-Res) or non-HR Sinaron digital (they are the same).

[attachment=2477:attachment]

[attachment=2478:attachment]
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Thierry Hagenauer
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bjanes

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HR Rodenstock questions
« Reply #21 on: May 12, 2007, 10:34:20 am »

Quote
for those interested in the Rodenstock Digital lenses:

here 2 attachments with all relevant technical data for those lenses, from the 28mm to the 210mm HR (High-Res) or non-HR Sinaron digital (they are the same).

[a href=\"index.php?act=findpost&pid=117095\"][{POST_SNAPBACK}][/a]

Thierry,

Resolution of at least 60 lp/mm over a relatively large field is indeed impressive. That's 120 line widths/mm, which sounds more impressive. Do you have MTF graphs for these lenses?

Bill
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uaiomex

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HR Rodenstock questions
« Reply #22 on: May 12, 2007, 03:44:00 pm »

Merci Thierry for the link.

HEY REINAR
Is picture bkk-122.jpg in the airport series taken with a 37X49mm sensor and a HR Digitar 35mm Rodenstock? If yes, did you accomplish those verticals completely in camera using lens shift or you used in whole or in part Photoshop to get those verticals "plumbed"?
Thanks
Eduardo


Quote
Eduardo,

IMO, it is superb quality with movements: one has only to go to rehnniar's homepage to be convinced about this:

http://www.tangential.de/suvarnabhumi/

Thierry
[a href=\"index.php?act=findpost&pid=117060\"][{POST_SNAPBACK}][/a]
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rainer_v

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HR Rodenstock questions
« Reply #23 on: May 12, 2007, 05:03:39 pm »

it was taken with the 28HR and was shifted in camera not in photoshop...

Quote
Merci Thierry for the link.

HEY REINAR
Is picture bkk-122.jpg in the airport series taken with a 37X49mm sensor and a HR Digitar 35mm Rodenstock? If yes, did you accomplish those verticals completely in camera using lens shift or you used in whole or in part Photoshop to get those verticals "plumbed"?
Thanks
Eduardo
[a href=\"index.php?act=findpost&pid=117163\"][{POST_SNAPBACK}][/a]
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rainer viertlböck
architecture photograp

Ray

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HR Rodenstock questions
« Reply #24 on: May 12, 2007, 08:36:21 pm »

Quote
Resolution of at least 60 lp/mm over a relatively large field is indeed impressive. That's 120 line widths/mm, which sounds more impressive. Do you have MTF graphs for these lenses?
[a href=\"index.php?act=findpost&pid=117109\"][{POST_SNAPBACK}][/a]

Bill,
I think I've seen MTF graphs. I'm not sure whether for Sinar Digitar or Rodenstock.

70% MTF at 60 lp/mm seems even more hype than the claims for Sigma/Foveon resolution. I've also come across reports of these lenses being adapted for use with Canon DSLRs. For some unexplained reason the results seem to be rather underwhelming.

Not sure what's going on here. This is a subject which in my view needs a thorough airing with proper tests and comparisons.
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thsinar

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HR Rodenstock questions
« Reply #25 on: May 12, 2007, 10:03:20 pm »

Dear Bill,

unfortunately, I do not have have MTF curves. But I guess that they should be available from Rodenstock.

I will check.

Thierry

Quote
Thierry,

Resolution of at least 60 lp/mm over a relatively large field is indeed impressive. That's 120 line widths/mm, which sounds more impressive. Do you have MTF graphs for these lenses?

Bill
[a href=\"index.php?act=findpost&pid=117109\"][{POST_SNAPBACK}][/a]
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Thierry Hagenauer
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thsinar

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HR Rodenstock questions
« Reply #26 on: May 12, 2007, 11:02:11 pm »

Ray,

the Sinaron Digital (HR or non-HR) are the same as the Rodenstock.

There are tests which have been made and published by some here on this site (rehnniar and others).

Thierry

edited for addendum: be sure that the values (resolution, shift range, ...) published by Sinar are in no way "hypes". They are even relatively "conservative" values, as well for the resolution as for the shift range: it is indicated that these values are the minimum ("at least").

Thierry

Quote
Bill,
I think I've seen MTF graphs. I'm not sure whether for Sinar Digitar or Rodenstock.

70% MTF at 60 lp/mm seems even more hype than the claims for Sigma/Foveon resolution. I've also come across reports of these lenses being adapted for use with Canon DSLRs. For some unexplained reason the results seem to be rather underwhelming.

Not sure what's going on here. This is a subject which in my view needs a thorough airing with proper tests and comparisons.
[a href=\"index.php?act=findpost&pid=117195\"][{POST_SNAPBACK}][/a]
« Last Edit: May 13, 2007, 12:26:40 am by thsinar »
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Thierry Hagenauer
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thsinar

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HR Rodenstock questions
« Reply #27 on: May 13, 2007, 04:50:13 am »

... and I've forgot to mention: those resolution values are given "at the edge" of the image circle of the respective lens. Obviously, in the centre it is higher.

Thierry

Quote
70% MTF at 60 lp/mm seems even more hype than the claims for Sigma/Foveon resolution.

[a href=\"index.php?act=findpost&pid=117195\"][{POST_SNAPBACK}][/a]
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Thierry Hagenauer
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Ray

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HR Rodenstock questions
« Reply #28 on: May 13, 2007, 06:01:10 am »

Quote
... and I've forgot to mention: those resolution values are given "at the edge" of the image circle of the respective lens. Obviously, in the centre it is higher.
[{POST_SNAPBACK}][/a]

Not quite, Thiery   . I thought I'd seen MTF charts for the Schneider Digitar lenses, but I got it the wrong way round. It was a PDF file from Rodenstock at
[a href=\"http://www.phootos.com/Library/rodenstock_taking_lenses_digital.pdf]http://www.phootos.com/Library/rodenstock_...ses_digital.pdf[/url]

I'm particularly impressed with the response for the Sironar digital HR 100/f4 at 60 lp/mm. The wider angles are not quite as impressive though.

[attachment=2489:attachment]
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thsinar

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HR Rodenstock questions
« Reply #29 on: May 13, 2007, 06:09:35 am »

Thanks for the link, Ray!

Yes, the 100 HR is a fantastic lens. However, even if the wider lenses do not impress with their numbers, they are sharp until the edge fully open (28 HR and 35 HR).

Thierry

Quote
I'm particularly impressed with the response for the Sironar digital HR 100/f4 at 60 lp/mm. The wider angles are not quite as impressive though.

[attachment=2489:attachment]
[a href=\"index.php?act=findpost&pid=117246\"][{POST_SNAPBACK}][/a]
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Thierry Hagenauer
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bjanes

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HR Rodenstock questions
« Reply #30 on: May 13, 2007, 08:29:18 am »

Quote
I'm particularly impressed with the response for the Sironar digital HR 100/f4 at 60 lp/mm. The wider angles are not quite as impressive though.

[a href=\"index.php?act=findpost&pid=117246\"][{POST_SNAPBACK}][/a]

Ray,

Thanks for pointing out the MTF figures. We had discussed this before, but my memory had failed. The highest resolution on the graphs (60 lp/mm) is a good match to sensors on which the lens might be used (Nyquist = 73 lp/mm for the p45 back), unlike the Photodo MTF charts for your 35 mm format Canon lenses, where the maximum tested resolution is 40 lp/mm.

Bill
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