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Nicolas Claris
February 29th, 2008, 07:51 AM
40 mm - ISO 200 - ƒ4 - 1/5s

A 100 feet (30 meters) sailing boat under construction…

The roof top has just been put delicately on the deck.

http://mnclaris.free.fr/forum/SINAR/1_e75-07-1214-2491.jpg

I have reworked the derawtization… please see below
I have not deleted the above image for the good understanding of the discussion.

Nicolas Claris
February 29th, 2008, 09:58 AM
My own comment:
ƒ4 is not enough in such case… need more DOF…

John_Nevill
February 29th, 2008, 11:18 AM
How does the DR compare against the 1DsMkIII?

The shadows (workman's hair and surround) look blotchy, but that could be the jpg compression.

Nicolas Claris
February 29th, 2008, 11:41 AM
How does the DR compare against the 1DsMkIII?

The shadows (workman's hair and surround) look blotchy, but that could be the jpg compression.

Bonsoir John
this goes with my comments on DOF/ƒ4
the standing guy is OOF

Remember also that the original file is 6668x4992 pixels downsizing for the web does creates unwanted effects.

The conjugaison of both "issues" too small aperture for the subject (operator fault!) and compression are not desserving the camera…

John_Nevill
February 29th, 2008, 12:31 PM
Nicolas,

Somehow I thought it was the jpeg compression, the resolution looks superb.

I bet its going to be quite a challenge working with mixed light.

Do you aim to use for yacht interiors? I'd like to see some long exposure night shots with one.

Although this kit is well out of my league I'm afraid!

I do look forward to your diary and some excellent images.

Eric Hiss
February 29th, 2008, 12:51 PM
Hi Nicolas,
In my experience, the 40mm lens is incredibly sharp with high contrast and capable of rendering very fine detail. The lens clearly outresolves the sensor in my camera. I can believe that at a slow 1/4 s exposure the man standing could be blurry but actually the whole image looks soft even in the focal plane. Did you use a tripod for this shot?

So far these samples you have posted do not stand up well to what I am getting with my 6008 AF and Phase p20 back with the 40mm f/3.5 lens. I am trying to figure out why. The files appear to have too much sharpening or too big a radius in them to make meaningful comparisons on detail. Another question - are you setting the white and black points before converting the files?

To illustrate how good the 40mm lens can be, here's a just a snap shot from last week looking out from my studio with my 40mm. Was taken on a tripod at ISO 50. Can't recall the f/stop - sorry.
http://www.eh21.com/example%20pics/P20/CF006400-web.jpg

Here's a full sized jpeg showing crops from the above. Examine the ID plates riveted onto the boxes, both in the center of the frame and on the outside edge of the frame. Also take a look at the foreground crop.
http://www.eh21.com/example%20pics/P20/CF006400h-crops-only.jpg

Nicolas Claris
February 29th, 2008, 01:10 PM
Hi Eric
please do not forget I have this lens since one day only… And I am on y way to figure a workflow that fit me.
This shot was not on tripod (had no time for this) It is a tricky place to shoot, not like an outdoor sunny place!
My choice of using 200 iso was certainly not the best one as I had to have a too long exposure time (as camera was not mounted on tripod).
I also have to find a better way, so I agree with you on that point, to sharpen these files, the're so different from Canon's…

I'll post another picture where the definition is much better (in the night shot thread)

Eric Hiss
February 29th, 2008, 01:33 PM
Hi Eric
please do not forget I have this lens since one day only… And I am on y way to figure a workflow that fit me.
This shot was not on tripod (had no time for this) It is a tricky place to shoot, not like an outdoor sunny place!
My choice of using 200 iso was certainly not the best one as I had to have a too long exposure time (as camera was not mounted on tripod).
I also have to find a better way, so I agree with you on that point, to sharpen these files, the're so different from Canon's…

I'll post another picture where the definition is much better (in the night shot thread)

I'm looking forward to it as I want to evaluate if its worth upgrading my 6008 AF to a Hy6 or not - I know what the lenses can do, but not the Sinar back or the in camera features such as metering.

In my samples I used the default sharpening with C1 which might be too much as well. Anyhow you did okay for 1/4 second hand held. That's hard to do.

For everyone reading the thread, what this is highlighting is that medium format takes more light and a higher number f/stop (smaller actual aperture) to achieve the same DOF as with 35mm DSLRs. Combine that with the fact that MFDB like low ISO and you'll see its much harder to work with MF. But the results can be really impressive when everything comes together.

Regards,
Eric

Nicolas Claris
February 29th, 2008, 01:35 PM
Hi John

Yes I'll do some yacht interiors, but don't know when…
Yes mixed light is a bit tricky, but it is more a software question than shooting, grey card just don't help in mixed lighting…

You can see a night shot 6 seconds-400 iso jsut posted there (http://www.openphotographyforums.com/forums/showthread.php?t=5114)

hanks for taking time to look at these…

Nicolas,

Somehow I thought it was the jpeg compression, the resolution looks superb.

I bet its going to be quite a challenge working with mixed light.

Do you aim to use for yacht interiors? I'd like to see some long exposure night shots with one.

Although this kit is well out of my league I'm afraid!

I do look forward to your diary and some excellent images.

Asher Kelman
February 29th, 2008, 02:18 PM
Nicolas and Eric,

How practical is mirror lockup?

Asher

Nicolas Claris
February 29th, 2008, 02:41 PM
Nicolas and Eric,

How practical is mirror lockup?

Asher

Use it a lot! under 0.5s if I can.
On th Hy6, it is very handy, there is a button just for that near the commands.

Nicolas Claris
March 1st, 2008, 04:31 AM
Hi all
Thanks to Eric comments, I went back to work on the workflow…

This image is lacking of DOF, this was already known (as well as the use of a tripod!), but Eric did point some blotchy effects and some color shifts…
This image is tricky because there are so many different light sources…
I have experienced in the past that in such case, even the excellent grey card from Whitbal cannot be of real help… so it comes all during the derawtization process (better than in PP on tif).

So here's a new try! colors look more natural to me and images seems less blotchy.
BTW I did a slight crop on left and top.

I have deleted the hires jpeg from the original post, but, certainly more easy for everybody, have added below a 100% crop. Sarting from a 6600 pixel image to "only" 1100 posted on the web creates a lot of indesirable issues…

http://mnclaris.free.fr/forum/SINAR/080229-053025-1214.jpg

100% crop:
http://mnclaris.free.fr/forum/SINAR/080229-053025-121_100P100.jpg

Any comments? is it improved for you?

Bart_van_der_Wolf
March 1st, 2008, 07:58 AM
For everyone reading the thread, what this is highlighting is that medium format takes more light and a higher number f/stop (smaller actual aperture) to achieve the same DOF as with 35mm DSLRs. Combine that with the fact that MFDB like low ISO and you'll see its much harder to work with MF. But the results can be really impressive when everything comes together.

Yes, it's an important point to stress for those who are not used to shooting on larger formats. More light is needed to accomplish equivalent exposure quality.

Bart