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RAW Developer revisited

I noticed that you shot the first two shots with the 50/1.4 at 1.4. How do you eliminate vignetting? My 50/1.4 wide open on my ND with no filters vignettes. I had my ND serviced last month and they checked it for me and said the body was fine. It must be the lens. I just ordered an 85/1.4 and I'm hoping it doesn't do the same...

Greg,

Careful inspection of the MTF and related graphs for the Planar 50/1.4 in C/Y and N mounts will show that the optical design is identical. All lenses have fall-off, becoming worse as the design goes wider and faster. Stop down to reduce the problem, as p50falloff.jpg shows. While contrast is reduced when wide open, the corner resolution is remarkably good: p50crop.jpg. Finally, p50anim.gif animates the falloff between the f/1.4 and 5.6 apertures.

Test: RTSIII, P50/1.4, ISO100 negative, tripod, 4000dpi scanner.
 
Rico-

Thanks for the info and the antimated GIF! There are times when I want to shoot hi resolution (25 ISO) with minimal depth of field in natural light. I bought the 50 1.4 because I wanted to be able to shoot wide open. Your suggestion is that while there is fall-off the corner resolution is still very good. My solution if I want to shoot wide open is to compose differently and crop. right? thanks. Greg "Al" Larson
 
Question on color profile.

In the Adobe Raw Developer, should I use sRGB or Adobe RGB? My output is mainly prints from C41 machine or Epson ink jet printer.

Also, my image is very soft. Should I increase the shapeness in the raw developer, or should I use unsharp mask at the final output stage?

Finally, if anyone has an Photoshop action to open/develop all the raw files, please share your work flow.

Albert.
 
Albert, sRGB is only if you want to publish on the Web. Adobe RGB has more colors in it. If your images aresoft, and you are certain that this is not a focusing or camera shake issue, it is better to sharpen in Photoshop because Unsharp Mask and hi-pass sharpening are way more flexible than sharpening in RAW converter.
 
Albert,

This is another hot topic. Welcome to the digital world seriously lacking standardization and clarity. I have been using RGB for quite some time but have been to several pro seminars lately and ALL the instructors INCLUDING reps from labs and printers have been saying that most print shops (excluding heavy duty printing) and most inkjet printers, including I believe the Epson 2200, 7600, 9600 work in sRGB spaces. They say if you want the best, most consistent results provide files in the work spaces that they work with and for all of them to date they have said they actually work in sRGB.

Best rule? Check with your printer and use what they or it works with. Anytime you convert a file from one color space to another you are converting data and coversion equals some loss, however minute it may be.

To be continued...

Guy
 
OK...correction here. I checked with Epson and these printers are in RGB. I went back to my notes (I still have been working in RGB out of habit). The argument for using sRGB is that even though the printer works in RGB the printer output capability is smaller than both RGB and sRGB so for instance the 2200 can't print the full range of color data that you send it in your file. Supposedly sRGB files are smaller and are quicker to print.

Many portrait and wedding labs print in sRGB. Again the recommendation is talk to your printer or check the info on your own printer and provide files in the work space that matches what they output with.

A good source on this subject is shootsmarter.com/infocenter/wc007.html by Will Crocket.

Sorry to add further confusion to this subject.

Guy
 
Some time back, after digging around in several places, what I found was the following.

Both sRGB and Adobe RGB have the same number of colors in their space, i.e. 8x8x8. There are some non-major but pressumably noticeable differences in where the color spaces are manifested - I believe sRGB ignores certain rare cyan shades, among whatever else it does.

So what we have here is more of different, not necessarily better or worse. If somebody knows otherwise, please correct.

As mentioned, sRGB was intended for web presentation, whatever that implies as monitor technology evolves. What I ended up doing after trying several things is as follows.

1. I open up the original ND image in Adobe RGB. I like what I see better when I first assign it to Adobe RGB than to sRGB - a bit warmer. But, once in Photoshop, I convert to sRGB and save the working copy in sRGB to make the color shift I got in the Adobe space permanent. From there on I keep the image in sRGB. I have an action that converts to sRGB and saves as TIFF.

No, no need to thank me for adding to the confusion
happy.gif
. I just know what I like ...

Mehrdad,

I contacted Al Larson about the beta, but I think they're pretty much toward the tail end of the program.

Cheers,

DJ
 
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