My MFD Journey, summing up

Sunday, 02 February 2014 21:36 administrator
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I have been using my Hasselblad 555ELD / P45+ combo for a bit over half a year now. So it is a decent time to sum up the experience. 

This is my experience, Your Experiency May Vary!

I am a camera on tripod kind of photographer. The Hasselblad V-series combined with the P45+ suits my style. This is not an integrated camera, it is a mechanical box, even if the  ELD 555 has some support for P-series backs. 

I have:
Most of the discussion is based on just two images. I shot those two images mid day on a sunny November day. I happened to shoot both with my Hasselblad and Sony and the images were close enough in both exposure and crop for a good comparison. These are no test images, just two images taken with two cameras at about the same time.

This article is not finished but will be updated now and than. An older page describing my inital experience is here.

This page contains a little bit of info how to use these pages.

Image quality
I don't have much to compare with, I have two Sony cameras, full frame 135, shooting 24 MP, the P45+ has 39 MP, quite a difference. Now, observing that difference is not really simple. A very good way to compare image quality is to make large prints, but even a camera like the Sony Alpha 99 at 24 MP can produce decent size prints that match the resolution of the eye. Bart van Der Wolf has a nice tool for calculating print sizes. If we assume 20/20 vision and a viewing distance of 50 cm that tool gives the following print sizes.

SLT 99867x578 mm
P45+1048x786 mm

Now, I normall print in A2 size, that is 420 x 594 mm, so at that size differences may not be very visible. I actually see little difference in A2 size prints.

Another way to see the images is to compare them pixel for pixel, viewing each at actual pixels. That comparison ignores the number of pixels, such a comparison always puts the camera with the lesser amount of pixels to advantage. One way to do a comparison is to resize the images to a common size. Here I chose to resize the Sony SLT images by 136%, which gives a similar vertical crop. The images here has been downscaled to fit in a narrow page. The actual pixel crops are here.

I would say that image quality at the pixel level is good on both P45+ and Sony 99. The P45+ has 1.62 times the number of pixels and that is an advantage, but both are good enough for A2 size prints with little visual difference.

 

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P45+ processed in Capture One. Colour aliasing well surpressed, possibly some more staircase aliasing compared to LR5.
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P45+ image processed in LR5. A lot of colour aliasing on the grass strains in the red box. Stair case aliasing in blue box is well surpressed.
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RawTherapy, RT has an option to reduce colour alising. Sharpened using RL Deconvolution (default settings). Little colour aliasing but staircase effekt (blue) is very visible.
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SL99 at 24 MP, little aliasing, but less detail due to fewer pixels.
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Sony Alpha 99 SLT enalerged for vertical match. Little alisian but blurry.



Dynamic range

The raw histograms of these two images processed by RawDiger are shown below:

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We can see that the histograms are similar. But we can also see that the histogram on the SLT drops much more rapidly on the SLT99 compared with the P45+. The P45+ has counts down to -12 EV, but the Sony (SLT99) goes only to -8EV. That difference is probably caused by the P45+ having more readout noise. We can see that -8EV corresponds to about 30-40 counts. Each count may correspond to an electron charge, by and large, assuming 60000 electron charges of FWC. If we assume something like 16-20 electron charges of readout noise we would expect the noise spreading down to a couple of EVs, this is what I think we see.


The images below are shown "as is". Exposure was increased 4EV and the noise reduction paramaters are set to zero but I am still using sharpening, without sharpening the noise is even more ugly. In my view the Sony image has less and better noise.

 

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P45+ in LR5, no noise reduction but sharpened
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Sony 99 SLT, no noise reduction but sharpened

Colour rendition

A more extensive aticle on colour rendition is posted here.
I have created DNG profiles using an Xrite ColorChecker, using Adobe's DNG Profile Editor and with QPCard card and software. The images below show a P45 image processed using LR5.3, Capture One 7 and RawTherapy, an image from my Son Alpha SLT 99 is include for comparison.  The images in LR5 were processed to my taste. The Capture One image was processed as well as I could, on RawTherapee I am just a beginner. Color balance interpretation differs. C1 is warmer than LR5. Other than that I don't think it is a world of difference.

 

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P45+ and Capture One
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P45+ and LR5
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P45+ RawTherapee
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SLT99 + LR5

Below I compare LR5 rendition of the P45+ and the SLT image side by side, both use camera white balance, and both are processed to my taste, so they are not suppoed to be identical.

 

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P45+, with dual illuminant profile created by Adobe DNG Profile Editor
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Sony Alpha 99 with Adobe Standrad profile

Aliasing

The main article is: here.

Aliasing arises when lens resolution exceeds the resolution of the sensor. Aliasing creates false detail, mostly observed as moiré. What I see is that a very significant part of my images show some color aliasing or moiré. This is a disadvantage of today's medium format, where sensors don't match the resolution of the lenses and the sensors lack OLP filtering.

 
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P45+, f/8, max sharpness but significant colour aliasing
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P45+, f/11 aliasing little affected by diffraction
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P45+ Aperture f/16, most aliasing gone


An odd comparison

Here are a bunch of images from a shot where I used both cameras. The images here were all scaled down to fith within a 4000x4000 box. The reason for this is mostly that the images are intended to be viewed on screen, and 1:1 view on screen represents a 2-4 times magnification compared to print. Downsizing in web browsers is probably not optimal. Some visitors reported their ratio of correct guesses and it was about 50% hit ratio. The images are clickable for large view.


Click here for the correct answers.

 
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Some thoughts on real world images vs. formal testing



On economy and feasibility




Raw images and links

The raw images used for this article are here:

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Random raw images from P45

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This is a sample with my "new" Distagon 40/4 CFE (not the IF model). The IF model is much better, but very expensive, even used. These images were shot on small aperture, like f/22 or f/16. The Hartblei Super Rotator 40/4 is based on the IF model, so it is a better lens.
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This is a sample with my "new" Distagon 40/4 CFE (not the IF model). The IF model is much better, but very expensive, even used. These images were shot on small aperture, like f/22 or f/16. The Hartblei Super Rotator 40/4 is based on the IF model, so it is a better lens.
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Planar 80,I think...
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This is a Sonnar 150/4 image shot at f/8
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This is comparable (by large) to the Distagon 40/4 images but shot on Sony Alpha 99, 24 MP full frame. The images were shot at f/16, for motion blur.
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Distagon 40/4, f/11 (?) sun partly shaded by tree top. Significantly adjusted in LR5
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Comparison images with Son Alpha 99

These images are mostly for real shooting situations, I normally carry both systems.
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Sony SAL 24-70/2.8 at f/8 SLT99 (24 MP)
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Zeiss Sonnar 50/4 at f/8 (?)
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Sony SAL 24-70/2.8 at 35 and f/8 on 99 SLT (24 MP)
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Sonnar 40/4 at f/22 (?) trying hyperfocal focus
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Sony 24-70/2.8 ZA at f/6.7
Last Updated on Thursday, 13 February 2014 13:29