Sharpness test chart ISO12233

As I promised, I had taken some test shots to the ISO12233 test chart with my brand new AF-S Nikkor 24-70mm f/2.8G ED. This chart is really complete and allows not only to measure sharpness but also distortion, vignetting, etc.

Before starting the test, I dedicated some time to prepare the set-up required.

  • I stuck the test chart to one of my living room walls, making sure that it stayed flat against the wall, with no bubbles or irregularities.
  • I lighted the chart using two daylight lamps pointing at it from 45º angle each, and at the same height of the chart.
  • I mounted the camera on my Tripod Pro Giottos MTL8361B Carbon Fibre + MH1300-621 Quick Release Ball Head.
  • I fitted the original hood of the lens.
  • I chose a focal length of 24 mm to start with and locate the tripod at the right distance from the wall so that all the chart fitted in the frame. Notice that aligning the camera is extremely important so that I dedicated a fairly big amount of the time to fine adjust the tripod head until I had the camera perfectly aligned.
  • I switched the focusing to manual.
  • I took some test shots from which I took the sharpest one.
  • Once I got the perfect focus I did not move the focusing ring again until the end of the test at 24mm.
  • The ISO was set at 100.
  • I started with an apperture of 2.8 and went all the way up to 22 in steps of +1EV.
  • After having shot with all appertures at 24mm, I chose 35mm and repositioned the tripod, the ball head to fit the chart in the frame and manual focus again. This has to be done once more on completion of all the appertures at 35mm. The last focal lenght is 70mm, the max of the lens.

The lamps were placed behind the camera, to avoid any possible flare or lack of contrast.

Once prepared, the set-up looked as follows:

Setup1

Setup0

Setup2

Here you can see the results from the test:

At 24 mm:

Centre at 2.8

Image

Centre at 4.0

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Centre at 5.6

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Centre at 8.0

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Centre at 11.0

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Centre at 16.0

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Centre at 22.0

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Corner at 2.8:

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Corner at 4.0

Image

Corner at 5.6:

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Corner at 8.0:

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Corner at 11.0:

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Corner at 16.0:

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Corner at 22.0:

Image

Between corner and diagonal at 2.8:

Image

Between corner and diagonal at 4.0:

Image

Between corner and diagonal at 5.6:

Image

Between corner and diagonal at 8.0:

Image

Between corner and diagonal at 11.0:

Image

Between corner and diagonal at 16.0:

Image

Between corner and diagonal at 22.0:

Image

At 35mm:

Centre at 2.8:

Image

Centre at 4.0:

Image

Centre at 5.6:

Image

Centre at 8.0:

Image

Centre at 11.0:

Image

Centre at 16.0:

Image

Centre at 22.0:

Image

Corner at 2.8:

Image

Corner at 4.0:

Image

Corner at 5.6:

Image

Corner at 8.0:

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Corner at 11.0:

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Corner at 16.0:

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Corner at 22.0:

Image

Between corner and centre at 2.8:

Image

Between corner and centre at 4.0:

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Between corner and centre at 5.6:

Image

Between corner and centre at 8.0:

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Between corner and centre at 11.0:

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Between corner and centre at 16.0:

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Between corner and centre at 22.0:

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At 70mm:

Centre at 2.8:

Image

Centre at 4.0:

Image

Centre at 5.6:

Image

Centre at 8.0:

Image

Centre at 11.0:

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Centre at 16.0:

Image

Centre at 22.0:

Image

Corner at 2.8:

Image

Corner at 4.0:

Image

Corner at 5.6:

Image

Corner at 8.0:

Image

Corner at 11.0:

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Corner at 16.0:

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Corner at 22.0:

Image

Between corner and centre at 2.8:

Image

Between corner and centre at 4.0:

Image

Between corner and centre at 5.6:

Image

Between corner and centre at 8.0:

Image

Between corner and centre at 11.0:

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Between corner and centre at 16.0:

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Between corner and centre at 22.0:

Image

As it can be seen from the results above, the maximum sharpness is obtained always at f8.0. In this post I have not posted all the shots that comprise the test, since I would have doubled the amount of pictures and the post would become too long (even more than now!).

For instance, I have not uploaded the pictures at diaphragm 9.6 or 13.0. For me it resulted really difficult, if not impossible to decide whether or not the 8.0 shots are sharper than the 9.6. The difference is negligible to the human eye, or at least to Mario’s eye! hehe.

I will not condition anyone with my conclusions on this test for now. This merely intends to help the reader making his own mind about the lens quality.

In the next post about this lens, I will check the vignetting at big appertures for different focal lenghts. I will also bring my own conclusion to this test at the same time.

Hope this results handy.

Good night

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New Mario Photographez style theme applied to the blog!

After spending (not wasting) a rather long while trying a bunch of different blog theme templates… I seem to have found one that, with a bit of tweaking, suits the stile of the whole Mario Photographez idea: Simplicity, smartness and my 3 main colours in one.
I think it is properly display in most screen resolutions but I may be introducing some minor adjustments every now and then to fit them all.

I hope you like it as much as I do.

Finally it is time for a blog

Today is the day! Turning a bit philosophical I guess that eventually things that are meant to happen, just do happen! In this occasion I am talking about something as trivial as creating a blog to talk about stuff. Particularly I am going to talk about what I love doing the most in the world, PHOTOGRAPHY (capital letters required!).

But who is this guy I identify as “I”? Who am I? Well, my name is Mario Fernandez Perez. As it may result a bit shocking, yes I have 2 surnames because these are how many we have in the country I come from, Spain. I always have troubles in the United Kingdom when I say both surnames so that I tend to hide the second and identify myself as Mario Fernandez to get rid of any possible fuss. I gave already 28 laps around the 365 days´circuit of the year. Summarising, I love Photography, thing that is getting clear as I go, and clearer it will become as you read. I am electronics enginneer, carreer that I have always fancied since I was barely a child.

Now that you know my first surname, Fernandez, and that I love what I love, Photography you can have an idea of what I based in to choose my artistic name: MARIO PHOTOGRAPHEZ.

Photography is such a wide and extensive field that I also plan to talk (or should I say post) about a bunch of things that are implicitly or explicitly in relation with it. I will try to touch own personal experiences, photographic projects, professional part-time jobs I may carry out if I get lucky and get the momentum I need, publish news, show favourite pictures (mines and others) and in definitive trying to be as enjoyable and entertening as I possibly can.

For many many years this cyclical idea constantly showed up and faded down in my little brain (inside this rather big head, hehe). It has not been until tonight when I decided to give it a bit more importance, or priority, so that I listened to it and let that idea to lead me through the first steps. I look forward to updating the blog quite often.

Tomorrow I will resume with my second post, one interesting DIY job I have been working in this evening and is almost complete by now.

Good night

P.S.: As you can see I am not native english, far from that my english needs a lot of improving but this blog thing can also be a really good exercise for me and my english so a bit of patience would be much appreciated, hehehe.