Tokina SZ-210 N, 70-210mm f4-5.6, chipped!!!

            Finally I programmed the chip.

Programming the Danlion chip takes 10 minutes in a fixed focal length lens, but in a zoom you need to find the proper values of aperture first.

I had to choose a single focal length between 70~210mm, I used 150mm.
Then I had to guess the minimum and maximum aperture (F:5~29). 
Then I took photos to a gray card at full aperture and at minimum aperture at 70mm and 210mm.
The idea is to correct the programmed values to obtain the closer results to the proper exposition in all the conditions. The final values were F:5.6~19, with them all the measurements are in the +/-0.5 stops interval. It is not perfect, but no so bad neither considering that my Nikon 50mm f1.8 is inside 0/+0.5 interval.

To do so, take the 4 photos to the gray card (or any color plane surface evenly illuminated) in aperture priority mode, then look at the histogram and write the results in a chart.
If it is over-exposed for the minimum aperture change it in the programming to a more open one (smaller number), and do the opposite if the photo is under-exposed. Do the same for the maximum aperture. Consider also that the changes will affect the 70mm and the 210mm at the same time, so you can use to correct the metering the average error value.
   

Taken on: November 16, 2011

Tags:

tokina

70-210mm

DIY

chip

d90

nikon

szx721 « less

Sets appears in: • Home Made Equipment

Groups appears in: • Camera Makers • Homemade Lens more » • *DIY Photography Equipment • Tokina Lenses - Official Tag Required • DIYPhotography • NIKON D90 CLUB • Nikon D90 « less

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