Author Topic: Chipping 55mm f/1.2 Dandelion  (Read 2875 times)

Seapy

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Re: Chipping 55mm f/1.2 Dandelion
« Reply #15 on: September 16, 2018, 11:06:22 »

Only the programming of the Dandelions is still an mental torture,,,

I admit I have little knowledge of what programming is involved, but is it not possible to pre-prepare, indeed perhaps have a library of different programs for different lenses and flash the pre-prepared code across to the chip?
Robert C. P.
South Cumbria, UK

Erik Lund

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Re: Chipping 55mm f/1.2 Dandelion
« Reply #16 on: September 16, 2018, 20:35:41 »
I would be interested to see a drawing of where you can and cannot cut into the dandelion block …….
Yes, what I found out is that the Dandelions are not equal size, they differ in height especially, along the lens axis.You can trim the ends, you can trim the back curve and round off the corners.Then you can trim off more or less all martial between the pins, but hen you need to replace it with epoxy gule.
Erik Lund

Erik Lund

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Re: Chipping 55mm f/1.2 Dandelion
« Reply #17 on: September 16, 2018, 20:37:28 »
I admit I have little knowledge of what programming is involved, but is it not possible to pre-prepare, indeed perhaps have a library of different programs for different lenses and flash the pre-prepared code across to the chip?
All the Dandelions are pre-programmed to 45m f/2.8 i believe,,,
They are not designed like B's CPU's,,,So my guess would be no,,,
Erik Lund

Seapy

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Re: Chipping 55mm f/1.2 Dandelion
« Reply #18 on: September 16, 2018, 22:33:23 »
Robert C. P.
South Cumbria, UK

acgiannopo

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Re: Chipping 55mm f/1.2 Dandelion
« Reply #19 on: February 12, 2019, 14:58:47 »
Erik, i am interested in chipping a 50mm f/1,2 ai-s and a 85mm f/1,4 ai-s. Since Bjørn Rørslett's cpu chips aren't currently available and as i saw you used the dandelion ones, how much can you trim of the chip and still be usable and safe to install? 85mm has more space than the 50mm but still it's a challenging process. Thank you inadvance.

Erik Lund

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Re: Chipping 55mm f/1.2 Dandelion
« Reply #20 on: February 12, 2019, 15:29:02 »
My recommendation is to buy a handful of Dandelions and use the trial and error approach.


It's a few tenths of a millimeter you can remove from the rear, keeping the radius parallel front and rear, if you get too far the springs pop out, you stop just before that, when the plastic gets thin, feel it with a nail carefully.



The 50mm and 55mm 1.2 both needs trimming of the rear element all the way to the 'rear aperture' painted circle to clear, the rest you have to shave off the Dandelions rear, study the images. This is a great risk since you will be removing the aluminium that is holding the rear lens element in place.


Good luck, you will need it!



Erik Lund