How do I remove the front hood? - Summicron-R 90mm (2-piece hood)

[Leipen]

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I am trying to remove the front hood of the Summicron-R 90 (the 1977-2000 type, with the 2-piece hood), but I'm having a hard time.

I have tried, unsuccessfully, at unscrewing the top ring on the final hood piece (see A in pic below), the printed ring (see C) and the what seems another ring (see D).

The only ring I have managed to unscrew (without extracting it, however) is the one inside the hood (see B ) which enables the first hood piece to go just below the barrel's end, but then nothing moves much from there, as the final hood still can't go below there.

Is there something I'm missing? Screws that need to be removed to unlock?

Thanks

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[Pnoo]

Following. Did you solve this?

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[sekwenza]

I have the same lens and have a similar issue. I managed to remove what you list as A and B on your post but now I can't get them back on.. Hood won't go up enough for me to screw them. Was on a shoot and hastily took the rings off to screw on a regular screw onND (usually I use mattebox) and then I couldn't get them back on. 

 

[LEslie_81]

Did anyone find out how to do this?

[Leipen]

Not me, sorry

[monkT]

under the Frontring there is a small screw 

first  you have to remove the label ring ,its only glued

the you can lock the ring inside

good luck

[davidmknoble]

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Just curious why one might want to remove the hood on this lens?

[Egmenendez]

Hi! I ´m having the same problem, do you solve it? And how?! 

@monkT you said that the label ring it´s glued? How do you unglued? And this label ring it´s C?

Thanks a lot