Removing back element of Sigma 180mm Macro

pentaxfall · 09-08-2017, 04:33 PM

Hi

I plan to clean the back element of Sigma 180mm f3.5 MACRO APO DG. Ideally I would like to unscrew the glass without messing with the connectors.
On the back of the lens, there are few screws on the wall(B) and few screws on steel plate(A). Please see the picture below..

if I remove the screws B, will I be able to unscrew the back-element without messing with electronic contacts.
I am new to opening lens. if anyone has ideas please share. .

Thanks
Ramesh

Attached Images

**Digitalis** · 09-08-2017, 06:15 PM

This is not a common lens in K mount, removal of the rear cell of this lens is not recommended for the inexperienced, as it requires a degree of skill in lens disassembly to safely access it. Removing the "A" screws should only be done when one wishes to remove the lens mount, and should not be done without due care.

Originally posted by pentaxfall

if I remove the screws B, will I be able to unscrew the back-element without messing with electronic contacts.

The B screws hold the rear baffle, there are two screws on opposite sides that hold it in place: they are easy to remove and doing so will not interfere with the internal electronics of the lens. The baffle itself is plastic and it easily lifts out, giving you easier access to clean the rear element.

pentaxfall · 09-08-2017, 07:51 PM

Thanks Digitalis, that is exactly what I wanted to know.

09-08-2017, 04:33 PM	#1
pentaxfall Veteran Member Join Date: Sep 2017 Location: Bangalore, India Posts: 581	Removing back element of Sigma 180mm Macro Hi I plan to clean the back element of Sigma 180mm f3.5 MACRO APO DG. Ideally I would like to unscrew the glass without messing with the connectors. On the back of the lens, there are few screws on the wall(B) and few screws on steel plate(A). Please see the picture below.. if I remove the screws B, will I be able to unscrew the back-element without messing with electronic contacts. I am new to opening lens. if anyone has ideas please share. . Thanks Ramesh Attached Images

09-08-2017, 06:15 PM	#2
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	This is not a common lens in K mount, removal of the rear cell of this lens is not recommended for the inexperienced, as it requires a degree of skill in lens disassembly to safely access it. Removing the "A" screws should only be done when one wishes to remove the lens mount, and should not be done without due care. Originally posted by pentaxfall if I remove the screws B, will I be able to unscrew the back-element without messing with electronic contacts. The B screws hold the rear baffle, there are two screws on opposite sides that hold it in place: they are easy to remove and doing so will not interfere with the internal electronics of the lens. The baffle itself is plastic and it easily lifts out, giving you easier access to clean the rear element. Last edited by Digitalis; 09-08-2017 at 06:28 PM.

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09-08-2017, 07:51 PM	#3
pentaxfall Veteran Member Join Date: Sep 2017 Location: Bangalore, India Posts: 581 Original Poster	Thanks Digitalis, that is exactly what I wanted to know.