Dal 50 -200 WR inside group dirty

Jeff Lopez · 02-22-2018, 10:10 PM

Hi guys!
I just got a DA L 50-200 WR to complete my 3 Cheap Trinity.
The middle group, specifically the element on front of the aperture,looking through front element, is kind of hazed, not fungus.
I removed the front element , and there is a ring where the front element is screwed to.
The middle element has a baffle with 3 screws. It looks like if I unscrew the middle baffle, the hazed element might go off, but the baffle has to be removed first..
In order to remove said baffle, it looks like the retainer front element ring has to be removed first so the baffle slides out..
Question is, does that retainer ring screws out? it has 6 screw holes, 3 are used by the front group assembly.

**aslyfox** · 02-23-2018, 07:34 AM

perhaps these threads might be of help

Disassemble front element of zoom lens SMC DA 50-200mm WR - PentaxForums.com

Pentax Lens Disassembly Database - Page 11 - PentaxForums.com

I will admit that I haven't read them

and I would not dare try to do anything like that

Jeff Lopez · 02-23-2018, 11:55 AM

Thanks for the links..I already did what was done on the first link..
Ill post some pics..Anyway, the lens cost me only shipping so Ill risk it..

Jeff Lopez · 02-23-2018, 05:55 PM

The ring that holds the front group indeed screws out.
There are 3 shims, keep that in order.
There is a matte circular paper around the middle lens, underneath that are 3 screws.
Unscrew them, and put the lens on your palms, tap it at the back, and the middle group will pop out.
Now this group seems to be replaced as a unit, as the lens are plastic sealed to the middle assembly, but that where is my problem. There is some type of haze inside the group, and the elements are sealed.
So I slightly scraped around the back element seal carefully.
This is going to be a bit gross..If you dont like unhealthy methods, stop reading and entertain yourself with the K1 Mark 2 threads.

02-22-2018, 10:10 PM	#1
Jeff Lopez Veteran Member Join Date: Dec 2016 Posts: 531	Dal 50 -200 WR inside group dirty Hi guys! I just got a DA L 50-200 WR to complete my 3 Cheap Trinity. The middle group, specifically the element on front of the aperture,looking through front element, is kind of hazed, not fungus. I removed the front element , and there is a ring where the front element is screwed to. The middle element has a baffle with 3 screws. It looks like if I unscrew the middle baffle, the hazed element might go off, but the baffle has to be removed first.. In order to remove said baffle, it looks like the retainer front element ring has to be removed first so the baffle slides out.. Question is, does that retainer ring screws out? it has 6 screw holes, 3 are used by the front group assembly.

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02-23-2018, 07:34 AM	#2
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,582	perhaps these threads might be of help Disassemble front element of zoom lens SMC DA 50-200mm WR - PentaxForums.com Pentax Lens Disassembly Database - Page 11 - PentaxForums.com I will admit that I haven't read them and I would not dare try to do anything like that

02-23-2018, 11:55 AM	#3
Jeff Lopez Veteran Member Join Date: Dec 2016 Posts: 531 Original Poster	Thanks for the links..I already did what was done on the first link.. Ill post some pics..Anyway, the lens cost me only shipping so Ill risk it..

02-23-2018, 05:55 PM	#4
Jeff Lopez Veteran Member Join Date: Dec 2016 Posts: 531 Original Poster	The ring that holds the front group indeed screws out. There are 3 shims, keep that in order. There is a matte circular paper around the middle lens, underneath that are 3 screws. Unscrew them, and put the lens on your palms, tap it at the back, and the middle group will pop out. Now this group seems to be replaced as a unit, as the lens are plastic sealed to the middle assembly, but that where is my problem. There is some type of haze inside the group, and the elements are sealed. So I slightly scraped around the back element seal carefully. This is going to be a bit gross..If you dont like unhealthy methods, stop reading and entertain yourself with the K1 Mark 2 threads.