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Looks like an A* 135 1.8 for $800
Posted By: Clinton, 02-24-2016, 07:50 AM

Read it carefully, it says focus is not good, and calls it a "2.8" while all the images are for the 1.8.

Pentax SMC A 135mm F2 8 ' Green Star ' Lens for Pentax K | eBay
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03-13-2016, 09:01 AM - 1 Like   #31
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QuoteOriginally posted by dcshooter Quote
OK, OK guys, here's an update.
Never expected this would attract such a crowd of kibitzers, did you? You should charge admission or at least sell popcorn.

03-13-2016, 11:58 AM   #32
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@dcshooter does soaking like this impact the SMC coating? I suppose if this is the only way to fix, there's not much of a choice though
03-13-2016, 12:07 PM   #33
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@ dcshooter I used to sell MEK, pretty brutal stuff. I don't know if you have access to one, but what about an ultrasonic cleaning bath such as the type used for jewelry? I suppose you could put MEK in it, but you might want to test it outdoors first to make sure it doesn't generate sparks or fumes.
03-13-2016, 06:50 PM   #34
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The SMC coatings are metallic oxides and pretty much impervious to any of the standard organic solvents. MEK is actually considered one of the standard solvents for removing synthetic lens adhesive when cleaning and recementing elements. I keep it soaking in a jar outside the house to avoid fumes.

I actually do have an ultrasonic cleaner, but I'm reticent to use it on glass elements, particularly ones with pre-existng flaws, for fear of microfracturing. I do use it to clean helicals and other metal parts, although I avoid using it on external parts since it can discolor anodized finishes.

03-27-2016, 07:32 AM   #35
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QuoteOriginally posted by dcshooter Quote
ultrasonic cleaner, ... ... I avoid using it on external parts since it can discolor anodized finishes.
Any progress? When I tackled dadipentak's poor floor-drop causualty - JB Media | Damaged SMC Pentax-A* 1:1.8/135 the thread fixative was of average strength - it supports your theory that that whomever worked on your lens before really overdid it.

I outright fractured a huge chunk off the outer element of a Super Tak 20/4.5 one time in the ultrasonic cleaner. Learned my lesson! I've had good success with external parts not changing color when loading the cleaner with hot deionized/distilled water only.

We're all cheering for your success!
03-27-2016, 10:30 AM   #36
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QuoteOriginally posted by dcshooter Quote
MEK is actually considered one of the standard solvents for removing synthetic lens adhesive when cleaning and recementing elements. I keep it soaking in a jar outside the house to avoid fumes.
Methyl ethyl ketone ? (Nasty stuff, but it's a great solvent -- brings back my organic chem lab days...)
03-27-2016, 12:34 PM   #37
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Latest update is I've managed with the formerly MEK and now acetone soak to remove the element cement between elements 2 +3, however I still haven't been able to get the front retaining ring out! I have no idea what the heck they used, but patience is the order of the day. Next step is to pull it form teh soak, let the solvent dry out for a couple days, and go back to heat.

---------- Post added 03-27-16 at 12:35 PM ----------

QuoteOriginally posted by jbondo Quote

I outright fractured a huge chunk off the outer element of a Super Tak 20/4.5 one time in the ultrasonic cleaner.

Yeah, I'm trying to avoid an "Ella Fitzgerald for Memorex" kind of moment:

03-27-2016, 03:36 PM   #38
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QuoteOriginally posted by dcshooter Quote
"Ella Fitzgerald for Memorex"


Have you tried boiling the elements apart? Perhaps boiling them in methylated spirits with a lower boiling point [caution: do in well ventilated area on an electric stove top or you may blow the elements apart]

04-28-2016, 06:44 PM   #39
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@dcshooter I'm afraid to ask with this thread having gone silent, what the results may have been. Any news?
04-28-2016, 07:29 PM   #40
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Ha, I've been busy with other projects. Everything is done except getting the d$#@ front group apart. My suspicion is the retaining ring has been epoxied in.
04-28-2016, 09:02 PM   #41
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I hope UHU super glue wasn't used - eeeek
08-30-2016, 05:33 PM   #42
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Is it time to revive this thread?
08-31-2016, 03:58 AM   #43
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I'm joining the discussion, I can't wait to read what's the outcome!
08-31-2016, 04:13 AM   #44
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you will have to wait in suspense as DCShooter is on vacation

last I heard he was slowly separating the front elements ....... a slow process.
08-31-2016, 05:20 AM   #45
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An angle grinder would do the job as long as putting it back together isn't a priority!

J/K...just interested in finding out whether this ever sees action again.
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