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Surplus find: Headless Zeiss T-UL with planapo objectives
http://www.microbehunter.com/microscopy-forum/viewtopic.php?f=5&t=6186
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Author:  Scarodactyl [ Sat Jul 14, 2018 4:46 am ]
Post subject:  Surplus find: Headless Zeiss T-UL with planapo objectives

Hi everyone. I just came across this slightly-decapitated baby at a surplus sale at a pretty unbeatable price. I don't really deal with compound scopes much (I have an AO one-ten that I haven't even gotten to try out yet), so I am not really sure what to do with it. I know Zeiss is a good name, and planapo is already nice. It has five objectives, all planapo: a 4/.14, a 10/.37, a 25/.65 , a 40 / 0.95 and an oil 100/1.25. Regrettably the oil objective appears to have oil in it, and the 40x looks like it might have some delamination. I can see a clear image through the center, but holding it up to my eye it looks like there are some shenanigans around the edges.
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So I am not sure what I should do here. Should I get a head for it to see how things look, or just piece it out? I'm also not sure if the oil objective can be cleaned without ruining it.

Author:  75RR [ Sat Jul 14, 2018 5:07 am ]
Post subject:  Re: Surplus find: Headless Zeiss T-UL with planapo objectives

That is the cheapest way to pick up good objectives. ;)

Here is a link to an article that can help you 'judge' the delamination:

http://www.microscopy-uk.org.uk/mag/art ... delam.html

As a matter of interest, when you raise the 40x to its 'out of the way' position does it pop up above the rim? Like so ...

Attachments:
40x.jpg
40x.jpg [ 56.95 KiB | Viewed 884 times ]

Author:  GaryB [ Sat Jul 14, 2018 5:42 am ]
Post subject:  Re: Surplus find: Headless Zeiss T-UL with planapo objectives

Very nice find.
I imagine even with some delamination they'd still be pretty good, though getting the thing up and running could be expensive as the Zeiss head and eyepieces would cost a fair amount. I think your AO uses infinity optics so not easily adapted either. Basically all is lost, and you may as well send it to me for *ahem* disposal. After all, you wouldn't want that nasty Zeiss delamination to spread and infect your AO
;)

Author:  Hobbyst46 [ Sat Jul 14, 2018 7:27 am ]
Post subject:  Re: Surplus find: Headless Zeiss T-UL with planapo objectives

The 25x0.65 objective is IMO the most interesting item, together with the rotating stage.

Author:  zzffnn [ Sun Jul 15, 2018 2:00 am ]
Post subject:  Re: Surplus find: Headless Zeiss T-UL with planapo objectives

Your 4/0.14 may be useful for macrophotography, but it may require a compensating eyepiece to produce good image.

Other objectives are too powerful macro subjects.

Your 100/1.25 may not be a planapo (it NA is unusually low for a planapo from that Zeiss series), does it say "planapo" on it?

You can stand your 40/0.95, tip down, on a transmission dissenting macroscope (using light from beneath), look from its back lens, and try to focus onto its internal lenses. You can see delamination better than way (it will look like photos #8 and #9 of my eBay listing of a delaminated Zeiss 63/1.4:
https://m.ebay.com/itm/Carl-Zeiss-plana ... 3095868891) . If it is delaminated, you may not be able to get $60 from it.

Maybe better to part it out and sell it. Or trade it.

Author:  Scarodactyl [ Mon Jul 30, 2018 5:22 pm ]
Post subject:  Re: Surplus find: Headless Zeiss T-UL with planapo objectives

zzffnn wrote:
Your 100/1.25 may not be a planapo (it NA is unusually low for a planapo from that Zeiss series), does it say "planapo" on it?

You are dead right, I got overexcited--the oil 100x is not a planapo after all, just the other four. Can anything be done with an oil-contaminated objective, or are they basically dead?
I haven't done much else on them, but I got a nikon finite head in recently which I held above the zeiss base to get a baseline sense of how functional they are. It looks to me like only the 40x is suffering from delamination, and it does show in the image it produces. The other three seem to produce good images (at least, when accounting for the mismatched optics and improvised nature of the test). I tried to take some pictures through the eyepieces but it was difficult to position the camera and hold the head in place at the same time, so they didn't really turn out.
I appreciate the help on this--I think I'll probably piece it out, since I've already got another microscope project going that I'd rather focus on. First I'll need to take a proper look at them under my stereoscope per the article just to make sure I'm right about the delamination though.

Author:  Scarodactyl [ Thu Aug 02, 2018 8:05 pm ]
Post subject:  Re: Surplus find: Headless Zeiss T-UL with planapo objectives

Just as a quick update: I feel a bit dumb, because when I actually looked at the objectives under my stereoscope, I think what I was taking for a delamination issue was instead unpolished glass surrounding the center of the lenses:
Image
(I was also perplexed by what looked to be a frosted glass surface inside the objectives, which was just the projected image of the glass bottom of the brightfield/darkfield condenser in my gemological microscope--lots to learn here).
I am assuming that must be what this is, given the concentric grinding marks and such. No wonder there are issues around the edge of the image if you hold it up to your eye and tilt it!
On the plus side, I think I only saw a single spot of what looked to be delamination per the example posted in the 25x objective, and it was pretty marginal. Presumably the issue in performance on the 40x had more to do with hand holding a nikon head above a zeiss base than anything with the objective itself. They are all fairly dusty but no mold I could see either.
Thanks everyone! I really appreciate all the help and knowledge you've shared on this.

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