What Is This?? Paging Mr. Apochronaut!

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KurtM
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What Is This?? Paging Mr. Apochronaut!

#1 Post by KurtM » Fri Dec 16, 2016 6:17 pm

I got this in a grab bag deal off eBay a while back, have no clue what it is, but suspect maybe a photo eyepiece/relay lens? In the photo I have posed it with a pair of ordinary AO cat no 176 eyepieces for size and appearance comparison.
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AO cat no 1804 photo eyepiece 1024px.jpg
AO cat no 1804 photo eyepiece 1024px.jpg (194.67 KiB) Viewed 5599 times
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Kurt Maurer
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email: ngc704(at)gmail(dot)com
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75RR
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Re: What Is This?? Paging Mr. Apochronaut!

#2 Post by 75RR » Sat Dec 17, 2016 11:43 am

EFL = Effective Focal Length ?
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

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KurtM
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Re: What Is This?? Paging Mr. Apochronaut!

#3 Post by KurtM » Sat Dec 17, 2016 3:52 pm

That's my take. But what can it mean?

One other thing I've notice about it: when inserted into standard AO photo tubes that are compatible with AO infinity series trinoc heads, the outside diameter matches that of the photo tube fairly precisely.
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email: ngc704(at)gmail(dot)com
https://www.flickr.com/photos/67904872@ ... 912223623/

apochronaut
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Re: What Is This?? Paging Mr. Apochronaut!

#4 Post by apochronaut » Sun Dec 18, 2016 11:42 pm

seen one before but don't know.
possibly a photo eyepiece but they also had some photo telescope eyepieces, for the elaborate photo stands, to establish parfocality.
have you tried it as a photo eyepiece?

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gekko
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Re: What Is This?? Paging Mr. Apochronaut!

#5 Post by gekko » Mon Dec 19, 2016 12:17 am

Please excuse what is probably a dumb question: since it looks like a very low power eyepiece, could it be a projection eyepiece used with a prism or mirror to project an image on a wall?

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Re: What Is This?? Paging Mr. Apochronaut!

#6 Post by apochronaut » Mon Dec 19, 2016 1:08 am

for sure.

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KurtM
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Re: What Is This?? Paging Mr. Apochronaut!

#7 Post by KurtM » Mon Dec 19, 2016 2:21 am

"for sure"? ... for sure, what?? Somebody thinks it looks like a prime candidate for a projection lens?

How is it obvious that it's a low power eyepiece? (No need to excuse yourself Gekko, your questions are excellent, as usual.) 8-)

No, I haven't tried it as a photographic eyepiece, not yet.

Can't believe Phil's stumped, what's the world coming to? :shock: :lol:
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Kurt Maurer
League City, Texas
email: ngc704(at)gmail(dot)com
https://www.flickr.com/photos/67904872@ ... 912223623/

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Re: What Is This?? Paging Mr. Apochronaut!

#8 Post by billbillt » Mon Dec 19, 2016 6:27 am

gekko wrote:Please excuse what is probably a dumb question: since it looks like a very low power eyepiece, could it be a projection eyepiece used with a prism or mirror to project an image on a wall?
Hi Gekko,

I have one of the eyepiece projectors:
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Re: What Is This?? Paging Mr. Apochronaut!

#9 Post by apochronaut » Mon Dec 19, 2016 1:30 pm

There are projection eyepieces too. Not all are equipped with a right angle feature.

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Re: What Is This?? Paging Mr. Apochronaut!

#10 Post by gekko » Mon Dec 19, 2016 2:03 pm

KurtM wrote:How is it obvious that it's a low power eyepiece?
Kurt, I thought it was an eyepiece because it is shaped like a long eyepiece and the diameter of the part that inserts into the microscope looks the same as the other two eyepieces in the picture. It looked to me like a very low power eyepiece because it is physically much longer than usual eyepieces, and so I assumed (guessed) that it has a long focal length (hence low power-- think magnifying loop).

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