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Observing >> Lunar Observing

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mikiek
Pooh-Bah
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Reged: 10/10/07

Loc: SE Texas
This is wierd
      #2108085 - 01/09/08 04:46 PM

First off - I don't do drugs and I wasn't drinking!

Near the last full moon I was doing some lunar observation. After a few seconds at the EP it would get to where it looked like craters were raised plateaus rather than sunken holes. In fact a lot of features looked opposite from an altitude point of view.

I would back away from the EP, blink my eyes a few times, shake my head and go back and look again - sometimes it was back to normal sometimes not.

I know this isn't a scope issue, just an optical illusion (shadows playing tricks on me). Does this ever happen to anyone else? If so how do you 'get back to normal'?


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dgs©
Postmaster
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Reged: 03/29/04

Loc: West Monroe, Louisiana
Re: This is wierd new [Re: mikiek]
      #2108404 - 01/09/08 07:01 PM

I often get that effect when looking at pictures of the moon.

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skypilgrim
Pooh-Bah
*****

Reged: 12/25/06

Loc: PNW, US
Re: This is wierd new [Re: mikiek]
      #2108422 - 01/09/08 07:07 PM

Don't worry Mikiek, it happens to many of us. When I get that optical illusion going I remind myself that I'm looking through a telescope that reverses the image.

I think our mind knows the sun set to the west, (to the right for those of us in the northern hemisphere), so therefore the shadow must also be to the right if you are looking at a hole (crater). But the shadow is to the left so you must be looking at a raised plateau. What you have to do is you've got to override your normal "logic" and put the sun to the left.

It took a little time but it works for me. Perhaps others have better strategies.

Hope this helps,
Sam


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Carol L

*****

Reged: 07/05/04

Loc: Tomahawk, WI 45N//89W
Re: This is wierd new [Re: skypilgrim]
      #2108709 - 01/09/08 08:57 PM

It happens to all of us.. sometimes at the eyepiece, sometimes while viewing images.

Pretty weird to see 'outies' where there should be 'innies', though.


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SandiBandi
member


Reged: 01/05/08

Loc: Novo mesto, Slovenia
Re: This is wierd new [Re: Carol L]
      #2109299 - 01/10/08 01:39 AM

I did read an article about this effect once (I'll search it at home, at work now)- Just try to look at some photos of the Moon and than turn them around with some program - u'll get the same effect!

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Rod
member


Reged: 05/19/06

Loc: Bristol, UK
Re: This is wierd new [Re: mikiek]
      #2109464 - 01/10/08 05:27 AM

There was a long discussion about this with regard to lunar photographs in Sky & Telescope many years ago. As a teenager I used to have a set of back copies of S&T from the late forties and early fifties, which had a lot of letters on this subject. The perception was that it largely depended on what direction your brain thought the lighting was coming from. In my own case, I never experienced the illusion, perhaps because I already had some experience of what the moon looked like through my own, albeit small, telescope.
Incidentally, amongst these back copies were a complete set of back covers featuring portions of the (then) classic Lick Observatory photos of the first and last quarters. These could be cut out and pasted together to create two mosaics, each about four feet across, if memory serves me correctly. In my early days away from my parental home I used to have the two mosaics hanging on my wall. I don't know what happened to them, though I do still posess a scrapbook of British newspaper cuttings of the Apollo 11 moon landing.

Clear skies! (not that we've had much in southern England this winter)


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mikiek
Pooh-Bah
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Reged: 10/10/07

Loc: SE Texas
Re: This is wierd new [Re: Carol L]
      #2110072 - 01/10/08 12:16 PM

I like that - 'outies' !

From what I remember the crater floors seemed brighter than the rest of the lunar surface. Also, no shadow around the crater rims. I guess my brain was just saying 'if it's brighter it must be closer'.

The weird part was once it started happening it was real hard to 'turn it off'.


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Carol L

*****

Reged: 07/05/04

Loc: Tomahawk, WI 45N//89W
Re: This is wierd new [Re: mikiek]
      #2111378 - 01/10/08 09:13 PM

I've only had the 'outie' thing happen a few times while I was viewing over-processed images, and it was easy to shake off by closing one of my eyes... by any chance, were you using a bino-viewer?

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ages0ne
member


Reged: 10/29/10

Loc: CO, USA
Re: This is wierd new [Re: Carol L]
      #5347381 - 08/01/12 05:38 PM

yup... late last week, i suppose with Olympics on the brain, i found a couple groups of craters in which i thought looked a lot like the Olympic logo of linked rings. Both groups were only 3 craters each, but with Olympics being shoved down our media outlets ATM... it's amazing what the 'minds eye' will create for us to observe.

This same night, looking to the right of some huge mountain range, I thought I was also looking upon a raised plateau, and also found another couple craters that gave me the idea of them looking strikingly similar to the Mandlebrot set fractals...

Last night I got another quite exquisite view of that hunk-0-ice i witness circle our Moon. Awhile back someone had posted seeing a 'doublemoon' and I got to thinking what if this poster was seeing the Moons' reflection shine through this hunk-0-ice, thereby giving off the appearance of 2 moons?

Someone on my FB page suggested i give this new eyepiece a try, that it'll fit into my scope. Anyone else have any feed back?

--l0g0


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Tim2723
The Moon Guy
*****

Reged: 02/19/04

Loc: Northern New Jersey
Re: This is wierd new [Re: ages0ne]
      #5347442 - 08/01/12 06:14 PM

Yup, the old 'Inside-Out Moon' illusion. I get that all the time. It gets worse as you get older, so don't do that.


Aaron, send me a PM before you buy that eyepiece. If I remember the specifications of your scope correctly, it isn't the right one. I may be mistaken, but I believe it's both physically too large and too high a magnification for your scope. Let's check before you spend the money.


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MAURITS
professor emeritus


Reged: 09/22/09

Loc: Diksmuide (Belgium)
Re: This is wierd new [Re: Tim2723]
      #5348255 - 08/02/12 07:23 AM

Carol, "Outies - Innies" OMG that's nice said!

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droid
rocketman
*****

Reged: 08/29/04

Loc: Conneaut, Ohio
Re: This is wierd new [Re: MAURITS]
      #5348423 - 08/02/12 09:56 AM Attachment (26 downloads)

oh you mean like Wargentin did on the 30th between Schickard and Phcylids?

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Carol L

*****

Reged: 07/05/04

Loc: Tomahawk, WI 45N//89W
Re: This is wierd new [Re: droid]
      #5349000 - 08/02/12 04:31 PM

Why do people exhume 4 1/2 year old threads?

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ed_turco
Pooh-Bah
*****

Reged: 08/29/09

Loc: Lincoln, RI
Re: This is weird new [Re: droid]
      #5349027 - 08/02/12 04:48 PM

I remember the day in my youth when I first saw Wargentin, not knowing its actual contour, and thinking that all my innies were outies and that I had lost my mind.

Jury still out on that one.


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ages0ne
member


Reged: 10/29/10

Loc: CO, USA
Re: This is wierd new [Re: Carol L]
      #5349036 - 08/02/12 04:51 PM

well.... eYe can't speak for all "people", but i rather enjoy digging up old topics that may help me in finding the answer i am seeking.


--sixfeetunder


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