Telescope Reviews: Averted vision question.

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Observing >> Deep Sky Observing

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Javier1978
professor emeritus

Reged: 02/12/09

Loc: Buenos Aires, Argentina

Re: Averted vision question. new

[Re: Doc Bob]
#5337528 - 07/26/12 10:30 PM

Well, thanks again. A lot of good advices. I will definitly trie to tap my scope when viewing a faint object.

Bob, that sounds like an interesting experiment. Unfortunatly, the blinking planetary is not available for me. What a shame, I have never seen structure details in planetaries nebulas. I wonder if my 8" scope is too small for that. Though I´ve seen the beautiful shape of M57 and M27, I´ve never seen details in targets like the Blue Planetary or the Saturn nebula, they just appear like a blob (but what a lovely color they have!)

Clear skies,

Javier.

Edited by Javier1978 (07/26/12 10:34 PM)

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uniondrone
Carpal Tunnel

Reged: 12/05/09

Loc: Streetlight Archipelago

Re: Averted vision question. new

[Re: starrancher]
#5338374 - 07/27/12 12:15 PM

Quote:

I would not necessarily say wiggle the scope . The technique is to tap the tube . Tapping just enough to get the image to jiggle a bit . At high mags a wiggle could color the object gone .
Just my couple of coppers .

For me at least, sometimes a wiggle works better than a tap and sometimes a tap works better than a wiggle. I suppose that it depends on the scope, the object, and the observer.

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blb
Post Laureate

Reged: 11/25/05

Loc: Piedmont NC

Re: Averted vision question. new

[Re: uniondrone]
#5338483 - 07/27/12 01:41 PM

For me slowely slewing or pushing the scope past an object and back over it will make it pop into view better than a tap or two on the scope. Our eyes pick up the movement of very faint objects better than stationary objects.

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Ira
Carpal Tunnel

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel

Re: Averted vision question. [Re: blb]
#5342985 - 07/30/12 08:59 AM

Unfortunately, objects that are angularly small require higher powers to reveal their "fuzzy" nature, when what one wants to do is just scan the area in a low-power wide-field eyepiece.

/Ira

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Matt2003
Post Laureate

Reged: 04/22/10

Re: Averted vision question. new

[Re: Ira]
#5343459 - 07/30/12 01:45 PM

I do tend to see more faint things when I am scanning (moving the telescope) around. But then, unless I get a good lock on something, I usually convince myself that I did NOT see this or that object.

Clear Skies,
Matt

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blb
Post Laureate

Reged: 11/25/05

Loc: Piedmont NC

Re: Averted vision question. new

[Re: Matt2003]
#5343878 - 07/30/12 05:50 PM

Quote:

Unfortunately, objects that are angularly small require higher powers to reveal their "fuzzy" nature, when what one wants to do is just scan the area in a low-power wide-field eyepiec.

How true, some of my best views of small galaxies have been made with exit pupile sizes in the range of 0.7mm to 1.5mm. More magnification than this and the galaxy only disappears. Still though moving the field-of-view enables those threshold objects to be seen at magnification, not the using of low power.

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