Turbulence and diaphragm

Hi all,
Someone has direct experiences or documentations or you draws that speak of the technique of
diaphragm of the telescope amateur to contain, at least partly, the effects
negative of the seeing?

Thanks in advance

Giorgio Mengoli
e-mail:
Visit my page!! -- http://astrosurf.com/alpha
mirror: http://digilander.libero.it/gm2

Hi Giorgio,

I think you are asking about an "Aperture Mask"?

The mask is placed over the front of the telescope to reduce the aperture,
increase the focal length, and reduce the negative aspects of poor seeing
conditions.

Doing a google search for "telescope aperture mask" returned some useful
links for you.

Such as :-

http://www.cloudynights.com/item.php?item_id=548

http://www.astronomics.com/main/defi...f9lghe8/Page/1

Hope this helps you.


Very best wishes and clear, dark skies.

--

Paul B, York, UK.

York Astronomical Society
www.yorkastro.co.uk
Please buy from the YAS web shop and help YAS raise funds


"giorgio mengoli" wrote in message
...
Hi all,
Someone has direct experiences or documentations or you draws that speak of
the technique of
diaphragm of the telescope amateur to contain, at least partly, the effects
negative of the seeing?

Thanks in advance

Giorgio Mengoli
e-mail:
Visit my page!! -- http://astrosurf.com/alpha
mirror: http://digilander.libero.it/gm2

On Tue, 2 Jan 2007 16:01:34 -0000, "Paul Buglass" wrote:
I think you are asking about an "Aperture Mask"?

The mask is placed over the front of the telescope to reduce the aperture,
increase the focal length, and reduce the negative aspects of poor seeing
conditions

Err, it does not change the focal length, you really meant to say
focal ratio I think ?

----------------------
"giorgio mengoli" wrote in message
t...
Hi all,
Someone has direct experiences or documentations or you draws that speak of
the technique of
diaphragm of the telescope amateur to contain, at least partly, the effects
negative of the seeing?

Thanks in advance

Giorgio Mengoli

Tanks for link Paul!
Regards

Giorgio Mengoli
e-mail:
Visit my page!! -- http://astrosurf.com/alpha
mirror: http://digilander.libero.it/gm2



"Paul Buglass" ha scritto
nel messaggio ...
Hi Giorgio,

I think you are asking about an "Aperture Mask"?

The mask is placed over the front of the telescope to reduce the aperture,
increase the focal length, and reduce the negative aspects of poor seeing
conditions.

Doing a google search for "telescope aperture mask" returned some useful
links for you.

Such as :-

http://www.cloudynights.com/item.php?item_id=548

http://www.astronomics.com/main/defi...f9lghe8/Page/1

Hope this helps you.


Very best wishes and clear, dark skies.

--

Paul B, York, UK.

York Astronomical Society
www.yorkastro.co.uk
Please buy from the YAS web shop and help YAS raise funds


"giorgio mengoli" wrote in message
...
Hi all,
Someone has direct experiences or documentations or you draws that speak
of the technique of
diaphragm of the telescope amateur to contain, at least partly, the
effects
negative of the seeing?

Thanks in advance

Giorgio Mengoli
e-mail:
Visit my page!! -- http://astrosurf.com/alpha
mirror: http://digilander.libero.it/gm2

"WaltA" wrote in message
...
On Tue, 2 Jan 2007 16:01:34 -0000, "Paul Buglass" wrote:
I think you are asking about an "Aperture Mask"?

The mask is placed over the front of the telescope to reduce the aperture,
increase the focal length, and reduce the negative aspects of poor seeing
conditions

Err, it does not change the focal length, you really meant to say
focal ratio I think ?


Quite right :-). Thanks Walt. Too much New Year I think :-).

Clear skies.


--

Paul B, York, UK.

York Astronomical Society
www.yorkastro.co.uk
Please buy from the YAS web shop and help YAS raise funds


----------------------
"giorgio mengoli" wrote in message
. it...
Hi all,
Someone has direct experiences or documentations or you draws that speak
of
the technique of
diaphragm of the telescope amateur to contain, at least partly, the
effects
negative of the seeing?

Thanks in advance

Giorgio Mengoli