[Aavso-photometry] Focal Reducer

[Radu Corlan]

On Sat, 22 Jan 2005, Greg Spear wrote:

> 
> I am in the process of configuring a setup for Transit Search which
> consists of an Meade LX-200GPS and a SBIG ST-7XME. I'm looking for a
> good focal reducer suitable for high precision photometry (< .01 mag)
> 
> So far, I've found:
>    Optec NextGEN MAXfield 0.33x
>    Meade Series 4000 Focal Reducer .33x
> 
> Does anyone have any recommendations or other reducers?
> Does anyone have any experience with these or comparison information?
> I have found some information on the Internet but would like to hear
> something from those doing photometry.

Greg,

I tried yo use the meade reducer - it works well, but the the field 
illumination is very uneven, even for a small field. Besides, you normally 
want a larger star image than the 3.3 reducer will provide. Ideally, you 
would not need any reducer, or if the field is too small, you can try the 
0.63 meade reducer, which is much better from the uniformity point of 
view.

Radu

> 
> Thanks
> 
> Greg Spear
> gspear at ucolick.org
> 
> 
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> 

-- 

-------------
Radu Corlan          rcorlan at pcnet dot ro 

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