From: Milton Aupperle <milton@outcastsoft.com>

Date: April 10, 2009 2:38:37 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Meade f3.3 FRs...


Mark;


On 10-Apr-09, at 10:21 AM, Mark Gaffney wrote:

Hi Milton, following on from my message to you privately today I`ve been re-investigating f3.3 focal reducers. I got a good deal of advice on these on the SCT user group a while ago & I think the consensus was that the new version of the Meade f3.3 FRs were OK but the older version was a bit suspect?I may have it the wrong way around. I`ve been looking at this link I believe you sent me;http://benedict.isomedia.com/homes/cvedeler/scope/focal_reducers.htm

This is the place I got my Antares f6.3 FR & looks like a good deal for them; http://www.agenaastro.com/Meade-f-3-3-Focal-Reducer-and-Variable-T-Adapter-p/ofr-me-3.3fr.htm

What do you think? Mark. 


What do I think? About what am I supposed to offer an opinion on? Pricing?


It's pretty clear the drop off on the edges of a F3.3 adapter is excessive, and you get a lot of distortion too. And you may not have enough back motion to get both cameras into focus. Lasltly, the drop off on the edges will negatively affect the star brightness of the Pick Off Prism on the OAG too for an F3.3.


Hope that helps..


Milton J. Aupperle

President

ASC - Aupperle Services and Contracting

Mac Software (Drivers, Components and Application) Specialist

#916, 742 Kingsmere Crescent S.W.

Calgary Alberta T2V2H8

1-(403)-453-1624

milton@outcastsoft.com

www.outcastsoft.com