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  #21  
Old 07-03-2010, 09:57 PM
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DavidTrap (David)
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I'm pretty happy with what Bassnutt can do with the ACF/AP combo...

Might have to get me one of those in due course.

DT
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  #22  
Old 02-05-2011, 01:57 PM
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h0ughy (David)
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Quote:
Originally Posted by PeterM View Post
Hi Tony,
While this doesn't answer all your questions I hope it is helpful. I had received advice (from Optec) sometime ago that using a corrector/reducer combo in the ACF was not ideal.

You could consider the Optec F7 reducer (see link below). These are designed to work with refractors and do work very well with the Meade ACF (I use one on my 12inch LX200R). They are available at Sirius Optics (yes I declare I work there) for $369. If using with a camera/ccd you will also need a mounting plate to suit and these are around $85.
http://www.optecinc.com/astronomy/nextgen.htm

Peterm.
would that work with a canon40D (on a Meade LX200R)?
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  #23  
Old 02-05-2011, 02:06 PM
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h0ughy (David)
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Quote:
Originally Posted by DavidTrap View Post
I'm interested in this subject as there is little information about this on the web?

The AP corrector claims a 30mm illuminated circle with an distance from the reducer to the imaging plane of ~79mm. Reducing this distance will reduce the correction factor and increase the size of the illuminated circle.

The following are quotes from the AP website:

"To give a real world example, let’s assume the following: We will set up a system with the CCDT67 @ 16 mm; our AP16T - 2”/T2 nosepiece @ 29 mm; a color filter wheel @ 25 mm; and a CCD camera @ 25 mm. 16+29+25+25 = 95 mm. (305 - 95) / 305 = 0.69X 44 mm x 0.69 = 30 mm - the fully illuminated circle.

At 0.67x, the CCDT67 will cover the chip of the ST10E. It can never cover the chip of an STL series camera or the newer large size digital SLR chips, because its clear aperture is no larger than their CCD chips.

0.75x Compression ratio for SBIG ST7/8/10 (without Color Filter Wheel or T-2 extensions), when used with refractors. Fully illuminated circle: 34mm"


The Optec reducer claims a "highly corrected" 18mm circle. On the next page it says compatible with Meade ACP scopes?? (And it's not a typo as it is repeated twice).

Has anyone used either of these devices with a DSLR (APS size sensor 22.7 x 15.1mm)?? I wonder if the quote from AP refers to full frame sensors? I hope to end up with a CCD camera, but that may be some time down the track??

Thanks
David T
would the AP work with a Canon 40D
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  #24  
Old 03-05-2011, 12:50 PM
robz (Robert)
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Recently I bought some bits and peices for my Meade 12 inch ACF (2 inch visual back, and video camera adaptors) and asked the supplier about the Meade focal reducers.

I was told that the suitable type that did not ''over correct'' the feild was available but ''none in the country as yet''.

The article in question was the 0.62 LEPUS by OPTEC .

So, for all us ACF owners, this is your answer to what can be obtained locally.
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