Quote:
Originally Posted by DavidTrap
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
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would the AP work with a Canon 40D
