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Custom
4" Coma Correctors for the Dream Astrograph line and other
select customers. |
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Dream
received the first 4" Off-Axis-Guider, designed to mate
with the custom 4" coma corrector. You can read more about
the 4" OAG by clicking on the photo to the right. |
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The custom 4" coma corrector has an additional
20mm (82mm versus 62mm for the standard 3" and 4" coma
correctors) of back focus. This will allow the use of the 4" Off-Axis Guider (OAG) prior
to the filters. |
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The spot diagram to the left shows the quality of
the custom 4" coma corrector in combination with the 24"
f3.5 Dream Astrograph. |
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Note the RMS spot size never grows larger than 3 microns,
even 26mm off-axis (52mm image circle)! This is the full field
of a 1.5" (36mm) square CCD chip. |
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Click here
to see the vignetting chart for the above combination. |
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Click on the image to the left to see the custom 4"
coma correctors. |
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The spot diagram to the right shows the quality of
the custom 4" coma corrector on the 16" f3.75 Dream
Astrograph. |
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Click here
to see the vignetting chart for the above combination. |
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Click on the small image below to see the matrix spot
diagram, which shows chromatic performance of this corrector. |
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