(III) Latest and good DS (with
Barlow) configuration :
Double stack with the fluorite Perl Vixen 102/900 + 1.6x
Barlow,
Coronado SM90+T90, PST etalon & BF30
Note : the etalon (FP) is mounted on a special
2" male interface (inside the Antares barlow then not visible)...
All the sensor is illuminated !
(II) Previous DS (with Barlow)
configuration :
Double stack with the fluorite Perl Vixen 102/900 +
1.6x Barlow,
Coronado SM90+T90, PST etalon & BF30
Note : the etalon (FP) is mounted on a special
2" male interface (inside the Antares barlow then not visible)...
Unfortunately there is only a small central disk
of the sensor illuminated !
(I) Double stack (DS) with
the fluorite Perl Vixen 102/900,
Coronado SM90+T90, PST etalon & BF30
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|
At left the PV-DS and at right the
PST-DS |
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 |
|
Coronado SM90+T90 |
|
 |
|
ASI174MM, Coronado BF30, SCT
2" adapter, Coronado PST etalon, PV to 2" ring |
|
 |
|
Usable FOV at main focus (F
900mm) is about 50% of ASI174 camera sensor |
a |
 |
|
ASI174MM, Antares
1.6x barlow, Coronado BF30, SCT 2" adapter, Coronado
PST etalon, PV to 2" ring ---> F 1440 mm |
|
 |
|
Result at F 1440 mm (DS) |
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 |
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Comparo with Simple stack |
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