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That is correct, the white one was the Orion version, some of which had single speed focusers and larger secondaries (63mm). The black Skywatch version was generation two and had a smaller secondary 26% (50mm), just big enough to fully illuminate an APS-C sensor, and a dual speed focuser with the unique internal slide out focuser extension tube.i believe the new Orions now share the same focuser as the Skywatcher but not sure about the secondary size but a search says the Orion is still 63mm. I have imaged with my Canon which has a APS-C sensor and had no field illumination problems with the 50mm and obviously it is a bit more contrasty with less central obstruction.
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