Do I need to buy a separate flattener for the Pleiades 111 Astrograph?
No. The William Optics Pleiades 111 has a 7-element optical design that corrects for field curvature internally. It produces a native 45mm flat image circle without requiring any additional flattener or reducer, simplifying your imaging train.
What are the advantages of the WIFD internal focuser on the Pleiades 111?
The William Optics Internal Focus Design (WIFD) moves the lens assembly internally rather than using an external drawtube. This offers two key advantages:
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Increased Rigidity: It prevents focuser sag, which is critical when using heavy cameras, filter wheels, and off-axis guiders.
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Consistent Collimation: By keeping the camera and accessories fixed, it maintains perfect optical alignment as you focus.
How will the Pleiades 111's 528mm focal length frame large targets like the Andromeda Galaxy (M31)?
The 528mm focal length paired with a full-frame sensor provides a wide field of view, approximately 3.9° x 2.6°. This is perfectly suited for capturing the entire Andromeda Galaxy (M31), including its faint outer arms and satellite galaxies M32 and M110, in a single frame.
Is the f/4.8 focal ratio of the Pleiades 111 good for narrowband imaging?
Yes, the fast f/4.8 focal ratio is a significant advantage for narrowband imaging. It allows you to gather signal on faint emission nebulae, like the Cygnus Loop or the Heart Nebula (IC 1805), much faster than with slower f/6 or f/7 systems, reducing your total exposure time for each filter.
What kind of mount is required for the William Optics Pleiades 111?
The Pleiades 111 has a total weight of 10.31 kg (22.73 lbs) when fully assembled with rings and dovetail. For stable astrophotography, you should use a German Equatorial Mount with a payload capacity of at least 40 lbs (18 kg) to ensure precise tracking and guiding.
What do the included tilt and rotator adapters on the Pleiades 111 do?
These are critical tools for advanced imaging. The rotator allows you to change the orientation of your camera to perfectly frame your target without changing focus. The tilt adjuster lets you make micro-adjustments to the angle of your camera sensor to ensure it is perfectly perpendicular to the light path, guaranteeing sharp stars across the entire field of view.
