GSO-based two speed crayford focuser info

This is my focuser. The link under the image goes to the great instructions on its disassembly and tuning.

Edmund Scientifics AstroScan

The AstroScan has a really impressive engineering design. See the good in-depth review here. This is how I'm rigging mine to the task.

Stock eyepieces are really good and also parfocal (28mm and 15mm). Their barrel size is interesting. It is a bit larger than a regular EP of 1"1/4. I suspect it is metric because my Russian eyepieces from TAL reflector fit the AstroScan focuser almost perfectly (this way I can use the 3x TAL Barlow lens with the AstroScan).

Telescope to Hawaii?

1 night rent is $165. It's OK for 2 nights but for 3 nights it's cheaper to UPS it back and forth.

Add up your accessories and make a decision. My ASB (Astronomer Survival Bag) alone weights optimisticaly 30 pounds!

My Zhumell 12" dob specifications

Apperture - 305 mm (12 inch)
Focal Length - 1500mm
Focal Ratio - f/4.93
Star Diagonal - 1.25 Inches (32 mm)

Finderscope - 8x50

GoTo - No

Weight Complete - 75 lbs (34 kg)

Total height - 63 inches (160 cm)

OTA length - 60 inches (152.5 cm)

Base height - 27 inches (68.5 cm)

Base diameter - 25.5 inches (65 cm)

Calculated

Aperture Gain - 1900

Visual magnitude limit - 14.2

Max FOV - 1.9 deg

Resolution - 0.38 - 0.68 sec
Maximal Magnification - 300
Optimal Magnification - 150
Minimal Magnification - 42
Absolute Maximum Magnbification - 750

See the great Telescope Equations site for the underlying theory and formulas.