Sky Watcher Planetary Eyepiece - 4mm UWA

This eyepiece is ideal for observing fine details on planets and the Moon, where high magnification is required.

While it can be used, its high magnification and narrow field of view make it less suitable for observing faint, large deep-sky objects like nebulae and galaxies compared to lower power eyepieces.

UWA typically stands for Ultra Wide Angle, indicating a wider than standard field of view, which in this case is 58 degrees.

The modified Plossl design, with its five lens elements, helps to correct optical aberrations, leading to lower distortion and higher contrast performance.

Yes, as long as your telescope has a standard 1.25-inch focuser. The magnification will depend on your telescope's focal length.

Divide your telescope's focal length (in mm) by the eyepiece's focal length (4mm). For example, a 1200mm telescope would yield 300x magnification (1200 / 4 = 300).

The specific eye relief is not detailed, but high-power eyepieces like this generally have shorter eye relief, which may be less comfortable for eyeglass wearers.

Ensure the eyepiece is clean and properly seated in the focuser. Adjust the telescope's focus knob precisely. Check atmospheric conditions ('seeing'); the eyepiece may be too powerful for current conditions.

Verify that the telescope's main mirror or lens is clean. Ensure the fully multi-coated optics of the eyepiece are clean. Check if the correct eyepiece is inserted and that no obstructions are present in the light path.

Use a lower power eyepiece to locate the object first, then switch to the 4mm eyepiece. Ensure your finderscope is accurately aligned with the main telescope.