VITAL STATS
. Price £2,259
• Optics Airspaced apo sextuplet
• Aperture 100mm
• Focal length 550mm, f/5.5
• Focuser 3.4-inch dual-speed rack and pinion; 1:10 ratio fine adjustment knob
• Extras Dovetail bar, tube rings, adaptors, carry case, handle, retractable dew shield
• Weight 4.3kg
• Supplier First Light Optics
. Tel 01392 791000
• www.firstlightoptics.com
The Sharpstar Z4 is the latest offering from the Sharpstar family of astrograph refractors geared specially towards astrophotography. With a 100mm front element, it is second in size only to the Sharpstar 140PH. However, while its sibling boasts greater aperture and focal length, the Z4 arguably packs a significant punch with a six-element optical system. By virtue of this sextuplet design, the
