The Crayford telescope focuser design – developed in 1971 by John Wall and named after the Crayford Manor House astronomical society – has a number of important advantages over rack-and pinion and can be home built out of wood by almost anybody with a bit of patience and the right tools at hand.
I designed this focuser specifically to carry the weight of a Nikon D7100 camera on prime focus (± 800 gr), which is considerably heavier than even the largest eyepieces. So far, it is holding up admirably. more »
Tag: "construction"
The Nikon F-Mount was launched with the Nikon F camera in 1959 and has remained virtually unchanged since, making it the only lens mount still in production over 5 decades after its introduction. The camera mount comes essentially in 3 flavors: F, AI-S and AF, with some minor adaptations for particular cameras, mostly the digital entry-level models, which feature 2 extra screws and the minimum aperture confirmation notch, discussed later on. more »
On November 25 last, Tamron announced the launch of the successor of its very respectable 200-500mm f/5-6.3 ultra tele-zoom, the Di SP 150-600mm F/5-6.3 VC USD, the first afficionado super tle at under $1500
On November 25 last, Tamron announced the launch of the succesor of it's very respectable 200-500mm f/5-6.3 ultra tele-zoom (test here), the Di SP 150-600mm F/5-6.3 VC USD. What does that letter-soup stand for, you wonder? Di means “Digi… more »
Nikon USA anounced an instant savings offer for a D5000 "Outfit", which includes the AF-S DX 18-55 f/3.5-5.6G VR and the AF-S DX 55-200 f/4-5.6G VR lenses, which can now be had just 5 cts. short of U$ 1.000. more »
by gerard.prins on Mar 19, 2009 in Nikon Mount Lenses, Nikon Cameras, User Experiences, Review • Leave a comment »
Review of the ASP 18-200mm f/3.5-6.3D IF DC Sigma: You can’t have at All.Strengths, weaknesses, competition and pro reviews. In spite of its optical flaws, still quite respectable for an extreme zoom at this price point. more »
by gerard.prins on Mar 18, 2009 in Nikon Mount Lenses, Nikon Cameras, User Experiences, Review • Leave a comment »
Review of the APO 100-300mm f/4D EX DG HSM Sigma: Sharp, even at f/4, excellent construction, great value for money. more »
by gerard.prins on Mar 13, 2009 in Nikon Mount Lenses, Nikon Cameras, User Experiences, Review • Leave a comment »
Review of the ATX Pro 12-24 mm f/4G Tokina. Strengths and weaknesses, links to pro reviews. Conclusión: big bang for your buck. more »