Last updated: 5 January 2005
Sent: Monday, January 3, 2005 10:17:25 From: Graham, John L (Graham@udri.udayton.edu) I've gotten a couple of emails asking about how I adapted SLR lenses for the DSI and seeing how it's been cloudy here (and likely to stay that way for a while) I thought I'd upload a couple of pictures. The first is one of several lenses I've adapted for use with the DSI. This is a spare Olympus 50mm f/1.8 lens that has a 1.25" adapter glued directly to the lens mount. In this case the adapter is a short section cut from a spare Barlow that came with one of my Tasco refractors. Earlier versions used a short length of 1.25" ID PVC tubing. The mounting plate is designed to mount on my curved bolt tracker, Meade DS-2130 GoTo mount, or piggy-back on an telescope. The centerline of the lens is 1-5/8" from the face of the mounting plate so the DSI rests flush against the plate; this makes it easy to stabilize and orient the camera and helps to carry its weight. The second example is an Albinar 80-200mm f/3.9 zoom lens with a Minolta mounting ring. This one uses a 1.25" adapter (scavenged from another Tasco Barlow) hot-melt glued to a dust cap. This way I can use the same adapter on different lenses without sacrificing them to The Cause. The few example pictures I've had time to take using the SLR lenses have shown I can easily reach stars as faint as 12th magnitude from my back yard which is a pretty typical magnitude 3-4 suburban sky. Being able to capture such faint stars and with a wide field should make imaging targets like comets, asteroids and the outer planets a lot of fun. I've attached a recent example of a 10x60sec exposure of the Double Cluster taken with the 50mm f/1.8 lens. The image was processed with PhotoShop to reduce the background sky glow.
Return to the top of this page.
Go back to the Astrophotography Page.
Go back to my ETX Home Page.