The Complete Photo Manual: Skills + Tips for Making Great Pictures
from $12.99
United Scientific Supplies LCV520 Double Convex Lens, 50 mm Diameter, 500 mm Focal Length
from $2.46
Celestron – Focal Reducer & Field Corrector Imaging Accessory – Reduces Focal Length & Ratio 37% – f/10 to f/6.3 – Ideal for Deep-Sky Observing & Astroimaging – Works w/Schmidt-Cassegrain Telescopes
$197.70
from $148.10
EISCO Double Convex Lens, 50mm Focal Length, 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms
from $11.49
Blisstime 2 Pairs of Bi-Convex Biconvex Lens Set 25mm Diameter 45mm Focal Length for Google Cardboard
from $6.99
Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length
from $56.00
How to Improvise a Full-Length Play: The Art of Spontaneous Theater
from $11.99
EISCO Double Concave Lens, 50mm Focal Length, 2" (50mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms
Finally Focused: The Breakthrough Natural Treatment Plan for ADHD That Restores Attention, Minimizes Hyperactivity, and Helps Eliminate Drug Side Effects
from $7.05
EISCO Double Concave Lens, 100mm Focal Length, 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms
from $9.99
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