A convex lens can produce an enlarged image of an insect, so why can't it produce an enlarged image of the moon?
All lenses have a "focal length", or the distance that the lens reproduces the image from the light it collects. By itself, this image is inverted by the lens.
Lets say for this answer, we have a lens that has a focal length of 10 inches. The light passing through the lens is that of an arrow. At 10 inches from the lens, the image of the arrow is formed though it be upside down. The eyepiece of the telescope "magnifies THIS image. As you continue to move beyond the focal point, the image gets larger. Depending on the size of the lens, the amount of light gathered will dissipate and the image will be too dark to see at large size (resolution). So you need a second lens to "magnify the image found at the focal point of the convex lens. So with the one lens by itself you cannot really see the magnification of the lens.
Sony LCS-U30 Case for HDR-PJ50 XR160 CX300 XR360 NEW, NIKON EL-NIKKOR 50mm LENS, Kinetronics Static Dusting Brush 35mm, SUBAL ND30 UW HOUSING, V4 PORT MOUNT W/ STD VIEWFINDER FOR NIKON D300 D-SLR , Kodak 2" Camel Hair Brush for Removing Dust from Slides Negatives. #1499722, Nikon Super Coolscan LS-2000 Film/Slide Scanner - for Win7, Vista, XP x32 , 1.25x Viewfinder Magnifier for Leica M6 MP M8 M9 series Silver Camera Accessory, Kinetronics Static Dusting Brush 70 - 3" wide, Kinetronics Static Dusting Brush - 4" wide with a ground cable, Kinetronics Static Dusting Brush Model 100 - 4" wide, MINOLTA, Doskocil Case, Pentax, Tasco, Vivitar, Olympus OM77AF, 35MM, HUGE LOT, NIKKON EL-NIKKOR 50mm CP-2 Enlarger Lens, Durst F60 Enlarger, 1976-77 model, with 50mm Nikon lens, Vintage Wollensak 75mm f/4.5 Enlarging Raptar W/Attachment , Omega Omicron-EL 75mm f/4.5 Enlarging lens w/39mm retaining ring VG+, Rodenstock Omegaron 135mm/f4.5 Enlarging Lens w/retaining ring Made in Germany , Omega Omicron-EL 50mm f/2.8 Enlarging lens w/39mm retaining ring VG+, Argus Markfinder Camera 1947-52, Adorama Camel Hair Brush 2" #CPM15320, Kalcor No. 8471 Slide Duplicator with Optical System 1:1 #T - Accepts T Mounts, Leica 1.25x Viewfinder Magnifier for M Cameras, 1.25x Viewfinder x Magnifier 1.25x for Leica M 1.25 m 2 M6 MP M8 MP9 Silver New, Nikon Bellows III (3) Focusing Attachment "Super Mint", Adorama Camel Hair Cleaning Brush, 1" #CPM15310, Waterproof Housing Case Bag Pouch for DV Camcorder, Waterproof Housing Case
Bag SLR DSLR Camera for Canon Nikon, Waterproof Underwater Housing Case Bag SLR DSLR Camera, M42 to M42 lens Adjustable Focusing Helicoid Adapter 12mm - 17mm Carl Zeiss, M42 to M42 Adjustable Focusing Helicoid adapter 17mm - 31mm Carl Zeiss, M42 to M42 lens Adjustable Focusing Helicoid Adapter 25mm-52.6mm 25-52.6mm Carl, Nickel Leitz VOOLQ Iris Setting Ring & Lens Hood for 5cm Leica Hektor, RODENSTOCK RODAGON 50MM F2.8 ENLARGING LENS IN VERY GOOD CONDITION, NIKON EL-NIKKOR 50MM F4 ENLARGING LENS IN EXCELLENT CONDITION, Brand New Leica 1.4x Viewfinder Magnifier for Leica M 12006, Brand New Leica 1.25x Viewfinder Magnifier for Leica M 12004, Official Ricoh DW-6 DW6 0.79x Wide Lens for GX200 GX100, NIKON EL NIKKOR 50mm f 4,0 CP-2 ENLARGER LENS f 35mm FILM NM in all boxes, RODENSTOCK RODAGON 50mm f 2,8 in box READY TO USE, RODENSTOCK RODAGON 50mm f 5,6 in box READY TO USE, DURST COMPONON 150mm 5,6 SCHNEIDER-KREUZNACH enlarger lens, Leica 1:2,8/40 mm Focotar Enlarger lens, a unique item for close up or macro work canon eos mount leica focus stage look , Eagle Copying and Enlarging Lens #11771, LUIGI's CASE FOR LEICA DIGILUX 3,PANASONIC LUMIX DMC-L1,
Comments are closed for this entry.