7x-35 = -28
5x49 and 7x35
1x245 5x49 7x35
Mars, Venus, Jupiter, Saturn, all of these are Bright Planets that are visible to the naked eye in the right situations of lighting, clarity of the sky etc. I once and only once saw Saturn through 7x35 Binoculars through an apartment window- it was quite impressive with the rings. Of course any experienced star gazer would see these objects as Planets and not moving vehicles!
You can likely determine the manufacturing year of Sears binoculars Model 2511 by checking for any serial numbers or date codes on the binoculars. You may also try contacting Sears directly or searching for vintage catalogs or advertisements that feature this specific model to find more information about its production year.
The 7 is the magnification produced - it is a ratio of the focal lengths of the lens at the eyepiece and the front (objective) lens. The 50 is width of the objective lens - in millimetres.
Good binoculars for hunting should be waterproof, 7x35 (for the best light-gathering for their size), center-focusing, long eye relief if you wear glasses, and have one adjustable eyepiece so that they can be adjusted to your personal setting for your vision. You should be able to pick up a pair meeting those specifications online for between $100 and $200.We do not recommend anything less for hunting. It doesn't make much sense to buy a cheap pair that will have to be replaced the first time you're caught in the rain. Nor does it make sense to invest hundreds of dollars in other equipment, but get cheap on the piece that will make it possible to find game. A decent pair of binoculars will cost twice as much as a poor pair, and will last a lifetime. The cheaper glasses may not make it 100 yds from the truck.
Example: 7 x 507 = Magnification.The image appears 7 times bigger through the binocs than it appears to the naked eye,giving the illusion that it's nearer.50 = the size of the main lensat the front of each side, 50 millimeters in diameter. The larger that lens is, the brighterthe image appears.
7x1=7, 7x2=14, 7x3=21, 7x4=28,7x5=35, 7x6=42, 7x7=49, 7x8=56,7x9=63, 7x10=70, 7x11=77, 7x12=84,7x13=91, 7x14=91, 7x15=105, 7x16=112,7x17=119, 7x18=126, 7x19=133, 7x20=140,7x21=147, 7x22=154, 7x23=161, 7x24=168,7x25=175, 7x26=182, 7x27=189, 7x28=196,7x29=203, 7x30=210, 7x31=217, 7x32=224,7x33=231, 7x34=238, 7x35=245, 7x36=252,7x37=259, 7x38=266, 7x39=273, 7x40=280,7x41=287, 7x42=294, 7x43=301, 7x44=308,7x45=315, 7x46=322, 7x47=329, 7x48=336,7x49=343, 7x50=350, 7x51=357, 7x52=364,7x53=371, 7x54=378, 7x55=385, 7x56=392,7x57=399, 7x58=406, 7x59=413, 7x60=420,7x61=427, 7x62=434, 7x63=441, 7x64=448,7x65=455, 7x66=462, 7x67=469, 7x68=476,7x69=483, 7x70=490, 7x71=497