Telephoto Zoom
what is the optical zoom on Canon EF 75-300mm lens and how to determent the optical zoom on Telephoto Lenses?
I cant figure out how to see how much optical zoom lens have.
Can you please explain me how to determine the optical zoom on lens because i have never seen any of optical zoom numbers on the box or lens itself. So please help me. Thank you.
You don’t really need a website to do this conversion, as it is 3rd grade math. Just divide the little number into the big number and you get your “X” factor.
An 18-55 zoom is a 3X zoom. A 70-210 zoom is also a 3X zoom. How can this be? You know that a 200 mm lens wold give you a much larger image than a 55 mm lens, right? The thing is, with a non-SLR camera, we tend to almost never pay attention to the focal length of the lens. It would be incredibly confusing if we tried to anyway! Image magnification is a direct function of the sensor size. There are many different sensors out there and without having some standard reference, comparing focal lengths would also become meaningless. This is why everyone still refers to the “35 mm equivalent.”
Back to your question…
Your 75-300 mm lens is technically a “4X” zoom, but who cares? On a Canon digital camera, it behaves like a 480 mm lens and that beats out pretty much ANY of the so-called super zoom point and shoot cameras for telephoto power. Well, it’s certainly in the same range as the best, but the image quality is immensely better on an SLR sensor.
In other words… The “power” expressed in terms of [some number]X doesn’t really mean that much. This is especially true in digital SLR’s. What matters is the actual focal length of the lens. Fortunately – at least for sake of comparison – the majority of DSLR’s have pretty much the same magnification factor and that is around 1.5 to 1.6. It makes direct comparisons a lot easier, but you have to develop a sense of what constitutes a “long” vs. a “moderate” telephoto.
Unless and until we have a major paradigm shift, it will still be helpful to think in terms of 35 mm equivalents when you are buying a lens. This is the “language” that we speak, using 35 mm as the de facto standard. Focal length comparisons make more sense that expressing the magnification by “zoom power.”
Here’s a chart that I’m making up just to get you started. It is in 35 mm equivalents. If you are putting a lens of this focal length on most DSLR’s, you would have to do some math. Multiply the numbers I gave by .67 if the camera has a 1.5 “lens factor” or by .625 if it has a 1.6 factor. For example, in my list, I say that 50 mm is the “normal” lens for 35 mm cameras. If the DSLR has a factor of 1.5, this would mean that a 33.5 mm lens would be “normal” for that DSLR.
Ultra Wide – 10-20
Wide Angle – 24-35
Normal – 45-55 (50 mm is the accepted “normal”)
Medium Tele – 85-135
Telephoto – 150-300
Super Tele – 400-600
If you are not familiar with the power of these lenses, you might want to check out my tutorial on the subject:
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2X HD Telephoto Zoom Lens + Microfiber for Olympus E-620 E-500 E-510 E-450 E-410 $18.99 |
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Makinon SLR ZOOM TELEPHOTO LENS- Auto 135mm f / 2.8 -AS NEW $18.56 |
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Kalimar 1.5X TELEPHOTO EXTENDER LENS FOR SLR ZOOM $9.99 |
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NEW 58mm Tele 2x TELEPHOTO Zoom Lens For Canon EOS EF-S 18-55mm f/3.5-5.6 IS $24.99 |
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Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens for Canon SLR Cameras *NEW* $99.00 |
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Minolta MD Mount 80-200mm f/3.9 Telephoto Zoom Lens 1:3.9 Macro by Albinar $39.95 |
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VINTAGE~DEJUOR ZOOM 8~AUTOMATIC Film Camera~WIDE ANGLE~TELEPHOTO $0.99 |
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new in box OLYMPUS OM mount HANIMEX 80-200mm f/3.5 telephoto zoom lens HMC $75.00 |
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Canon EF 70-200mm f/4L USM Telephoto Zoom Lens $500.00 |
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Canon EF-S 55-250mm IS f/4.0-5.6 Telephoto Zoom Lens $249.95 |
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Canon EF-S 55-250mm IS f/4.0-5.6 Telephoto Zoom Lens $219.95 |
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TELEPHOTO ZOOM LENS by ACCESS + $59.00 |
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Soligor Telephoto Zoom Lens with built-in Hood 75-260 mm f4.5 to fit Canon FD $83.30 |
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Opteka 420-800mm Super Telephoto Zoom Lens (High Definition) $85.00 |
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NEW Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens for Canon SLR Cameras USA $129.00 |
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NEW Canon EF 70-300mm f/4-5.6 IS USM Telephoto Zoom Lens (USA)+TIFFEN UV FILTER $399.99 |
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NEW Canon EF-S 55-250mm f4.0-5.6 IS II Telephoto Zoom Lens +TIFFEN UV FILTER $159.00 |
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Nikon Series E 70-210mm 4.0 Telephoto Zoom Lens $165.00 |
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iphone Smartphone Camera Telephoto Zoom Lens $13.49 |
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Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens New $150.03 |
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Komura 80-200mm f4.5 Telephoto Zoom AE1 A1 T70 T90 F1 $249.99 |
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Nikon AF Nikkor 24-85mm f/2.8-4 D IF Wide Angle Telephoto Macro Zoom Lens 202240 $41.00 |
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Bower 650-2600mm Manual Telephoto Zoom Lens for Nikon Digital SLR Camera $419.65 |
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iphone Smartphone Camera Telephoto Zoom Lens $13.49 |
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Panasonic Lumix G Vario 100-300mm f/4.0-5.6 Telephoto Zoom Lens 200-600mm on 4/3 $572.38 |
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Nikon Silver 28-80mm F3.3-5.6G Telephoto Autofocus Zoom Lens + Free UK Postage $62.71 |
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Mamiya RB 100-200 F5.2W Telephoto Zoom Lens for all Mamiya RZ67 Cameras, EC $249.00 |
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Rokinon 650-2600mm Telephoto Zoom Lens for Canon T3i T3 T2i 60D 50D 7D 5D XSi + $499.00 |
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Rokinon 650-2600mm Telephoto Zoom Lens for Canon T3i T3 T2i T1i XSi XS XTi XT + $499.00 |
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Rokinon 650-2600mm Telephoto Zoom Lens for Canon 7D 5D 60D 50D 40D 30D 20D + $499.00 |
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Yashica Kyocera AF 70-210mm f/4.5 Telephoto Zoom Lens $9.95 |
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Canon FD Mount Soligor 80-200mm f/4.5 MC C/D Telephoto Zoom Lens $9.95 |
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3.5X TELEPHOTO tele ZOOM 58mm/52 FOR D-SLR Digital/Film $48.90 |
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3.5X TELEPHOTO ZOOM LENS FOR Canon EOS 500D/Rebel T1i $48.90 |
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3.5X 3x TELEPHOTO TELE ZOOM LENS for Canon GL1,GL2,XM2 $48.90 |
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BRAND NEW IN BOX Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens FREE SHIPPIN $149.99 |
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Bosch/Philips LTC 3274/40 7.5-75mm Wide-Telephoto Zoom 1/2″-1/3″ CS Mount Lens $74.49 |
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Nikon D300 28-200mm 2.2x telephoto 440mm zoom two lens digital camera kit 12mp $899.95 |
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MINOLTA 70-210mm f4 Telephoto MD Zoom Lens $115.00 |
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Nikon AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR Telephoto Zoom Lens New In Box $245.77 |
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Sony 75-300mm f/4.5-5.6 Super-Telephoto Zoom Lens SAL-75300 $177.00 |
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Telephoto and Wide Angle zoom Lenses – Nikon mount $51.00 |
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AS IS CANON EF 75-300MM F/4-5.6 III CAMERA LENS $5.50 |
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MINOLTA MAXXUM AF 70-210mm f4 1:4 BEERCAN TELEPHOTO ZOOM LENS SONY DIGITAL w/BOX $174.95 |
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2X Telephoto Zoom Lens + Cleaning Kit + Lens Pen for Canon Rebel XTi XT XSi XS $21.84 |
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Rokinon 650-2600mm Telephoto Zoom Lens for Canon T3i T3 T2i XSi XS 60D 7D 5D + $269.00 |
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Canon Zoom Wide Angle-Telephoto EF 24-70mm f/2.8L USM Autofocus Lens Ft 5D MKIII $1,375.01 |
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12X Zoom Magnifier Micro Telephoto Telescope Camera Lens Tripod for iPhone 4G 4S $42.99 |
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Rokinon 650-2600mm Telephoto Zoom Lens for Nikon D7000 D5100 D3100 D5000 D3000 $499.00 |
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Rokinon 650-2600mm Telephoto Zoom Lens for Nikon D40 D50 D60 D70 D80 D90 D300 + $299.00 |
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2.0X Telephoto Zoom Lens + Microfiber for Olympus E-620 E-500 E-510 E-450 E-410 $17.09 |
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2.0X Telephoto Zoom Lens + Lens Pen + Bubble Level f/ Canon Rebel T3i T3 T2i T1i $22.99 |
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Telephoto Zoom + Wide Angle + Cleaning Kit + Lens Pen for Canon Powershot A720 $57.49 |
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2X Telephoto Zoom Lens + UV Filter for Canon Rebel XTi XT XSi XS T3i T3 T2i T1i $19.99 |
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Canon USA EF 70-200mm f/2.8L IS II USM Telephoto Zoom Camera Lens Fits 5D MKIII $2,149.99 |
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Sony SAL55200 55-200mm f/4-5.6 DT ED Compact Telephoto Zoom Lens – NEW Open Box $139.99 |
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Canon EF 70-300mm f/4-5.6 IS USM Telephoto Zoom Lens BRAND NEW $419.39 |
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Bower 650-2600mm Telephoto Zoom Lens for Canon EOS Digital SLR Camera $419.99 |
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650-1300mm Telephoto Zoom Lens for Olympus E-620 E-600 $379.99 |
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SIGMA KIII ZOOM TELEPHOTO FOR PENTAX LENS F=75-210mm 1:3.5~4.5 w/MACRO PRISTINE $36.00 |
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*BRAND NEW* Canon EF-s 55-250mm f4-5.6 IS = Image Stabilizer Telephoto Zoom Lens $227.77 |
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NEW Sony SAL-75300 Telephoto 4X Zoom Lens $249.00 |
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Canon EFS 55-250mm f/4.0-5.6 IS II Telephoto Zoom Lens for Canon Digital SLR Ca $193.23 |
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Telephoto Zoom 8X Camera Lens with Tripod Stand Holder For iPhone 4 4S $29.49 |
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58mm Canon EF USM 75 mm – 300 mm F/4.0-5.6 USM Telephoto Zoom Lens 75-300mm $88.00 |
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Nikon Nikkor Zoom Telephoto f4.5 – 50mm to 300mm Ai lens $265.00 |
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Sony 75-300mm f4.5-5.6 Telephoto Zoom AF Lens Alpha SLR SLT-A65 A37 A57 A33 A290 $94.09 |
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CANON FD MOUNT CANON 70-210mm f/4 TELEPHOTO ZOOM LENS $78.39 |
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Original Sony VCL-HA20 Telephoto Zoom Lens Kit 2x zoom 37mm 30mm 25mm $39.99 |
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NEW 58mm 2x TELEPHOTO LENS Zoom for Canon EOS Rebel 1100D 600D 40D 50D 7D 5D EF $24.99 |
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Vivitar 135mm 1:2.8 Telephoto Zoom Lens $39.99 |
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Canon EFS 55-250mm f/4.0-5.6 IS II Telephoto Zoom Lens for Canon Digital SLR Cam $137.51 |
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2.0X Telephoto Zoom + 0.43X Wide Angle Macro lens for Canon Powershot G11 $44.99 |
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60x Fr iPhone 4 4G 4th Microscope Pro Telephoto App LED UV Light Zoom Marco Lens $10.75 |
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65x Microscope Pro Telephoto App LED UV Light Zoom Marco Lens Fr iPhone 4 4G 4th $10.75 |
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Canon EF-S 55-250mm f/4-5.6 IS II Telephoto Zoom Lens $184.95 |
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Soligor 90-230 Auto Zoom Telephoto Lens 1=4.5 Screw Mount $8.99 |
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Canon EF-S 55-250mm f/4-5.6 IS II Telephoto Zoom Lens Plus! UV Filter Cap Keeper $188.95 |
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Canon EF 55-250mm f/4-5.6 IS II Telephoto Zoom Lens 0.43x Lens Cap Keeper Bundle $199.95 |
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Pro Telephoto 60x Microscope LED UV Light Zoom Marco Lens For iPhone 4 4S S th $10.75 |
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Pro Telephoto App Zoom Camera Marco Lens + Tripod Stand Holder For iPhone 4 4G $19.50 |
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Sony DT 55-200mm f/4-5.6 AF Zoom Telephoto Lens $199.00 |
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2X Telephoto Zoom Lens + Clening Kit + Lens Pen for Canon Rebel XTi XT XSi XS $29.99 |
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ZYKKOR TELEPHOTO LENS 80-205 M.C. AUTO MACRO ZOOM 1:4.5 $9.95 |
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CANON FD Telephoto Macro Zoom AE-1*A1*T60*T70*T90*F1*TX $209.99 |
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2X Telephoto Zoom Lens + Cleaning Kit + Lens Pen for Canon 1000D 600D 550D 500D $29.99 |
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80-210mm f/4.5-5.6 278D Tamron Telephoto Zoom Lens for Nikon AF ✿529 $64.99 |
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Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens for SLR Cameras $219.00 |
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SOLIGOR 90-230MM 4.5 TELEPHOTO ZOOM CAMERA LENS with 1A COASTAR FILTER CAPS CASE $4.99 |
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Canon EF 100-400mm f4.5-5.6L IS USM Telephoto Zoom Lens for Canon SLR Cameras $750.00 |
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Sony 75-300mm F/4.5-5.6 Alpha Mount Telephoto Zoom Camera Lens Digital SLR DSLR $125.00 |
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New Canon Lens • EF-S 55 mm – 250 mm • F/4.0-5.6 IS • Zoom • Telephoto $125.00 |
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52MM 2X HD Telephoto Lens Zoom for Nikon D90 D80 D60 D50 D40 D40X $28.49 |
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156634 ALBINAR 80-200MM F/3.9 PENTAX PK-A MOUNT TELEPHOTO ZOOM LENS $9.99 |
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10.5″x 3″ Vintage Softcase for long Telephoto & Zoom Camera lens or telescope $7.99 |
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52MM 2X Telephoto zoom Lens for Nikon D3000 D3100 D5000 D5100 D7000 $28.49 |
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Brand New Canon EF-S 55-250mm F/4.0-5.6 IS Image Stabilized Telephoto Zoom Lens $183.00 |
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52mm 2x HD telephoto lens zoom camera SLR for Nikon D5100 D3100 D60 D90 $28.49 |
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58MM 2.0X TELEPHOTO ZOOM + CLEANING KIT + LENS PEN FOR CANON EF 75-300MM $21.84 |
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New Quantaray High Speed Telephoto zoom lens 70mm-210mm $95.99 |
