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Focal length equivalents

My Fuji S602Z lens (not-detachable) says 7.8-46.8 mm (it also says 1:2.8-3.1, which is Greek to me). The range of 7.8-46.8 makes sense, since the camera is a 6x optical zoom, but what would be the equivalent of 7.8-46.8 mm in standard SLR lens?. I bought a Fuji 15x tele conversion lens that attaches to the camera lens on an adapter ring that says 55mm and got great photos of wildlife on an African trip 3 years ago -- better than people with Nikons. Now I want to go to a DSLR with more resolution and get a telephoto lens with an equivalent focal length. The question is: what focal length was I shooting at in Africa? Would a 75 mm 300 mm zoom be equivalent?

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Do you know the sensor size of your Fuji? When we say equivalent it means to be equivalent to a standard 35mm film camera or a full-frame size 35mm x 24mm digital camera. Most digital SLR use a smaller size sensor to reduce the cost and the size of the lenses. For example, a 24mm x 16 mm size sensor. Hence, the equivalent need to times a factor, for example, 1.5x for Nikon (because 36/24=1.5), 1.6x for Canon DSLR. A 18-105mm standard zoom lens on Nikon D90 will be equivalent to 27-158mm lens on standard 35 mm film camera or full-frame digital camera. Most point and shoot small cameras and super-zoom lens cameras (all with not-detachable lens) use a even smaller sensor which has a factor of 5x or 6x. So, you may need times 5x (to 7.8-46.8)
The 1:2.8-3.1 is the F number (aperture). It means at 7.8mm focal length, its biggest aperture is 2.8 which you will have a hole with diameter of 7.8/2.8=2.78mm; while at 46.8mm, its biggest aperture is 46.8/3.1=15mm. These two numbers: 2.8 and 3.1, the smaller the better which allow more light coming in for good low-light condition pictures.

Posted on Jul 08, 2009

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Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";}I believe it is equivalent to a 35 to 210mm lens on a 35mmcamera. If you are considering a Nikon such as the D60, D80, D90, etc.,the standard lens sold with the camera is 18-135mm. This is not the sameas an 18-135mm on a 35mm film camera. The equivalent 35mm film cameralens would be 27-202mm (you multiply by 1.5), about the same as what youhave now. If I were planning to do wildlife photography, I would buy a usedNikkor ED 70-300mm AF lens on E-bay. You should be able to get one for$200 or less (the new price is $550+). This lens is designed for a 35mmfilm camera and is the equivalent of a 105-450mm when used on a Nikon digital cameras. Additionally, it is compadable with the automatic features of the Nikon digital camera bodies. This would give you an excellent portrait lens at 105mm and extra long reachfor wildlife. The fast shutter speed and stabilization circuit on thedigital camera should make it usable in daylight without a tripod. I havethis lens on a Nikon film camera and it is a superior lens. At a 1/1000second or faster shutter speed, I get sharp hand held photos.

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Hello, I own a Quantaray 28-90 MM zoom Macro lens. I would like to know its equivalent Nikon lens, which would be one of the following: 1) D or G type Nikkor 2) CPU Nikkor lens other than D...

This Quantaray lens is similar to a Nikon D-type lens in that it has an aperture ring. However, Nikon D- and G-type lenses communicate subject distance information to the camera using a proprietary protocol. Third-party manufacturers have to reverse-engineer the protocol, and they don't always get it right.

What this means for non-flash photography is that this lens works fine, with only minor exposure differences since Nikon's Matrix metering uses the subject distance information.

For flash photography, subject distance information is critical. My advice is to try it as D-type lens and look at the results. If they look good, fine. If they don't, try it as a non-D- and non-G-type lens (the second choice in your list).

The above assumes you have the Nkon-mount version of the Quantaray lens.

Jan 26, 2015 | Quantaray Camera Lenses

1 Answer

Why does my lens only zoom to 200

Could be, because most camera's only can auto focus till f/1:5.6. And if 5.6 is reached at the focal length of 200 mm, the camera stops it from going to a part it can't be focused.
Perhaps you try the lens in manual focus, and manual zoom.

Jan 28, 2014 | Sigma Zoom Telephoto 170-500mm f/5-6.3 APO...

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What is T Mount Telephoto Zoom Lens with 2x Teleconverter

The T-mount is a universal thread developed by Tamron which allows various adapters to couple a lens to a wide variety of camera brands. If a lens is listed as having a T-mount, it means that the lens can be coupled to your camera if you have a T-mount adapter for your camera.

A 2X teleconverter (often called a doubler) enables a lens of a specific to be doubled. For example, the lens referenced above actually is a 650-1300 lens but with the 2X teleconverter the focal length can be doubled to a maximum focal length of 2600.

I have an Opteka 600-1200 telephoto lens which I consider to be a decent lens for its very low price. I also have a doubler which came with my camera kit. That means I can increase the focal length of my lens to 2400 but I cannot imagine any reason to do so. At it's full zoom 1200mm focal length, this lens is very difficult to handle and must be used on a tripod with a remote shutter release.

It is extremely time consuming to focus and must be focused very accurately because it has almost no depth of field. At 1200 mm, the slightest breeze or vibration will cause the picture to go fuzzy from movement.

The lens is also large and does not fit conveniently in a camera bag so it rarely goes with me unless I know for sure that I will need it. It is not particularly good for sports action shots because the action will be over before you are ready to shoot the picture. With very bright light (such as the mid-day sun) and pre-planning and pre-focusing you might be able to get some interesting sports action shots. Say you're at an automobile race and you know a car will be coming into view at a certain spot, you can set up for that spot then trip the shutter when the car pops into view.

All that being said, I think this is a good lens to have in my bag without spending $10,000 plus for a really good lens of this size.

Feb 08, 2013 | Opteka 650-2600mm High Definition...

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If you had a compact camera it would say 10x zoom what is the equivilent in a 70mm -300mm tamron

A 35-80 mm lens is 2.3X zoom. Divide 80 by 35 and you'll get the result.

It is usually better to know what the focal length of a lens in "35 mm equivalent" is and judge by that, rather than relying on the "X" power of the lens. For instance, most point and shoot cameras start at about 35 mm and have either a 3X or 4X zoom. This would make it a 35-105 or a 35-140. I've seen some that start at 28 mm, though. A 3X starting at 28 mm is 28-84 and a 4X is 28-112. Neither one is a particularly strong telephoto lens and the 4X is just about the same as the 3X that starts out at 35 mm.

It's also important to realize that tradition dictates that lens focal lengths are usually expressed in terms of "35 mm equivalent," where "35 mm" refers to a 35 mm film camera. This is because of the relation between the sensor size and the actual focal length of the lens and the resultant angle of view of the lens.

I have one point & shoot that is actually a 5.8-24 mm zoom. This is a 4X zoom. The 35 mm equivalent is 28-116 mm. The sensor is 7.2x5.3 mm. (1/1.8") (And I wish I knew someone who could explain how the heck they came up with sensor size terminology!)

I have another point & shoot that is actually a 5.7-17.1 mm zoom. This is a 3X zoom. The 35 mm equivalent is 34-102 mm. "How could a shorter focal length give a longer 35 mm equivalent?" you might ask. It's because the sensor is only about 5x4 mm. (1/2.5")

I have a few Nikon DSLR's and - thankfully - they all have the same size sensor. They all have a "lens factor" of 1.5. This means that you just multiply the actual focal length of the lens to get the 35 mm equivalent and then you can make comparisons accurately from camera-to-camera. Most Canon's, for instance, have a lens factor of 1.6. On a Nikon DSLR, a 28 mm lens is the "35 mm equivalent" of a 42 mm lens. On most Canon DSLR's, the same 28 mm lens is the equivalent of a 45 mm lens.

These example are just to show you how freaking confusing it can all become if you try to make sense of the "X" power of a zoom lens.

Bottom line...

Check the 35 mm equivalent specifications for the lens. This way, you will be leveling the field and comparing apples to apples. More or less.

Jul 10, 2012 | Tamron 75-300mm f/4.0-5.6 LD Lens for...

1 Answer

Is there any possible way that this lens can be hooked up to an EOS? More specifically a Canon 7D?

The answer to this is Yes and No. Yes there is an adapter to take the FD mount lens which is Canon's Manual lens to an EOS mount which is auto focus. As much as these third party manufacturers claim comparability there is really no way you are going to have "good" results. Here is the No part. To give you infinity focus there must be a lens mounted in the adapter this lens no matter how good the third party says they are you loose light, focal length and sharp focus. Your F3.5 lens will loose at least a stop and a half because the light is traveling through another piece of glass, so you are looking at a lens that is now about F5 at the short end to F6 at the long end. About the focus because now this lens has become your rear element is is more critical to flaws then the front element, any imperfections in that piece of glass is now magnified it still works but the results aren't as good. Also the focal length of the lens has now changed. If you are installing this on an EOS l7D the focal factor would be 1.6 is some cases this would be beneficial but in most others you loose again, it will take that 35 to 70mm lens and give you the focal length equivalent 56mm to a 112mm lens. Yes Canon made these adapters for a short period of time to help the pro shooters and their high priced lenses get through the transition BUT those adapters were only made for the professional lenses that was F2.8 or faster.
Yes it will work to some degree but No it's not worth it specially if you are installing it on a New Canon 7D.

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1 Answer

My sigma 105 lens do not go to f2.8. it reaches only f3. tanx. macario sakay

If this is the Sigma 28-105mm f/2.8-4.0 as in the title, then the maximum aperture will vary with the focal length. It is probably only 2.8 when the focal length is zoomed to 28mm. It will be 4 at 105mm, and at focal lengths in between it will be in between.

Nov 17, 2010 | Sigma 28-105mm f/2.8-4.0 Aspherical...

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Does Tokina-12-24mmF/4Pro DX complies with Nikon-D3 FX Format

Barrel distortion like you describe can always be a problem, especially at ultra-wide focal lengths like yours at 12mm. Some of this can be compensated for in software... Adobe Photoshop CS2 and Elements do a reasonable job, IMO, Bibble Pro ( does even better, especially with the 3rd party plugins like Percy perspective correction. These are things we have to live with when we have smaller sensors and ultra-wide angle lenses. There is nothing wrong with your lens, you will probably find that this distortion is minimized if you use a longer focal length (say 14mm) and/or stop down the lens a bit.. try f8, wide angle lenses have huge depth of field.

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I am looking at a 400/640mm preset lens,

Pre-set depending on the model, can be fixed aperture, and or fixed focal length. You have to read the spec sheet to know, or call the dealer.

I have a fixed 500 mm / F8 mirror lens. It is refered to as a fixed lens, because nothing is adjustable. I have aperture and filter drop-ins to do the equivalent of some adjustments.

Jerry G.

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Trouble focusing with sigma 70-300 DL macro super lens

It will not focus on anything closer than 5 feet.

(From Sigma lens literature)
Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. It also has a switch for changeover to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing distance is 1.5m / 59 in. at all zoom settings.

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1 Answer

35mm Pantex Camera model # ME

That's the focal length of the lens. If there're two numbers, then the lens is either a zoom or a "vari-focal" lens, meaning the lens can change focal length from one end to the other. In this case, the lens can change its focal length from 150mm to 750mm, either by turning a ring or pushing/pulling a ring.

BTW I wasn't aware Pentax had a zoom that long. Are you sure it's not 75-150?

Dec 14, 2007 | Pentax Camera Lenses

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