Spring 2012

Spring 2012
by ani

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8

It looks like a Chinon 40-150mm f/3.5 zoom, correct? In either case, those are focus marks for infrared photography. Infrared light will focus at a different point than visible light, so if you want to make infrared pictures you'll use one of the red markers instead of the white mark for the focus scale. There are multiple red marks because the IR focus ...


7

There are many contributing factors: Longer focal-lengths require faster shutter-speeds to reproduce details sharply when hand-held. The general rule-of-thumb is 1 over the effective focal-length of the lens. So a 300mm on a DX camera has an angle of view equivalent to 450mm and so you should expect 1/500s at least to get sharp images. The solution against ...


6

Hate to say it, but you're unicorn-hunting. There is no such beast. Understand that you're shooting a camera with a 2x crop factor. So, a "normal" lens is 25mm. And if you're looking at all classic film-era lenses to adapt to your camera, you're also looking at lenses from an age when 24mm was an exotic super-wide lens. And when f/2.8 was pretty much the ...


5

Sensor dimensions don't matter. F-stop is shorthand for "fractional" and what it's a fraction of is the lens focal length and the diameter of the iris and the real calculation is simply the lens focal length / diameter. 50mm lens with an iris 25mm across is at F2. So in your case, if you know the Radius then it's simply FStop = FocalLength / (Radius * 2)


4

F-number equals the focal length of the lens divided by the diameter of the entrance pupil. Since both measurements are linear dimensions when the same units of measurement are used for both the focal length and the diameter of the entrance pupil then they cancel each other out without any further conversion. If the measurement units are dissimilar then ...


4

Does this make the lens better than an L Lens? It all depends on what way you mean when you use the word "better": Sharper at common apertures and focal lengths? At the center of the frame or over the entire field of view? Less chromatic aberration at a particular focal length and aperture? Less light falloff at a particular focal length and aperture? ...


4

No. It's not a mount issue—it's a glass issue. Sigma's mount conversion is to change between different mount systems so it will physically mount and electronically communicate to the system of your choice. Canon EF and EF-S lenses are actually still in the same mount/signaling system. And chances are good your 17-70/2.8-4 will actually mount and ...


3

This and all similar questions are best answered by looking at websites designed for the purpose. One approach is to look at vendors like B&H Photo, which offers convenient filtering. For example, Canon EOS EF or EF-S lenses classified as "wide" or "wide zoom" with an aperture of f/1.4. Or, use a website dedicated to the task, like the Neocamera database....


3

Those markings are for focusing infrared. Infrared light focuses at a different point to visible light. It will also vary with zoom length. To focus at infrared on that lens you would select the mark witch matches the zoom you are using. Then you would match this mark with the correct distance from the focus ring above.


3

I think you forgot one really basic thing. Image quality. You may want a side-by-side comparison of the much older D design to the digital-era G design on a full-frame camera, such as this one on the-digital-picture.com, where the two lenses are tested on a D3x. In that comparison, mousing over the test chart crops will switch between the two test setups. ...


3

"...all Pro FX bodies have AF motor built inside the body. Hence, SWM in 'AF-S' lens is redundant." Not necessarily. The performance of camera based focus motors and lens based focus motors is far from identical. SWM lenses tend to focus faster and more quietly than their non-SWM counterparts. Add the mechanical interface between the body and lens and the ...


3

It is normal to hear some clicking sound by shaking a lens, because of AF mechanism. Zoom lenses and VR make more noise because they are made of moving parts.


2

Yes, you can use a wide, manual focus, large aperture, prime lens for both astrophotography and landscape photography. You can use just about any lens to capture landscape photography, it depends on the vision you have and the scene; but a lens such as the one you described will give you many opportunities for landscape photography and it will capture them ...


2

Don't know exactly how useful this might be but Roger Cicala's lensrentals blog has comparison teardowns of the Canon, Nikon, and Tamron 24-70/2.8 lenses with lots of pictures. Quoting the Tamron relevant text from that article: Front Group One thing that all 3 of these lenses have in common is a large front group at the end of an extending barrel. ...


2

I like to know is there a binocular which uses binocular lenses as camera lenses to take picture There are binocular cameras like this Vivitar model that let you record what you see when looking through the binoculars. There are also adapters for various kinds of cameras that let you take a photo through one of the eyepieces. ...and show pictures live ...


1

Assuming your 18-200 lens has a 77mm filter ring, then you don't need anything else to make it fit. :) If you just wanted confirmation that you are suggesting a good filter: yes, it is.


1

Contax/Yashica mount lenses can be adapted to Sony E-mount (not A-mount) and Panasonic/Olympus micro four-thirds and other mirrorless cameras, as well as Canon EOS-mount dSLRs. They cannot be adapted to Nikon F mount dSLRs with simple rings because of the flange distance issues, but you might be able to replace the mount with a Leitax kit; however the cost ...


1

If your lenses are for a Canon EOS they should be EF mount and they should work on Canon EOS dSLRs.


1

Inkista's answer is comprehensive. That being said: I have an Olympus E-P5 MFT camera from 2013, and I have bought an adapter for my old OM-mount lenses that I use occasionally. Initially, my thought process was similar to yours. Experiences: Good adapters cost as much as a new kit lens. You can buy cheap adapters on Ebay. No matter what, a full-metal ...


1

Krasnogorsk-3 has a Pentax M42x1 mount, though may be some models with Krasnogorsk bayonet mount. The lens mounted is the Meteor 5-1. f1.9 /17-69mm You can mount the M42 lens in mirrorless cameras, with the appropriate adapter. This lens was designed for 16mm film, so there are considerations using it on bigger frames. Seems not suitable for SLR as the ...



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