Red Cherry Shrimp

by fahad.hasan

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0

What f stands for in the f-stop values f stands for the focal length of the lens. An f/1.8 lens has the entrance pupil diameter of D = f/1.8. An 85 mm lens at f/1.8 aperture will have the entrance pupil diameter of 85/1.8=47.2 mm. A 24 mm lens will have the pupil diameter of 24/1.8=13.3 mm. Since the amount of light passing through the lens is proportional ...


0

If you know the daytime brightness for a properly exposed scene, and the nighttime brightness, you can just calculate how many stops difference between the two you have and set the night aperture accordingly. Say, 2048lux day, 64lux darkness = 5 stops difference. (log2(2048)-log2(64)) I don't know how focus comes into this, though, that wouldn't change ...


0

Making the aperture smaller (F/2.8 is smaller than F/1.4) will cause increased depth of field, a darker exposure, and in some cases will result in increased sharpness. However, making the aperture too small can result in diffraction which makes the image softer. Also, small apertures result in starbursts from light sources if that's what you're after.


1

Open aperture metering also allows open aperture focusing, which is perhaps even more significant. The wider a lens is opened, the faster and more accurate a phase detection auto focus system can be. Note that open aperture metering became popular well before digital cameras hit the mainstream market. It became popular when automated focus systems started to ...


5

Legacy lenses tend to have a mechanical and or electrical coupling that tells the camera where the aperture ring is set without actually stopping down, so the meter in cameras built for this can take a reading at full aperture, do a quick calculation based on the selected f number. When you press the shutter release, the mechanical linkage causes the ...


0

Surprisingly, fixed aperture lenses are actually the most popular in the world. Every mobile phone has a camera witch such lens, and there are far more mobile phones than full-size cameras.


0

In the D3200, the aperture cannot be changed while in live mode. All the above applies as long as the camera is not in live mode.


0

Well, if you're using monolights, backing down to speedlights might be the best way to reduce power, particularly since you're working with a subject so close to the backdrop. If you're working with the lights in very close, say for macro/food/product shooting, possibly switching out to LED panels would make even more sense. The second thing to try would be ...


0

I think the aproach will depend on several things, if the light is soft or harsh, if the overexposed ilumination is over all the scene or just a part of it. ND Filter If it is over all scene you can try using a ND filter. If you use a 4x ND filter you can reduce the exposure from f22 to f11 or with a 8x to f8. Probably a polarizer filter will do if you ...


1

I'm afraid what you are describing sounds like a physical problem with the camera or lens. There is a metal lever on the back of a D lens that closes the aperture, and it should move freely. It sounds like either the camera is not moving the lever properly, or that part of the lens mechanism is broken. You could troubleshoot the problem by testing the ...



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