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Why is my Nikon D90 taking very long exposures and showing “Job nr” in M/A/S/P modes?

My Nikon D90 takes very slow shutter-speed shots in Manual, Aperture Priority, Shutter Priority, and Program modes. After the exposure, the camera pauses for around 10 seconds and sometimes shows “Job nr,” then the photo

How do I calculate focal length for a 1 m × 1 m field of view at 10 m distance?

I want to estimate the focal length needed to frame a 1 m × 1 m subject area from a working distance of 10 m. Sensor dimensions are: - diagonal: 6.0 mm - horizontal: 4.8 mm - vertical: 3.6 mm Lens focal length range is

What does satellite image resolution like 50 cm, 1 m, or 5 m mean?

I’m looking at sample satellite images with large pixel dimensions, such as 11,000 × 9,000 pixels, and they list resolutions like 50 cm, 65 cm, 1 m, 1.5 m, and 5 m. What do these resolution numbers mean in practice for a

What’s the difference between the Tokina 12-24mm f/4 and the Tokina 12-24mm f/4 II?

I’m comparing the Tokina AT-X 124 AF PRO DX 12-24mm f/4 and the Tokina AT-X 124 AF PRO DX 12-24mm f/4 II for a wide-angle DX/APS-C setup. Aside from the updated lens coating, are there any meaningful differences between

Can Canon EF and EF-S lenses be used on an EOS M / EF-M camera?

I have Canon EF and EF-S lenses from a Canon 40D and I'm considering an EOS M camera with the EF-M mount. Can my existing lenses be used on an EF-M body, and will they retain normal functionality?

Where should an extension tube go with an EF lens, EF-EOS M adapter, and EOS M camera?

I’m using an EF lens on a Canon EOS M camera with an EF-to-EOS M mount adapter, and I want to add an extension tube for closer focusing. Does it matter whether the extension tube goes between the EF lens and the adapter,