Friday, 26 August 2016

810 + 14

Recently I've received my new Nikon D810 and my new SAMYANG 14mm F2.8 ED AS IF UMC, a winner combination for landscapes, I hope.


I have to test them deeper, but I'm very happy with the first results.

Comparison between my old camera (Nikon D7000) and my new camera (Nikon D810), by DXOMARK

Yesterday I took a little tour for my neighbourhood and also took a lot of pictures with my new gear. The pictures are not very special, but they are only a test. I liked the soft shooter of the Nikon D810, the very high image quality (36.37 MPx), the sharpness of the SAMYANG lens, the wide angle of the combination "14mm + fullframe", the behaviour with high ISO, the ISOs below 100 for silk effect, etc.
















I promise to bring more pictures soon :)!

Saturday, 20 August 2016

Landscapes: mathematical considerations about focusing and exposing

Recently I've bought a new lens for my collection, a SAMYANG 14mm F2.8 ED AS IF UMC. I think it could be a excellent choice for landscapes and night photography. It has been shipped while I am making my first calculations.

One of the most famous 'tricks' in landscape photography is the use of the hyperfocal distance. In my other blog, Astaroth's World, I wrote about hyperfocal previously but, What is the hyperfocal distance? Wikipedia says:

"The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. When the lens is focused at this distance, all objects at distances from half of the hyperfocal distance out to infinity will be acceptably sharp."

Focus to the hyperfocal distance is a method to have a very large depth of field, and so, it's perfect for landscapes.

Source: DOF Master
It depends of focal length (the lens), the f-number (the aperture) and the circle of confusion (a parameter of the camera related with the range that you can consider that something is in focus in a approximated way).

I've made a table with the main situations for landscapes photography with my current photographic gear (for Nikon D7000, CoC: 0.02 mm).




Everything is cooler in a graphic:


The dependence with de focal length makes that shorter focal lengths have smaller hyperfocal distances. It means that you can focus nearest with short focal lengths and you will have in focus until the infinity.

Other interesting point in landscape photography and, mainly, in night photography, is the equivalent exposition when we change the ISO or the f-number. Night photography usually means long exposure photography. A trick is to take a picture at very high ISO as preview. If you like that image, you can repeat it with an equivalent exposure and a less noisy ISO.

The calculus of the exposure time for a different ISO is very easy:


The f-number have a direct effect in the depth of field and in the hyperfocal distance, so to know how depends the exposure with f-number could be so important. The calculus about this is a little harder (you can also view it in Astaroth's World, previously posted):


Summary


The theory is in the above lines. Now, it's time to practice! I hope to bring soon you more interesting pictures of landscapes and the night with the new gear.


Appendix


I've recently received my new camera: a Nikon D810. This camera has a circle of confusion of 0.03 mm and it affects to the above results. I show the new tables for Nikon D810 below.




I hope to be useful.

Saturday, 13 August 2016

Night falls in the darkest town

Poyatos is a very little town (population in 2015: 67) of Cuenca (Spain). If we observe a light pollution map, we'll notice that light pollution near there is very very low.

Source: http://djlorenz.github.io/astronomy/lp2006/overlay/dark.html

Source: http://www.lightpollutionmap.info

We decided to take a tour for there to observe the night sky. It's time for perseids!

When the night finished, we hadn't taken good pictures of perseids, but we had some beautiful night pictures that I would like to show to you.









As appeared in Men In Black film:

- They're beautiful, aren't they?
+ What?
- The stars. We never just look anymore.
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