Photography in Sabah

The most important parameter for the lens is the horizontal field of view compared to the focal length and crop factors. These are just estimates of the real capability of the camera and will introduce errors if wrongly entered. The formula for the hfov is . d is 36mm for a full frame film camera, but the sensor for a Sony full frame is only 35.8mm so be careful when calculating the field of view of the Sony full frame cameras. The sensor size of the Sony APS-C sensor used in the Sony E mounts is 23.5mm.  If the lens is 16mm, the hfov should be 72.5 degree. For a full frame 24mm camera, the hfov is 73.7 degree. My Sony E camera taken with 16mm focal length setting has an hfov of 73.7 degree, equivalent to a 24mm full frame. The cropfactor for the Sony Nex3N is therefore 24/16 which is 1.5.

They both use lensfun library but can only detect the older version of lensfun, not the latest version called 2014-09-30 Release 0.3.0. You can use the data in that release but must modify them by inserting them into the lensfun library that comes with Gimp lensfun plugin and Ufraw. You must make the following changes: Incompatible lines: <lensdatabase version="1">         <mount>Sony E</mount>         <mount>Fujifilm X</mount>         <mount>Samsung NX</mount>         <cropfactor>1.534</cropfactor> Change them to: <lensdatabase>         <mount>Sony E</mount>         <cropfactor>1.5</cropfactor> and copy them to the .xml files where camera definitions are made. For my Sony E, I them in mil-sony.xml. The same lens database needs to be copied to the other camera xml files. These parameters can be calculated easily using Hugin as I had mentioned at the previous post. The most

http://vimeo.com/51999287 The video above is the best tutorial in how to find the parameters to calibrate a lens using panotools that gimp, ufraw and hugin uses. For gimp 2.8.14 , you need to install the plugin gimp lensfun at http://seebk.github.io/GIMP-Lensfun/ The problem with Gimp is that I still don't know how to do conversions for a large number of files. It can only do corrections for one file in jpeg, not raw. Only ufraw can do raw but the latest ufraw, the standalone version, cannot work with large raw files that my camera can handle, greater than 16 Megapixels. Lightroom is still the best and most reliable but its adjustment is limited and it is expensive to buy legally, whereas Gimp and Ufraw are free.

It is easy but troublesome because the documentation is not complete and actually wrong. I need to do a lot of trials and errors before I managed to use the generated profiles for my own use. Download the free software Lens Profile Creator 1.04 below: http://www.adobe.com/support/downloads/detail.jsp?ftpID=5489 Follow the instructions in the documentations directory of the installation file. There is no installer required. Just copy the execution file and paste at the desktop as a shortcut. The instructions should be easy to follow because they are provided with pictures. The generated profile file ending with .lcp cannot be read by Photoshop Lightroom because of this entry: <stCamera:CameraRawProfile>False</stCamera:CameraRawProfile> Change the "False" into "True": <stCamera:CameraRawProfile>True</stCamera:CameraRawProfile> There are a few quirks of the profile parameters:  <stCamera:Make>SONY</stCamera:Make> is

Once you start photographing using raw files, you'll need to process your photos first. Sony has its own software called IDC, Image Data Converter. I used it initially to convert my raw files to jpeg files for normal viewing. IDC is powerful but not so user friendly. Selecting a large number of files is slow because you have to select one by one or use the shift key and cursor keys to move the select marker. It also does not have a lot of options to process each image especially in lens correction. Lightroom is difficult to master but once you do the tutorials such as the link below, it become so easy and productive. The most important of which is the lens corrections. The camera calibration has some effects but I am suspicious of its effects. I prefer profile lens correction because the corrections are tagetted to a particular lens type. http://www.digitalcameraworld.com/2013/06/22/adobe-lightroom-presets-how-to-make-your-photos-stand-out-and-save-time/ The tutorial above

The numbers refer to the number of lines x 100 for the whole vertical. If the number 10 is the shartest lines that we can distinguish, it means that the number of vertical lines for the chart is 10 x 1000 which is 1000. Please note for a full hd TV, the number of vertical lines is 1080, which is why FHD is also referred to as 1080p, p represents full lines instead of interlaced lines, labelled is 1080i. The usual camera sensor has an aspect ration of 3:2, i.e. 3 times for horizontal, 2 times for vertical. So if the vertical is 1,000, then the horizontal should be 1000 / 2 X 3, which is 1,500. This is equivalent to a picture of 1500 x 1000 pixels, or 1.5 Mpixel. Modern cameras can show much higher resolution than just 1.5Mpixel. For the ISO12233 chart, the higherst number of lines is only 20 x 100 which is 2000 equivalent to a FHD picture. To be more realistic, 3000 x 2000 pixels which is just 6 Mpixel. To increase the resolution handling of the ISO12233 chart, I stack 3 of

I am actually disappointed with the Samyang Lens. I bought one for my Sony Alpha 5100 camera. I bought it mostly for the perceived better resolution compared to the kit 16mm-50mm lens that comes with the A5100 camera. It turned out that their resolutions are the same. The only advantage is the F2.0 aperture and 98 degree hfov of the lens. However since it is a manual lens without OSS, it is much harder to use so only useful for special functions. The 16mm lens with an hfov of around 90 degree is sufficient for most of my uses. The Sony SELP1650 is very small as well. Camera Lens Aperture Pixel/V P Mpixel Sony A5100 16-50mm F3.5-5.6, ISO100,50mm 8 3000 13.5 Sony A5100 12mm F2.0,ISO100 2 2400 8.64 Sony A5100 12mm F2.0,ISO100 5.6 3000 13.5 Sony A5100 12mm F2.0,ISO100 8 3000 13.5 Sony A5100 12mm F2.0,ISO100 4 2700 10.935 Sony A5100 12mm F2.0,ISO2000 5.6 2700