FoCal has a chart with recommended distances (you can use less then 50 x for longer telephoto lenses.A FoCal target - either a FoCal Hard target like the one supplied in the box or available from the FoCal Store, or a target image printed on quality paper. I think you should move the camera/lens/tripod to 50 x lens FL mm for whatever the zoom is (so for the 24-70/f2.8, set-up at 4 feet at 24 and 11.5 feet at 70). Review: Reikan FoCal Pro AF calibration softwareYou should have the green check. The following target images are available for download (also supplied in ZIP and DMG packages with FoCal software): Standard Target - Vector PDF (can be scaled to any size and keep highest quality) Standard Target - 600dpi PNG (use for printing if the PDF is inappropriate) MultiPoint Focus Target - Vector PDF (can be scaled.
What Chart Should I Use Reikan Focal How To Go About
The increments normally take the form of + or - adjustments, on a scale of 20 units either side of 0 or neutral (+20 to -20).Reikan offer a software based solution to autofocus calibration called FoCal. The problem typically is how to go about finding what increment to dial in. It contains all the information you need to download, install, setup and run a calibration with the software.Most SLR cameras offer the option of fine tuning the autofocus accuracy somewhere in the menu system. One area that this is perhaps most noticeable in, is the autofocus accuracy.Reikan Technology Ltd Reikan FoCal 2.13 3 Purpose of this Manual This manual is intended to provide a basic overview and get you started with Reikan FoCal. It is a little known fact that most cameras and lenses are all very subtly different, even within the same model, and so will behave (again subtly) differently on different bodies. Looking at the example above -horizontally the scale runs from -20 to +20, and the vertical scale is an indication of the sharpness of the image, so the higher a marker the sharper the image.The advent of super high resolution cameras has forced people to re examine their lenses, both in terms of performance and compatibility.
Each is supplied with high resolution pdf and png targets that can be printed off for the tests.Purchase is via download, and if the software is to be used on a Mac, also requires the download and installation of the Mono framework in order to function. The latter two offer an automatic option, with the Pro version offering additional test options and more control of the testing process. Purchase and Installation:Reikan offer three versions of the program, Standard, Plus and Pro. The software then analyses the images and “chooses” the setting that gives the best results.
The software currently only supports Nikon or Canon cameras. I believe that this can be changed at a later date if required. Once installed, it prompts for activation via a key that is supplied via email.Once installed and activated, the user need to specify whether it will be used with Nikon or Canon cameras via the preferences.
If it is in an incorrect position, it uses arrows to suggest the movement direction to correct this. The utility displays the camera’s LiveView image, and adds “Target search” that identifies and lets the user know that the target is correctly positioned relative to the camera. Semi-Automatic AF Microadjustment Calibration.The first task is to use the Target Setup utility to check that it will work effectively with the test. Fully Automatic AF Microadjustment Calibration.
Testing lensesI ran the test in “Fully Automatic AF Microadjustment Calibration” mode. You do need to be prepared to move the camera and tripod to accommodate different focal lengths, although for underwater use, with mostly wide-angle or macro lenses this is perhaps less of a problem. Printing it at a larger size cured this however.
If it gets an erroneous result, the user can click on this result to remove it from the test.The camera I was calibrating (Nikon D810) will not allow the AF Micro focus adjustment to be controlled via software, so the program prompted for me to manually adjust it as required. As I was using the Pro Version, it graphs each set point and creates a curve representing the AF performance. FoCal does not display the RGB results by default, but can do so by accessing controls if required.The test itself consists of the program shooting a series of images at different AF micro focus adjustments, seeking the level that gives the sharpest image. The values are combined with a reading of the total amount of light that is falling onto the target, so that if there is a color shift due to the type of light that is present during the test, this does not skew the results.
Possibly due to a combination of the testing environments and the lens itself, this proved harder to get a reliable result.One nice feature with the software is that it automatically stores the AF correction with the lens profile in the camera. I also used it to calibrate some land lenses, including a Nikkor 70-200 f2.8. It should be noted that this does not imply that the lens (or camera) are in any way faulty, simply that the combination requires this setting in order to offset minute manufacturing tolerance differences.With all typical underwater lenses (macro and wide-angle), the software worked very well in auto mode. This was entirely automatic!Each lens took around 5-6 minutes to test, with the Sigma 15mm f2.8 (with my D810) requiring the largest amount of adjustment at +6. On a couple of occasions, the software found that it was not getting consistent results and hence prompted for additional settings to be tested. These can be stored in the camera, and will automatically become default settings when the lens is used.
It has built in functionality that ensures that the targets is set up correctly. If you are shooting any camera with 20+ megapixels, it is likely that lens calibration will improve your images.The software is simple and quick to use and seems to provide reliable results. It will also show if a lens is not calibrated. ConclusionHigh resolution cameras will really show when a lens is not performing correctly. I have only tested Nikon cameras, and do not know if this extends to Canon cameras too, but would imagine that it does.As can be seen above, the Pro version has lots of other functions, however, for most people the lans calibration is probably the primary and most important tool.
FTTC statementThe reviewer purchased the review software. Via download, the program is priced at £19.95 for the Standard version, £39.95 for FoCal Plus and £69.95 for FoCal Pro.
0 kommentar(er)
