 The Canon G9/G7 has a focal range of 7.4mm to 44.4mm, or the 35mm film equivalent of 35mm to 210mm. The camera records actual focal length, a number between 7.4mm and 44.4mm To convert actual focal length to film equivalent, multiply by 4.73. To calculate the focal length with a given teleconverter, multiply the cameras focal length by the power of the converter. For instance, the G9/G7 at full zoom is 210mm, x 1.54x (Raynox DCR-1540) = 323.4mm. We've listed focal lengths in 35mm film equivalents because that's what most users are familiar with.
In this test, we've included some of the more popular teleconverters, including two Canon converters designed for other cameras. We were unable to test the Canon TC-DC58B which was designed for the S2/3 because the G9/G7s lens crashes into it at the full tele setting.
The telephoto samples below were taken using the Lensmate 52m and 58mm lens adapters and the teleconverters described below. The first image of the pair is taken with the camera at full telephoto zoom.
The second image is taken with the camera zoomed back to the point at which vignetting begins to appear to demonstrate the actual useful zoom range of the converter. As the lens is zoomed back to the wide angle setting, the corners darken and eventually the image becomes circular.
To evaluate these images, be sure to open the full size (actual pixels) image, or click rectangle for quarter crop to reduce download time. Almost all the samples look good in the center, so be sure to check the edges and corners as well.
Camera settings are as follows: (in case you can't read the exif in the full size images)
ISO = 80
Aperture f4.8-5.
Ev - 1/3
White Balance – Sunny
Contrast –Low
Saturation – Low
Sharpness – Low
Image Size – Large
Jpeg compression - Superfine |
