Going To Forest Safari. What Zoom Lens Should I Take?

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3 Responses

  1. Sheeba says:

    Have you reviewed the Canon PowerShot SX 40 HS ? Considering a purchase, but haven’t found too many independent reviews.
    My SX20 IS, again, has the ‘lens error’ message as last year; since it is out of warranty, plan to take it to a reputable camera shop a few towns over.
    Thank you for your help.

    Sheeba C

    • Rajib Ghosh says:

      Dear Sheeba,
      I have not persoanlly tested the SX40 yet. But from what I have read, it is a worthy successor to the SX20 and SX30.

      Apart from the 35x optical zoom (same as SX30), it features a CMOS sensor (versus CCD sensor of SX20 and SX30). The CMOS sensor allows images with lower noise, particularly in low-light situations.
      Also, the new Digic 5 processor enables the camera to capture Full-HD videos (1920 x 1080 pixels) versus the HD videos (1280 x 720 pixels) of it’s predecessors. In a review of image quality (in a reputed Photography mag), the reviewers lamented the lack of fine detail in (when compared to a DSLR) but rated the camera top overall among it’s competitors (Nikon P500 and other super-zoom cameras from Olympus, Fujifilm).

      I had found little reason to upgrade to the SX30 when it was launched, but should my SX20 die (of lack of use), I will surely pick up the SX40 without debate. FYI, I also purchased a Nikon D5100 DSLR but the SX20 remains my preferred travel camera.


  2. qrk says:

    Nice tutorial on figuring out focal length required. In your examples, you don’t need to use crop factor correction since you are using the actual physical dimensions of the sensor. Thus, in your example of the “kid at soccer game”, you will need a 300mm (actually, 335mm) lens, not a 200mm lens. If you were using the dimensions of a full frame sensor, then you would need to use crop factor correction if shooting with an APS-C sensor.

    Your example of the SX40 shooting the crocodile, at a range of 50 feet, the 19.6mm focal length is within the actual focal length of the camera which is 4.2 to 148mm. In your example, you used the actual physical dimensions of the sensor (a good thing). What you should have done is multiplied 19.6 x 5.6 (crop factor) = 110mm which is the equivalent focal length required for a full frame camera.

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