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R5+100-500+1.4x or R7+100-500?

Started 8 months ago | Questions thread
Robbey TC
Robbey TC Forum Member • Posts: 82
Re: R5+100-500+1.4x or R7+100-500?
2

The 1.4 TC reduces the amount of light hitting the sensor by half, or one full stop. (1.4^2 approximates 2)

The 1.4 TC on a 100-500  f4.5 to f7.1 means that you will be either shooting between f6.3 @ 100mm to f10 @ 500mm, or have to double the ISO or halve the shutter speed for each stop foregone  (or a combination to achieve correct exposure).

When the R7's FOV is at 700mm (actually between 580mm to 755mm), with the 100-500, the maximum f-stop is f6.3 . This is 1.3 stops better than the R5 with a 1.4 TC  will achieve for 700mm (f10). (The R7 moves to 7.1 above 755mm FOV and the R5 moves to f10 above 660mm FOV ...(1.6 vs 1.4 comes into play))

So in the end it's a choice between reducing the $5,000 lens's capabilities (IQ, fstop, speed and ISO) to gain 700mm reach. While 800mm  reach is achievable, with better IQ, ISO, fstop and shutter speed, on the R7 for an extra $1,200 above the TC's cost.

Choices... choices

Rob

 Robbey TC's gear list:Robbey TC's gear list
Canon EOS R7 Canon RF 100-500mm F4.5-7.1L IS USM Canon RF 50mm F1.8 STM Canon RF-S 18-150mm F3.5-6.3 IS STM
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