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Extremely Sharp -- TC Use knocks off a star

Started 11 months ago | User reviews thread
OP Karl_Guttag Senior Member • Posts: 1,883
Re: Extremely Sharp -- TC Use knocks off a star

kristian1 wrote:

Karl_Guttag wrote:

kristian1 wrote:

Well in this conditions you are not gaining anything with using tc , it would be better with bare lens to have 100mm and crop the 500mm shots.

Kristian

Obviously, I would be gaining resolution by 1.4x in each direction if I could use the TC. I went through thousands of pictures with the RF100-500, but none were in the 100-140 range. A 1.4x TC would center the focal length range where I want it most.

Optically, the TC combination is very good, with very little loss from using the TC. While it would be extremely difficult to prove it, I would assume that the focus would be better without the TC, so there is that gain in not using the TC.

The glass half full side would be that the 100-500 is like having a 1.25X on the long end over a 100-400.

My original reason for pointing this out is that it is a significant limitation of an otherwise excellent lens.

This is true , but I wrote about your cinditions , the heat haze is limiting the resolution you can get.

Kristian

I agreed on the heat haze issue with the B29 shot at 700mm, and I should have been clearer that I was only using it as an example of the dynamic focal length range in a sequence of shots. While the heat haze was limiting in that shot shooting down the runway, there are other cases where it is not the limiting factor. Soon after this experience, I put the TC away.

 Karl_Guttag's gear list:Karl_Guttag's gear list
Canon EOS R5 Canon RF 15-35mm F2.8L IS USM Canon RF 24-70mm F2.8L IS USM Canon RF 70-200mm F2.8L IS USM Canon RF 24-240mm F4-6.3 +14 more
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