Is f/4 to 5.6 a big problem on a canon L lens?

Hi, I just want to buy the canon 70-300L, but people said that the aperture f/4-5.6 is a big problem. So what do you think? I have a canon t6s

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ISO in live view window. Nikon d5300?

So I bought a nikon d5300 hundred recently and I am learning how to use it. One thing I noticed is that when I adjust the iso there is no change in what I see until I take the picture. So i was wondering if there was a way to make it so these adjustments show up in the live view window?

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How much can a boxed CANON AE-1 sell for?

My grandfather bought it new back in the days when film was the main biz. He never used it because he was more of a Pentax and Nikon guy. How much can it fetch?

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