SQLGuy

I mean it's a smaller effective aperture opening than F8. The number is bigger, the opening is smaller.

I don't have an A7III, but it works pretty well on my A7R2 with the MC-11. AF is fast and accurate enough. The only issue is that you shouldn't use Multi metering mode at the wider end, because ...

Depending on what he's using for a trigger, a Minolta 3600HS(D) might be an option.

Not really. It's about $200 more than the A6000 was when it was introduced... five years ago. The A5100 is a different story. LCD-only E mount seems to be a thing of the past. The cameras E mount ...

Yeah. Sigma is weird about what they officially support vs what actually works. Officially, the MC-11 (for EF) only works with Global Vision lenses. What actually works is pretty much all EF ...

Sadly, watchmakers don't use this type. They either use a type that has a C-clamp-ish frame to grab the screw from both sides of the plate in which it's stuck, or they soak a plate in alum or ...

Yes. A 2X TC will add two stops. Doubling the  effective aperture number. F5 becomes F10, which is > F8.

I think it is broke. It seems to be out of time between the rangefinder coupling and the bayonet. I cannot mount the lens on my Contax II at all. I can mount it on the Contax to E mount adapter I ...

The 150-600 is F5 - 6.3, just like the 100-400. That makes it > F8 wide open at the short end with a 2X, which means no PDAF, and cameras that can't do anything but PDAF are then limited to manual ...

Sorry, I think I wasn't specific enough. I'm talking about the Sigma TC-2001 (10 elements, 5 groups) that is supposed to be matched for this lens. I've looked for reviews, but, so far, all the ...

The SEL28F20.

For about $20, I could get one of those FD/EF adapters with the registration correction element in them. Maybe with that element I could make an adapter to increase the registration enough to fit ...

The elements need to be cleaned, and there's oil on the aperture blades, so the lens will need to be fully disassembled anyway. Oil doesn't make these blades sticky, but it does make them shiny. I ...

ScotchBrite is quite abrasive and has a pretty high hardness. Did you mean to say something with a very fine grit? This lens' barrel is aluminum, BTW, I think.

You don't want HSS, and you won't need it. You have options of fairly fast shutter speeds and, more importantly, small apertures, to reduce ambient light. HSS is needed when using flash with large ...

Convenient excuse, and a good way to push more people to v3 cameras. Sure, things like "realtime" eye AF probably can't be done, or done well, on the older cameras, but things like setting the ...

Hi folks, Currently I have both the 100-400 and the new 70-200 2.8. The 100-400 is F5-6.3, so the 70-200 + the Sigma 2X would be at least as fast throughout the equivalent range (pretty sure the ...

That sounds like focus peaking.

The XT-3 is $500 more, and still no IBIS. But it is shaped like a little DSLR, and it has film emulation... and, more seriously, probably a better EVF.

If it's really an A5100/A6000 replacement, it should not have IBIS.