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by Jon

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5

They're red LEDs under the cover. I removed the cover from my 430 EX and whilst it works better (with all lenses, on account of producing a brighter, sharper grid pattern) the light is still red. Here's what it looks like without the cover: It's worth noting that you can in theory remove and replace the cover as necessary but I snapped one off the clips ...


4

I'm not party to any engineering details and haven't yet used the lens so this is purely speculation, however... The Canon 100-400 (a first party competitor) was originally released in 1998, it's likely that since then manufacturing methods and designs have improved considerably allowing Tamron to produce a lens of good quality for a lower price. Obviously ...


3

The short answer is yes, they are trustworthy but your question seems to be more orientated towards the 'should you go for the cheaper version' kind of area. In some cases, people would consider the Tamron/Sigma equivalent to be better, but that's subjective and can take into account many things such as build quality, features, price and of course picture ...


2

I am a Contax lenses user (on Olympus 4/3). Once you get the adapter ring, the usual way is to set the DSLR in aperture priority, step down the lens, focus and shoot. I have also tested my lenses on Canon. This is totally doable, however note that metering in Canon can be affected by the way you open your lens and may need a light compensation which depend ...


1

Nothing first person, but Photozone.de's tests and reviews are well regarded. Here's the relevant links: http://www.photozone.de/nikon--nikkor-aps-c-lens-tests/642-tamron175028vcdx http://www.photozone.de/nikon--nikkor-aps-c-lens-tests/838-sigma175028os To summarize: Build quality of both is good but not fantastic Neither is a great lens to manual focus ...


1

There's a focus limiting switch - so that when you're doing macro work, it won't hunt through the whole range. Look over the lens and find the switch and turn it off.


1

I have been able to try the Canon 2x III extender and Sigma 70-200/2.8OS combination and they do mount and autofocus on the Canon 70D and T5i. The resulting image quality, unfortunately, is beyond the scope of what I can test.


1

There are a few aspects to this question. Physical connection: will they mate up and connect to the camera and operate? Almost definitely, sometimes with some limitations (and occasionally with some extras: the Kenko teleconverters connect in with Canon lenses and allow them to autofocus at F8 instead of F5.6, although I found the actual use in the field ...


1

Hard to tell. Canon's 2x III teleconverter includes a rubber extension that fits in to the back side of a lens mounted on it. This is used to block out excess light (that would have been for the outside edges of the image) from making it in to the teleconverter. It also likely would not support full electronic control of a third party lens. To maintain ...



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