Weather sealed RX1 with built in viewfinder.
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Ok, so I am look at the samples from cyberphoto.se, and the Sigma 2x converter looks considerably sharper than the Canon 2x III both at f/5.6 and especially at f/8. Do my eyes deceive me?
I tried the Sigma 2x vs the Canon Mk2 and found the Canon noticeably better in colour and contrast though pretty similar in sharpness. I later traded The Canon Mk2 2x to get the Mk3. Basically My Canon Mk2 2x was staying at home as I felt cropping was better (remember I found the Sigma significantly inferior to the Canon Mk2) in other words it was a waste of money giving mediocre results on my 300 & 600mm lenses. The Mk3 2x however is enough better to make it worthwhile (it is VERY good on F2.8 primes) to use and carry around. Though very expensive the 2 x Mk3 is significantly better than the Mk2 which was significantly better than the Sigma. Though the Sigma wins hands down on price!
If you want to use a 90EX then that would clearly limit you creatively somewhat as it will always be there to act as a fill flash whether you want it to or not, and also it will limit the range. Of course you could always make a snoot that directs the flash from the 90EX away from your subject and onto your 430 but then again a dedicated trigger would be all the easier.
The optical pulse generated by Optical Masters precede the actual flash and are not captured in the shot. For example, you can use the 7D to drive off-camera slaves without the pop-up flash filling in the shot.
I'd go with the 90EX among the two choices since you already have the 430EX II and just need something for fill flash and can occasionally drive the 430. The only thing you'd gain by getting the 270 is a lighter and far less capable alternative to the 430. Not worth it in my opinion.
If I were to choose, I'd just carry the 430 and get some RF triggers.
In my opinion bokeh is produced by exposure (light waves under specific angles) and lens design (set of lens elements that pass through the light). Sensor is responsible for capturing the light and that's all.
But what about the different sensor size + distance from the lens, as I understand it the f-stop comparison needs to be adjusted from APS-C to FF, so perhaps this explains why the Bokeh on a crop may appear better at say f2.8, but using the same lens on a FF a direct like-for-like comparison would require a smaller aperture to get the same field of view...so really need to compare bokeh by adjusting aperture first??