been a lurker for some time, great forum, would love to get your advice.
I've been shooting with a 400d (Rebel XTi?) since 2007 and have been happy enough with the size, handling and IQ outdoors. I have an EF 28-135 IS and an EF 50 1.4 and a Speed Lite 580.
I feel like it's time for an update. The things I'm missing most are low-light capabilities (I try not to go over ISO 400 and only use ISO 800 when REALLY needed), so I'm often stuck with my 50 mm lens indoors. I love that little lens, but on a crop body I would just need something wider. Would also love a better auto-focus since currently 90 % of the pics I take are of my toddler, second one on the way.
Now there are two possibilities I thought of:
Get a 6d, that way my lenses would be more wide-angle, I'd have amazing low light possibilities and an improved auto focus. Might want to add a 100 mm Macro (non-L) since I'd like a Macro lens anyways and I could use it for portraits as well. Cons: Size (quite happy only shlepping a Rebel around), price. Not sure how much better the auto focus would do. Otoh would focus in low light.
The alternative would be 650d/700d or 100d. Pro: Somewhat improved light sensitivity, the question is just how much compared to what I currently have. Also smaller size compared to a 6d. Would have money left over to buy new lenses. As an extreme example 600€ for a 650d plus 2100€ for a 24-70 2.8 Lii is the same as a 1800€ 6d plus a 900€ 24-105 4L
The other question would be whether it would make sense to still use my 28-135? I'm happy with the image quality but would it be the same on a FF sensor? (On the one hand bigger pixels, but on the other hand more vignetting?) The other question would be how much IQ I would give up on on a 6D. If not: What replacement to get? What "resolution" would that lense have? When I replace in a couple of years, would I have to buy new again?
Money is a factor, I would not be making any money with that equipment and in all likelihood won't in the future. The question is therefore more how much more light sensitivity, IQ and auto focus improvement I would get in a 6D, and whether it's worth the extra cash.
Thanks a lot