Need some equip advice (to FF or not to FF?)

[Hadooken]

I'm thinking of making the jump to full frame for this type of photography. Curious as to what you all would think.

The reason I am considering this, is due to the generally overall better focus with FF cameras, and the superb ISO performance.

Currently I have a 40D, with a 70-200 2.8 IS, and 3 other lenses which will only fit on crop cameras. Their value totals about 1300 dollars.

If I sold off my 40D, and all the lenses minus the 70-200, I would have around 1900 dollars. Curious if this is worth it, or if I should just stick with the 40D for a few more years. It was my first DSLR, and has served me well, but at the same time, I want something more.

Was looking at a used 5d + 1 more lens to go with it. Any thoughts?

Thoughts?

[Coppatop85]

This should probably be in the discuss section. I'm in a similar position, but in no dire need to switch to FF. Maaybbee might upgrade to the 50D. My 40D treats me well, I am going to try to get some more glass first. By time time I can even fathom switching to Full Frame, I assume the 60/70D or 5D mkiii will be out.

[bacchanal]

I'm not sure what you mean by better focus, but the 5D isn't really better than the 40D in that regard. The 5D has 9 points (1 cross type) with 6 hidden assist points in the center of the frame, while the 40D had 9 selectable cross type points. Personally, I find the 40D system to be a little better in low light.
For high ISO stuff the 5D will give you about a 2/3 stop advantage once the image is resized to match the 40D and it should give you an overall slightly crisper image out of the camera. It is a slight difference more than an earth shattering one. The 5D files do seem to have a slight advantage when it comes to processing, but it is hard to quantify.
Imho, the main reason I'd switch to a 5D from a 40D would be for FOV reasons. Mainly, there are more options for fast wide angle lenses when you go to FF.

I think it kind of depends on what your other lenses are and what you'd be getting if you went to the 5D. I don't think I'd want to give up good glass options to go FF.

[René Damkot]

For better focus, you (probably) want a 1D series, or a 40/50D. Not a 5D.
All else being equal, the AF points on a FF are to close together IMO.

Also, you'll have less DoF. Not always a good thing IMO.

Noise is overrated. My 1D2 is fine at 1600, pretty usable at ISO 3200.