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| p.1 #2 · p.1 #2 · Canon Rebel SL1 vs Rebel XTi for Infrared photography |
I don't think you should look too much at the higher resolution etc. of the new camera compared to your old one. I'm using a Lifepixel converted 450D (Xsi, 12 MP) and for me the main limitations are:
- lenses: many Canon lenses are not very good in IR, giving obvious hotspots or bad corner quality. I'm mostly interested in WA range for IR photography and currently using the 15-85IS lens. It does pretty well in IR but below about 24 mm (36mm equiv.) the corners are a severe compromise probably due to astigmatism. I'm hoping to test the new 10-18mm for IR soon and hope it is better in the top of the range. I'm not aware of other lenses in this range (affordable and not too big/heavy) that are suitable.
For reference: for a long time I used a full spectrum Sony dsc-f717, a compact from over ten years ago with 5 MP resolution. My current 450D is clearly better in the image center due to better sensor, RAW etc. but the f717 easily wins when looking for sharp corners for WA shots (even using a WA converter ...).
If you shoot mostly standard or tele primes lens quality will be less of a problem, e.g. the 1.8/50 and several tele primes that I tried work great. In that case you can really see the benefits of the newer SL1 sensor.
For 6D there are more (WA) lenses available that perform well in IR, but that only helps if you already have the right lenses.
- liveview display: I want this to judge infrared look, which IMHO is not always predictable (opinions seem to vary ...) and optimal focus. On a compact/ ILC this works great, but on a 450D it is extremely tedious. You have to switch to liveview to judge the IR scene and focus, and the LV display is 'tearing', unpleasant to use and difficult to view in broad daylight that is common for IR photography.
With the 15-85IS lens the PDAF of my 450D seems to work pretty well and if you aren't too critical focusing with LV (CD-AF) isn't necessary. But with some other lenses it definitely is required.
For LV it would help to have a tilting display, which neither SL1 or 6D has; a real EVF would be even better (if the EOS-M had one, plus faster AF, I would probably use that camera instead ...). It is sooo much easier to put the camera to your eye and immediately see the scene in IR, instead of having to switch to a special mode and getting a rather crude, washed-out view ...