msowsun wrote in post #17962869
Why would you want to use a Full Frame lens on a crop camera?
Why not buy a Canon 17-55mm 2.8 or Sigma 18-35mm 1.8 instead?
Several years ago when I was shooting Nikon, I was faced wirh a similar decision. Either get a 17-55mm 2.8 DX or the 17-35mm 2.8 non DX lens. I opted for the DX lens. While it was a great lens ( I still own it), I wanted the best possible optics for DX at the time. It was to be my main lens. Every other Nikon lens I owned was for "full frame".
Fast forward to last year and I found myself wanting to upgrade to a newer system from my two D200's and older D1X's. If I had gone with a full frame Nikon (D800), I would only have had all the full frame primes I currently own. However, I would have still needed to get a wide to normal zoom. I didn't like the D600 because it felt cheaply made and had a bad reputation of getting oil on the sensor. In other words I would have had to purchase a full frame body plus a decent (expensive) wide to normal lens.
So, having lost all hope that Nikon would ever release a D400, I decided to buy into Canon with a 7dmk2. Having also owned a T3i with a couple of kit lenses (my travel camera because my Nikon gear was way too heavy), I still have the 10-18 EFS, 18-55 EFS, 55-250 EFS.
For my 7dmk2, I have a 50mm 1.8 STM and a 70-200mm 2.8L (non IS). These two lenses work amazingly well on my 7dmk2.
Yes, I could go out and purchase the EFS 17-55mm 2.8, but based on my past experience I would rather have a full frame lens. At some point I will venture into full frame. Maybe in a few months, maybe in a few years. I would much rather own lenses that are compatible with both formats (regardless of the crop factor), than find myself in the same bad position I was with Nikon.
As far as selling equipment goes, I rarely sell any of my stuff. On a couple of occasions I was able to prevent getting scammed by online bogus buyers. So, I only prefer to sell in person, but unfortunately I live in a city where people don't spend much on photography equipment.
Also, I had a couple of negative experiences with Sigmas in the past.