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General / Sharpness and focal length
« on: February 14, 2013, 04:32:37 AM »
I've been trying to research this as much as I can before posting this but I haven't found as much information as I would have liked specifically regarding photoscan.
Currently I have invested in a Canon 60D and a 24-105mm lense for recreational purposed. I'm now using this camera for Photoscan and would like to invest in a prime lens. From what I understand a 50mm lense on a full frame sensor is the best way to go to get great results.
I'd like to know what the best set up for a crop sensor is. I know that the sigma f1.4 30mm equats to ~48mm and the Canon f2.0 35mm works out to be ~55mm. Mean while your 50mm lenses come to about 70mm. Which is more appropriate? Does it matter? Personally I would like to go the Sigma 30mm or Canon 35mm as I have limited room, but if it's going to hurt my results I'd rather spend the money on a 50mm.
Also a question on sharpness. Would the difference in sharpness between a Canon f1.8 50mm @ f8 and a Canon f1.4 50mm @ f8 make a noticable difference to my results?
http://www.astrosurf.com/buil/50mm/test_us.htm
I'm hoping to get a bit of clarification on this before I start spending money on the lenses and testing with my 24-105 is difficult because it doesn't have a zoom lock and the focal length slips over time (v frustrating)
Also any recommendation for lenses would be much appreciated.
Cheers,
Greg
Currently I have invested in a Canon 60D and a 24-105mm lense for recreational purposed. I'm now using this camera for Photoscan and would like to invest in a prime lens. From what I understand a 50mm lense on a full frame sensor is the best way to go to get great results.
I'd like to know what the best set up for a crop sensor is. I know that the sigma f1.4 30mm equats to ~48mm and the Canon f2.0 35mm works out to be ~55mm. Mean while your 50mm lenses come to about 70mm. Which is more appropriate? Does it matter? Personally I would like to go the Sigma 30mm or Canon 35mm as I have limited room, but if it's going to hurt my results I'd rather spend the money on a 50mm.
Also a question on sharpness. Would the difference in sharpness between a Canon f1.8 50mm @ f8 and a Canon f1.4 50mm @ f8 make a noticable difference to my results?
http://www.astrosurf.com/buil/50mm/test_us.htm
I'm hoping to get a bit of clarification on this before I start spending money on the lenses and testing with my 24-105 is difficult because it doesn't have a zoom lock and the focal length slips over time (v frustrating)
Also any recommendation for lenses would be much appreciated.
Cheers,
Greg
