Hi Gen Lee,
For hotel rooms I use a Canon 10 -22mm zoom. [[Crop factor 1.6] 16 to 35mm]]
While viewing the room through the view finder, align the left or right image edge up with a vertical door way or wall corner. Usually I zoom in a bit to reduce the barrel distortion while still trying to capture the full width of the room. Usually the image is taken around @19 or 20mm.
The remaining barrel distortion if any, is removed in Photoshop.
Filter | distort | lens correction.
In selecting a new lens, you might also want to consider looking for that particular lens Modular Transfer Function (MTF) for laboratory quality testing.
While we have discussed this MTF topic before, it might be worth a quick review. At least you will know the MTF characteristics before you buy it and know what to expect:
If you are going to spend $400 to $1,000 on a lens you might consider looking at the lens specifications. When choosing expensive len$es you might do a quick google search for Modulation Transfer Function Charts (lens MTF ratings). Canon has their MTF Lens charts on their website. Nikon did not last time I looked. I won't get too technical here because the first time around I found the subject a bit overwhelming. The short answer here the chart shows the lens test for its ability to transmit light through the lens optics. The lab measurements are for 'Contrast' and 'Sharpness'. The higher the rating the higher quality of image. Lenses that rate from .8 to 1 are "Excellent" and .6 to .8 are "Average".... regardless the manufacturer selling price.
For example the Canon 28 - 135 f/2.5-5.6 IS USM (Canon 20d [1.6] 35mm equal to 45mm to 216mm] zoom. If you scroll down to the bottom you will see 2 charts. The left side chart is for maximum view 28mm and the right side chart is for full zoom in at 135mm.
Vertical scale is 0 to 1 or ability to transmit all the incoming light all the way back to the film plane. The horizontal scale is 0 to +20 where 0 is the center of the lens and +20 is the edge of the lens glass.
Look for the solid blue and black line. The solid blue line is 'Contrast' or the lens ability to maintain high contrast. The solid black line is 'Sharpness'. Ignore the dotted lines. Sharpness is determined by the ability of see 10 or 30 lines per millimeter thickness on the film plane (sensor).
I realize that this is a simplified explanation. Before spending the big bucks for glass suggest reading a more in-depth expanation about MTF:
Below is our medium priced lens collection:
Sigma 8mm EX 180 Fisheye f/4mm prime lens
Canon Wide Angle Zoom EFS 10-22mm f/3.5 to 4.5 USM
Canon Stock Lens EFS 18-55mm f/3.5 -5.6 II
Canon Zoom EF 28 - 135mm f/3.5 to 5.6 IS (image stabilizer) USM
Canon Zoom EF 70 - 300mm f/4 - 5.6 IS (image stabilizer) USM
At the end of the day... great imaging really depends on the person abilities behind the viewfinder.
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