12-32mm with 0.79x Wide Angle Converter

tjdean01

Mu-43 Top Veteran
Joined
Feb 20, 2013
Messages
862
The Panasonic Wide-Angle Converter (DMW-GWC1) gives me 11mm on my 14 for real estate work when I don't have the patience to defish. I thought that since I have the fisheye anyway that buying the 12-32 would let me sell both the 14 + the converter. But, the 11mm is noticeably wider than 12mm for real estate work. I keep meaning to compare the 12-32's sharpness @14mm to the 14/2.5; or @12mm vs the 14 + the GWC1. And I want compare its 14-32 range vs the O14-42. Those are all to come, I guess.

Vignetting is so bad with a normal 37-46 step-up ring that it's useless. But, if you can fashion some sort of connector (electrician's tape!) then at 16:9 the 12-32mm + GWC1 gives a very respectable appx 9.5mm FL.


12-32 @ 14mm
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12-32 @ 12mm
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12-32 @ 12mm with 0.79x GWC1 wide angle converter
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Rokfish 7.5mm f3.5 shot from a totally useless position before living room was changed around
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Advice to self: sell 14 + GWC1 and learn to defish! :wink:
 

stargate

Mu-43 Regular
Joined
Aug 14, 2013
Messages
131
Location
Greece
These pics give nice information. Thanks.
I find that in order to use a wide converter in front of a wide angle lens , the converter filter size must be much bigger than the lens filter size and then because of the significant weight of the wide converter, it should not be screwed on the lens but just held there by hand. It is not convenient for long exposures but for regular exposures it is doable. I use a 0.45x converter on my P14-42, the converter has mount diameter of 62mm and it is heavier than the GX1 with the lens combined. However the large diameter ensures that no vigneting occurs and since, essentially, only the center of the converter is used, the corner distortions are minimal.
Also it must be kept in mind that the wide converter factor stated is not a focal length multiplier (a somewhat deceptive act of the manufacturers). Rather it is an area multiplier. So a 0.5x converter means that you get twice the area and so in focal length terms you get the 1/(square root of 2) multiplier for the lens focal length or 0.7x. So in my case my 14mm lens with the 0.45x wide converter becomes equivalent to 9.5mm
 
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