C Mount Lens Crop Factor
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Five Stars
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Great projector
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 Super build quality. Both the case as well as the actual projector itself feel very solid in hand. Excellent image quality. This is not a true 4K projector, with a max output supporting 1080 but supporting 4K input. At this price point you aren't going to get a 4k native projector. That said, image quality is still great. This gets plenty bright over a large range. Colors look sharp, even in rooms that may not be fully blocked off from light. The auto focus functionality is new to me, and works really well on this. It quickly detects when the unit has been shifted and will throw up a central focus point and will adjust until it's perfectly in focus. Complete takes the guess work out of getting the focus working properly
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Related Faq
Q
Does the M42 to Nikon F with optical glass change the focal length (crop factor)?
A
Hello, lenses do not affect focal length, only when the frame of the lens and camera is different will it affect focal length. 
Q
Is this compatible to mount a 95mm filter to a 55mm lens?
A
Hi,this is not compatible. 
Q
Hello, I have an asp-c camera, do I have to add the crop factor for my camera, i.e. 35mmx1.6?
A
Yes, you have to. 
Q
How can I know my lens mount/camera mount?
A
  1. You could consult us or search the mount information online
  2. You could find the mount information on your instruction book when purchase the lens/camera
  3. The mount information may be showed on front of the lens, side of the lens, rear of the lens or on the lens cap, usually it is a 2 or 3 letter code such as: CN, FD, OM, MAF, NK, N/AIS or F/AX
 
Q
Will this work for a 4/3 format camera. the crop factor is 0.5 so it is a little smaller than the aps-c sensor.
A
Yes I'd think so. You have to imagine these swabs as flat Q-tips with the flat edge about 1/2 the height of a aps-c sensor. 
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