Front Mount Lens Definition
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Related Faq
Q
Does it have thread at front side for another filter to fit. If yes is the back side and from side thread are of same size or different. Thank you
A
It has,for this series, front thread diameter is bigger than the back thread diameter. For example: Back thread diameter (attach to lens): 55mm Front thread diameter (attach additional filter/other accessories): 58mm 
Q
How to choose a size filter suitable for my lens?
A
In order to buy a lens filter, you need to know the diameter of the lens. The size is usually displayed next to the ø symbol on the front of the lens. 
Q
Will this work on my sony a6000 and tokina minolta 100-300mm macro zoom?
A
Yes 
Q
Other accessories like lens hood attached to the fisheye lens, the size should be bigger
A
For example: KF21.005(58mm 0.35X)
Back thread diameter (attach to lens):58mm
Front thread diameter (attach additional filter/lens hood/ other accessories):67mm
 
Q
Too loose/there is gap between lens and adapter ring
A
  1. If there is ever any more than a slight amount of rotational play, you may want to try tightening the lens mount adapter so it will hold the lens tighter to the mount. There are 3 flanges in the middle of the adapter (what the lens locks onto) that are split open slightly, this gap is what gives the tension that holds the lens tight to the body. Over time and with use these gaps decrease in size, no longer pulling the lens tight to the adapter, which allows the lens to move inside the mount more than it should.
  2. To tighten the fit, get a slim metal object (a #1.5 or #2.0 small flat eyeglass screwdriver is ideal) and insert it into the slit to open it up just a little bit (see images below, make sure to do it to all 3 evenly). The more you open the gap, the tighter the lens will be to the adapter; too much and the lens will have a hard time mounting so make sure to do it just a little bit at a time to all 3 flanges evenly, it doesn’t take much at all to get a tight fit.Note: please do not use too much strength, or the shrapnel will be damaged.
 
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