How to Find Infinity Focus on Your Lens | The Photographers Blog

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INFINITY FOCUS
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INFINITY FOCUS

• When you focus your lens on infinity, it means
  you have focused on things that are very far away
  from you. It also means that everything in your
  frame is in focus up to infinity.
• Infinity focus is mostly used for star trail
  photography or Astrophotography or most commonly
  while photographing the Milky Way With infinity
  focus, you make sure that the faraway subjects
  are in focus and will thereby appear sharp in
  your pictures.

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Two effective ways to set your lens to infinity
focus

• When your lens has the infinity marking on it
• When you do not have an infinity mark or your
  lens 

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When your lens has the infinity marking on it
An infinity stop is marked with an inverted 8 on
the focus scale as shown in the below picture
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When your lens has the infinity marking on it

• You simply have to choose to set your lens to
  infinity by moving the focus point to this mark.
  Dont forget to take test shots before you go for
  the final one.
• The exact position of infinity focus differs from
  lens to lens, so it always better to know your
  lens and its exact infinity mark position where
  it works the best.

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When you do not have an infinity mark or your
lens 
I have used this method for star trails, the
Milky Way and it works perfectly.
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When you do not have an infinity mark or your
lens 

• This is a simple manual method.  Set your lens to
  autofocus and focus on a distant bright object.
  Maybe on the brightest star or a far away light
  source. The moon serves the best to set
  autofocus.
• Once you have achieved that focus, gently turn
  your lens to manual focus without touching the
  focus ring.
• You now know that you have a distant object in
  focus because you have already achieved that with
  autofocus. Turning to manual mode after achieving
  correct focus with autofocus means the focus will
  remain intact until you disturb the manual focus
  ring on your own.

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