What is APO and What are the real APO lenses on the market?

Started Jan 9, 2013 | Questions thread
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joneil Regular Member • Posts: 172
Re: +1 to what Michael said..

When shooting astrophotos, over the years many of us have found that very few SLR lenses (film or digital) are truely "aprochormatic", in that, they showed a blue or purple fringe on the stars unless stopped down.   A lot of supposedly "apo" telescopes were not either, but that's another story.

One of the very few lenses that did appear to be a true or nearly true apo lens was the manual focos, 180mm ED nikkor.  google that lens and astro-photography, and you'll come up with many examples.

Another issue is that many companies have different interpretaitons of what apochromatic is.

Finally i fyou want an example of a really apochromatic lens, take a look at the 105mm UV nikkor.  I found a link here:


Now that's an apo lens. 

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