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

Started Jan 9, 2013 | Questions thread
joneil
Regular MemberPosts: 129
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Re: +1 to what Michael said..
In reply to inasir1971, Jan 13, 2013

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:

http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/special/105UVmm.htm

Now that's an apo lens. 

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