Author Topic: apo  (Read 1817 times)

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Offline ronnieb

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apo
« on: February 25, 2012, 10:14:28 PM »
can any one tell me what the difference is with apo lens   as to ordnary lenses   thanks
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Offline Andrewbarrettuk

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Re: apo
« Reply #1 on: February 25, 2012, 10:21:38 PM »
shamelessly copied from www.sigmaphoto.com "Apochromatic lenses are telephoto and telezoom type lenses which use special optical designs and optical materials (SLD or ELD glass) to improve their performance"

Offline Bigbreakfast

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Re: apo
« Reply #2 on: February 25, 2012, 10:34:29 PM »
about £100?
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Offline ronnieb

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Re: apo
« Reply #3 on: February 25, 2012, 11:18:30 PM »
still need to no what the diference is apart from optics
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Offline harveyzone

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Re: apo
« Reply #4 on: February 25, 2012, 11:34:45 PM »
still need to no what the diference is apart from optics

Optics is the difference! Or are you referring to differences in a specific APO lens and its non APO equivalent rather than APO lenses in general?

As I understand it APO (apochromatic) lenses are designed to focus all parts of the chromatic spectrum (all colours of light) onto the same plane so as to eliminate (or, at least, reduce) chromatic aberrations (coloured fringing).

Any other differences in APO lenses compared to their non APO equivalents is not relevant to their APO design.

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Offline Faldrax

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Re: apo
« Reply #5 on: February 26, 2012, 09:40:37 AM »
In addition to what harveyzone has said, it is also something that tends to be part of more expensive lenses - in the same way that (using Sigma again as an example) HSM tends to be part of a more advanced design, in addition to beinging hte advantages of HSM.
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Offline Gordon McGeachie

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Re: apo
« Reply #6 on: February 26, 2012, 03:55:54 PM »
I had a Sigma 75-300 APO zoom in my film days and the results were amazing...........

I just wish that I had kept it when I gave it and a Minolta 35-80, and my 7xi film body to a friend who is longer a friend............,

I used it on my 7d and got great results too..........
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Offline ronnieb

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Re: apo
« Reply #7 on: February 26, 2012, 07:22:27 PM »
thanks guys i have just bought a 75  300 sigma apo  .so i should expect some inprovement in shots with this as opposed to useing my tamron 75   300   
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Offline Gordon McGeachie

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Re: apo
« Reply #8 on: February 26, 2012, 09:39:35 PM »
I found that the colours were much sharper with the one I had.

I am sure you will too....
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Offline Effstop

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Re: apo
« Reply #9 on: February 26, 2012, 10:57:39 PM »
thanks guys i have just bought a 75  300 sigma apo  .so i should expect some inprovement in shots with this as opposed to useing my tamron 75   300   

I'm sure you will be very happy with the results from your Sigma, in a side-by-side comparison that I did with it and the Sony 75-300, the Sigma ran rings around the Sony in sharpness, colour and lack of CA (purple fringing).  I did eventually replace the Sigma with the Sony 70-300G, but not because I wasn't happy with it, I just lusted after the "G"!  Performance for price, the Sigma APO is an outstanding lens IMO

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Re: apo
« Reply #9 on: February 26, 2012, 10:57:39 PM »