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MM4 77mm

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Old Thursday 15th August 2019, 14:01   #26
dipped
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Join Date: May 2004
Location: suffolk
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Originally Posted by Jonathan Avery View Post
Does the MM4 77 ED with its shorter focal length have as crisp an image as the ES 80 ED or does the weight saving come at the cost of some optical quality?
I think it's more likely to come down to which is the best specimen with the least aberrations.
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Old Friday 23rd August 2019, 15:56   #27
Jonathan Avery
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Location: Oxted, Surrey, UK
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Originally Posted by Jonathan Avery View Post
I have an MM4 60 ED and must compare the MM4 77 ED with it when I get a chance (maybe next week).
I had the opportunity to compare the MM4 60 ED side by side with the MM4 77 ED earlier this week on a birding trip to Norfolk. The MM4 77 has a bigger brighter image and obviously a further reach than the MM4 60. However, to my eyes, the colour in the MM4 60 looked more intense and vivid (is the technical term saturated?). I have to say that this was just an impression on a quick look through both scopes and was in no way a rigorous technical comparison. It was based on one sample of each model although the colour intensity of the MM4 60 demo model did remind me of my own MM4 60.

I am not an expert optics analyst so I would be interested to know what other people think.
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