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Message: <blockquote data-quote="DRodrigues" data-source="post: 1583125" data-attributes="member: 55152">bird binoviewingFinally I wrote a small text about my experiences to cr-binoviewing and put it at <a href="http://www.pt-ducks.com/cr-telescopes.htm#Towards_cr-binoviewing_" target="_blank">http://www.pt-ducks.com/cr-telescopes.htm#Towards_cr-binoviewing_</a>If you read the text you will notice that I'm looking for a <=500mm focal length Apo-refractor.There are some high quality and high price models but I can't spend too much money with it. From the possible solutions I selected some that would like your opinions/experience with these:- Meade Series 5000 80/480 - triplet but with FPL51 glass - about 600 €;- TS ED APO 90/500mm - doublet with FPL51 glass but have higher aperture and 2.5" focuser - about 800€;- APM APO 80/480 WI - a true Apo triplet but costs about 1500€...;- Skywatcher Equinox 80 - Apo 80/500mm - doublet but with FPL53 glass - about 600€;- William Optics APO - 88mm Megrez 498mm - larger aperture but probably FPL51 glass - about 700€.The main question is if the higher image quality of the APM will be noticeable with so much glass after it or is better to go to higher aperture. I liked the image quality of the Skywatcher 80/600mm and people doing bird dslr photography like also it. Also FPL51 vs. 53...Thanks for any comment.David</blockquote>