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Message: <blockquote data-quote="Musoman" data-source="post: 1674318" data-attributes="member: 80278">I've only read good things about the Kenko Pro 300's, so it maybe an option, and like you said, much quicker to swap about.On a different note,  as you've mentioned, an ext. tube would be needed for closer work, but i forgot ask is...  although you'd get closer focus for birds that are closer, do you have to then remove the tube again to get the long focus back ?Photos would be fab !Also I have to look in to the AF confirm chip too. Its a must for me. I have a few EOS / M42 pre-mounted chip adapters, but i guess these are no good, because although they fit the Canon 450d body ok, you have to specify the mount on the other side - and thats where that little plan goes wrong, so i guess its the seperate chip + glueJust out of interest - is this Ext tube as good as DSLR ext. tubes, apart from being just one fixed length ?<a href="http://cgi.ebay.co.uk/TELESCOPE-80MM-EXTENSION-TUBE-2_W0QQitemZ350293957492QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518f259b74" target="_blank">http://cgi.ebay.co.uk/TELESCOPE-80MM-EXTENSION-TUBE-2_W0QQitemZ350293957492QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518f259b74</a></blockquote>