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<blockquote data-quote="Blue439" data-source="post: 828580" data-attributes="member: 53455">Well, long lenses are big and heavy and slow, unless they're even heavier and bigger and cost one and a half lungs... Getting on in age has its problems as well. Ten years ago, I lugged around a30-liter Kiboko full of primes with a humongous 200-400mm ƒ/4 on top and no complaints. Nowadays, I am more mindful about weight but still, giving oneself some exercise is also good and worth the effort if it is not overly uncomfortable. Personally, having seen what Z glass does for us, I will never return to F glass unless I have no choice. For long reach, I use the Z 100-400mm which is not a very fast lens but has outstanding image quality and (I think) reasonable weight plus a very compact form factor.If you want to go extended range zoom and not too heavy, you will mechanically end up with inferior build quality and inferior optical quality. Compromises must be made.It's like what I call “The Infernal Triangle of Logistics”: there is FAST, INEXPENSIVE and GOOD QUALITY. You can pick any two but you cannot have all three. If it is FAST and GOOD quality, it will not be INEXPENSIVE. And so on...</blockquote>

[QUOTE="Blue439, post: 828580, member: 53455"] Well, long lenses [I]are[/I] big and heavy and slow, unless they're even heavier and bigger and cost one and a half lungs... Getting on in age has its problems as well. Ten years ago, I lugged around a30-liter Kiboko full of primes with a humongous 200-400mm ƒ/4 on top and no complaints. Nowadays, I am more mindful about weight but still, giving oneself some exercise is also good and worth the effort if it is not overly uncomfortable. Personally, having seen what Z glass does for us, I will never return to F glass unless I have no choice. For long reach, I use the Z 100-400mm which is not a very fast lens but has outstanding image quality and (I think) reasonable weight plus a very compact form factor. If you want to go extended range zoom and not too heavy, you will mechanically end up with inferior build quality and inferior optical quality. Compromises must be made. It's like what I call “The Infernal Triangle of Logistics”: there is FAST, INEXPENSIVE and GOOD QUALITY. You can pick any two but you cannot have all three. If it is FAST and GOOD quality, it will not be INEXPENSIVE. And so on... [/QUOTE]

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