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05-01-2011, 11:36 PM   #1
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Loren E's Avatar

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Location: Washington and California
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Question about zoom lens design specific to DA* 50-135

So the DA* 16-50 and 60-250 both have telescoping zooms, making them considerably more compact when at their shortest FL than when at their longest. Of course the 50-135 has a fixed size that does not change when zooming. My question: had this lens been designed with a telescoping zoom would it too be far smaller for travel when at it's most compact, or in other words, does this lens have the potential to be much smaller? I realize that many people like it's non telescoping design for durability/sturdiness, but I am curious what makes Pentax not standardize this across their DA* zooms....any insight?

Thanks -LE

05-03-2011, 06:31 AM   #2
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Location: Maryland / Washington DC
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I don't know nearly enough about lens design to answer this question properly. However, I don't think the 50-135/2.8 would have been much smaller even if it had not been an internal zoom lens. I wish the DA*60-250 had an internal zoom as well, but I have a feeling that would have made for a considerably longer lens. As it stands, the 60-250 isn't that much taller than the 50-135 when at it's smallest for storage.

Hopefully someone with more insight into lens design can chime in with a more specific answer

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