SMC DA 18-55mm Zoom


Aitch53

Link Posted 04/06/2016 - 13:19
Possibly a silly question, and certainly trivial, but I've noticed that all my digital zoom lenses (Panasonic, Pentax, Sigma) are shortest (physically) at the wide end of their range and extend as you zoom. Apart from the 18-55mm, which is shortest at 35mm and extends as you get shorter or longer.

Anyone know the reason for this? I assume Pentax chose this configuration for a reason.
SteveH!

Some people call me 'strange'.
I prefer 'unconventional'.
But I'm willing to compromise and accept 'eccentric'.

smudge

Link Posted 04/06/2016 - 13:35
There are some other exceptions. My Sigma 24-70 is shortest at the long end - well, at about 65mm to be more precise.
Regards, Philip

pentaxian450

Link Posted 05/06/2016 - 03:50
The Pentax DA 12-24 is shorter at 18 than 12 or 24mm.

It all depends upon the type of lenses used and their location within the objective.
Yves (another one of those crazy Canucks)

Aitch53

Link Posted 05/06/2016 - 08:56
pentaxian450 wrote:
The Pentax DA 12-24 is shorter at 18 than 12 or 24mm.

It all depends upon the type of lenses used and their location within the objective.

Well, yes, I'd guessed that. What I was wondering was why they had gone for that particular configuration. To avoid an inconvenient physical length if they went for the 'usual' one? Better quality?
SteveH!

Some people call me 'strange'.
I prefer 'unconventional'.
But I'm willing to compromise and accept 'eccentric'.
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