Visit MPB Visit MPB Visit MPB

Lens Operating Ring Layout

bforbes
Posted 13/06/2017 - 11:21 Link
While involved in a discussion to use a battery grip or not, I noticed the layout of the focus and zoom rings was reversed on the DFA 150-450 compared to other Pentax Zoom lenses. At first I thought it's to make it more comfortable to use the longer heavier lens, but then the the DA 18-135, hardly heavy or long, uses the same configuration.

So I've got 8 zooms from F35-70 to DA55-300 including a DA*50-135 that have the zoom ring closest to the body and focus ring in front of that. Then the two lens mentioned above the opposite way round.

The question is, why?
gtis
Posted 13/06/2017 - 17:51 Link
Hi Barrie
Could be than the 50-135 is internal focus i.e. It doesn't get longer when focusing
cheers Neil
pentax k3
DA* 300 f4 DA* 50-135 f 2.8 smc DA* 16-50 f2.8 50mm f1.7 pentax1.4xhd converter





Panasonic Dmc Fz200
Algernon
Posted 13/06/2017 - 18:35 Link
Damn! and I thought they'd got it right

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
bforbes
Posted 13/06/2017 - 18:46 Link
gtis wrote:
Hi Barrie
Could be than the 50-135 is internal focus i.e. It doesn't get longer when focusing

Don't know Neil.
Looking at the photos for the DFA range and the new DA55-300 they are all focus ring closest and zoom on the end. Do we need a lens designer to explain why?
johnriley
Posted 13/06/2017 - 22:06 Link
The newer lenses might use rear group focusing, or it could just be a new way of designing the internals of the lens. It does take a little getting used to, but in the end the important thing is that the zoom and focusing rings operate in the same direction for all lenses. That avoids confusion when using several lenses.
Best regards, John

Add Comment

To leave a comment - Log in to Pentax User or create a new account.