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Switch both body and lens to M

dankeny

Roland, US
1555 posts

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dankeny Gold Member Nikonian since 29th May 2006
Tue 16-Nov-10 07:38 AM

A Q in lens forum made me wonder. Why do you need switch both on 7k with AF lenses? Manual page 99. Force of habit is more powerful than a locomotive.

David

briantilley

Paignton, UK
30235 posts

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#1. "RE: Switch both body and lens to M" | In response to Reply # 0

briantilley Gold Member Deep knowledge of bodies and lens; high level photography skills Donor Ribbon awarded for his support to the Fundraising Campaign 2014 Nikonian since 26th Jan 2003
Tue 16-Nov-10 07:38 AM

Not all "screwdriver" AF lenses have an AF/MF switch, and those that do, don't all behave the same.

To answer the question, on some AF lenses (the 180mm f/2.8D is one), the focus collar cannot be turned unless the lens is switched to MF, but with the lens in MF, turning the focus collar rotates the screwdriver clutch. That means the camera has to be switched to MF as well, otherwise the camera AF motor will be driven in reverse, with risk of damage.

Brian
Welsh Nikonian

blw

Richmond, US
28708 posts

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#2. "RE: Switch both body and lens to M" | In response to Reply # 1

blw Moderator Awarded for his high level of expertise in various areas Nikonian since 18th Jun 2004
Tue 16-Nov-10 08:42 AM

This is a very annoying characteristic of this particular lens. Are there others? I haven't encountered any others.

_____
Brian... a bicoastal Nikonian and Team Member

My gallery is online. Comments and critique welcomed any time!

dankeny

Roland, US
1555 posts

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#3. "RE: Switch both body and lens to M" | In response to Reply # 0

dankeny Gold Member Nikonian since 29th May 2006
Tue 16-Nov-10 10:32 AM

Oops! So it's lens dependent and I've been operating my 200 and 700 screw drives in reverse as well. Thankfully, risk of damage hasn't yet occurred and now I know better. Thanks B1 for splaining. And I'm with you, B2, annoying. Still, I'm willing to live with it on the 180 because it's so darn good.

David

benveniste

Boston Area, US
10294 posts

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#4. "RE: Switch both body and lens to M" | In response to Reply # 2

benveniste Moderator Awarded for is high level skills in various areas, including Macro and Landscape Photography Donor Ribbon. Awarded for his generous suppport to the Fundraising Campaign 2014 Donor Ribbon awarded for his very generous support to the Fundraising Campaign 2015 Nikonian since 25th Nov 2002
Tue 16-Nov-10 02:19 PM

There are a lot of annoying/awkward solutions implemented in screwdriver lenses.

I own Sigma, Tokina and Pentax lenses which use a clutch mechanism. If you pull back on the focus ring it engages autofocus, push forward for MF. Or perhaps it's the other way around on some or all of them -- I can never remember. Even worse, sometimes you have to turn the focus ring in order to get the clutch to engage and sometimes you don't.

The earliest 180mm f/2.8 AF lenses didn't have an A/M switch at all.

You don't have to sort of enhance reality. It is already pretty weird ... you know that there is nothing stranger than truth. Annie Leibovitz

Covey22

US
11756 posts

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#5. "RE: Switch both body and lens to M" | In response to Reply # 4

Covey22 Moderator Expert in various fields including aviation photography Awarded for his contributions to the Resources and The Nikonian eZine Charter Member
Tue 16-Nov-10 04:23 PM

I moved to a Tokina 28-70 briefly before my first AFS lens which was the affordable 24-85 G. I thought the manual clutch was the coolest ergonomic design ever. On reflection, it's very instinctive as opposed to reaching to the side for a toggle switch.

G