Comments made by johnwhit - Page 119

Topics Created Topics Contributed Forum Comments Photo Comments

All Forum Comments

Anvh wrote:

davex wrote:

Quote:
As it's SDM you will have a very hard time finding a 2x AF teleconverter that will work properly

I though it also had a screw drive? have no experience with SDM, given it has both presumably it would "fail" to screw drive if a teleconverter was in place?

The lens gives information to the camera, through the contacts so if the camera knows the lens has a SDM than it will use that and there is no way to force it to use the screw-drive.
Because if you cover that contact the camera will think it's not an auto-focus lens at all so it will not use any means of AF

The only way is that the TC gives the information that it's AF but only the Pentax TC 1.7x AF does that as far as I know.

The Teleplus converters and all the rebadged clones with Pz-AF in the description all have the Powerzoom pin contact that supplies power to the SDM. Teleplus/Kenko 1.5x SHQ, 1.7x SHQ 2x MC7 and early Tamron 1.4x.
Used them all with SDM.

John

Comment by johnwhit posted on DA* 200mm ED (IF), any good? at 02/09/2010 - 17:27

Nice one, reasonable price.

John

Comment by johnwhit posted on DA* 200mm ED (IF), any good? at 02/09/2010 - 15:33

Hi Dave I think some of the later ones didn't have the PZ (Powerzoom contact) but if it says Pz-AF it should work fine, I had one for some time, wish I'd kept it now, really quite good 2x TC

John

Comment by johnwhit posted on DA* 200mm ED (IF), any good? at 02/09/2010 - 13:44

Teleplus Pz-AF 2x MC7 element works well and you get full SDM support.

John

Comment by johnwhit posted on DA* 200mm ED (IF), any good? at 02/09/2010 - 13:32

IIRC there's one on Ebay this morning.

Item number: 320584660246

£225 Buy it Now

John

Comment by johnwhit posted on Wanted: Pentax/Tamron 18-250mm lens at 02/09/2010 - 13:14

Probably the most critical of reviews:

http://www.photozone.de/pentax/370-pentax-smc-da-200mm-f28-ed-if-sdm

The DA*300 is awesome BTW, never had any problems at f/4

John

Comment by johnwhit posted on DA* 200mm ED (IF), any good? at 02/09/2010 - 07:14

It's not too shabby

[IMG]http://i884.photobucket.com/albums/ac49/johnwhit24/DA200/TheFalconerl.jpg[/IMG]

[IMG]http://i884.photobucket.com/albums/ac49/johnwhit24/DA200/Owl.jpg[/IMG]

Both shot at f/4 BTW

It's sharp wide open, but watch out for purple fringing in extreme conditions.

John

Comment by johnwhit posted on DA* 200mm ED (IF), any good? at 01/09/2010 - 19:57

I used a Rocket Blower on the K20D screen, came up spotless.

http://www.the-digital-picture.com/Reviews/Giottos-Rocket-Air-Blower-Review.aspx

Dust on the focusing screen shouldn't appear on your images, that would be dust on the sensor. Never touch the focusing screen wth your fingers or anything else, they're easily marked

John

Comment by johnwhit posted on Cleaning K10d Focusing Screen Dirty at 01/09/2010 - 13:42

A beautiful set David

Regards,

John

Comment by johnwhit posted on Stained glass at 31/08/2010 - 20:44

johnriley wrote:
A link would be useful.

http://cgi.ebay.co.uk/Sigma-17-70mm-f2-8-4-5-DC-Macro-Zoom-Lens-Pentax-/12061506...

http://cgi.ebay.co.uk/Pentax-SMC-DA-70mm-f-2-4-Limited-Pancake-lens-/12061506148...

John

Comment by johnwhit posted on 70 limited and Sigma Zoom at 30/08/2010 - 09:59

Proudly supporting Pentax User

johnwhit

All Forum Comments

All Forum Comments

ADVERTISEMENT

ADVERTISEMENT

ADVERTISEMENT

Proudly supporting Pentax User