All Forum Comments
Comment by johnwhit posted on FS: Sigma AF 24-70mm f/2.8 EX DG macro at 08/04/2011 - 17:28
K10D wrote:
IQ was well acceptable but the 50-135 had to be in manual, then pre focused to somewhere near with the AF1.7 then locking on. My main surprise was the vast increase in speed of the focus on the K7.
Best regards
Thanks for that, I knew there was a reason I chose not to bother with one despite the almost legendary optical performance.IQ was well acceptable but the 50-135 had to be in manual, then pre focused to somewhere near with the AF1.7 then locking on. My main surprise was the vast increase in speed of the focus on the K7.
Best regards
John
thoughton wrote:
For whatever reason, the Pentax 1.7x AFA is the one and only TC that will convert the focal length for the camera.
Yes, the Tamron/Kenko and all other Teleplus clones that support SDM (1.4x, 1.5x and 1.7x) allow the lens data straight through to the camera and you end up with 300mm and a greyed-out SD menu. But you don't get SDM with the Pentax or do you?For whatever reason, the Pentax 1.7x AFA is the one and only TC that will convert the focal length for the camera.
I've learned to live with it, after all most of the time I want a fast shutter speed for wildlife or sports photography and that suffices. Apparently a lot of top sports photogs switch IS off for the same reason.
John
Frogfish wrote:
John, maybe that's something to do with the K20D ? I don't have that problem with the K5 or K7 (see attached) -although the camera no longer recognises the lense as a DA*300 it retains the FL I've input and adjusts SR accordingly.
[IMG]http://i53.tinypic.com/2m6289e.jpg[/IMG]
Which TC are you using?John, maybe that's something to do with the K20D ? I don't have that problem with the K5 or K7 (see attached) -although the camera no longer recognises the lense as a DA*300 it retains the FL I've input and adjusts SR accordingly.
[IMG]http://i53.tinypic.com/2m6289e.jpg[/IMG]
John
snappychappy wrote:
Use Transend all the time, 8GB cards, never had any issues.
+1 and about half the price of Sandisk comparable speed wise.Use Transend all the time, 8GB cards, never had any issues.
John
Comment by johnwhit posted on Cheap high performance card at 07/04/2011 - 13:23
thoughton wrote:
I've seen good results from the Sigma 70-200s awith TCs, and the Pentax 50-135 with 1.7x TC. Can't think of any other combinations at the moment.
Yes the Sigma 70-200/2.8 works reasonably well with the dedicated 1.4x and 2x TC's I've used them myself and apparently the Sigma 100-300/4 is pretty good as well with the 1.4x, see:I've seen good results from the Sigma 70-200s awith TCs, and the Pentax 50-135 with 1.7x TC. Can't think of any other combinations at the moment.
http://www.photozone.de/nikon--nikkor-aps-c-lens-tests/369-sigma-af-100-300mm-f4...
Unless Sigma have redisigned the TC's they don't work with SDM or even Sigma's own HSM
It's about time they got that sorted.
John
Hi Howard, great compostion on the 3rd, I really like it, you managed the whole train, the bridge and the signal in the shot!
John
John
Comment by johnwhit posted on Helsby mini meet at 07/04/2011 - 13:08
K10D wrote:
You probably need to consider a different system. It comes down to using the right tool for the job and at present, Pentax do not offer the right tool as far as glass in concerned.
The down side is cost. Long, fast glass with or without matching TC's means large sums of money.
Best regards.
You mean to say buy a CanikonYou probably need to consider a different system. It comes down to using the right tool for the job and at present, Pentax do not offer the right tool as far as glass in concerned.
The down side is cost. Long, fast glass with or without matching TC's means large sums of money.
Best regards.
Why not try one of these:
http://www.sigma-imaging-uk.com/lenses/telephoto/500mm.htm
In Pentax fit of course, a snip at £4799.99 or even cheaper if you shop around
Or maybe a secondhand Sigma 400/5.6 APO TELE MACRO £350 for a good one if money is tight.
John
Frogfish wrote:
Not really strange and absolutely true ... you need to guess and then input via the menu (or switch your camera off and on in between every change of focal length) the FL with a zoom if you want your SR to work accurately and not affect (blur) your shots !
That won't work with a modern AF lens on a Penta DSLR as the camera obtains the FL automatically. If I fit the DA* 300/4 + 1.4, 1.5, or 1.7x TC to the K20D (420, 450 or 510mm) the camera still sees the lens as 300mm!Not really strange and absolutely true ... you need to guess and then input via the menu (or switch your camera off and on in between every change of focal length) the FL with a zoom if you want your SR to work accurately and not affect (blur) your shots !
So it's time to switch SR off and get the tripod out, unless you use an old manual focus TC with no contacts on the back and then you lose AF
John
kkpb7897 wrote:
This is a used pentax 16- 45mm Lens Hood. I thought i had lost mine so bought another one. I have since found it hence the sale.
Would you like another to keep it companyThis is a used pentax 16- 45mm Lens Hood. I thought i had lost mine so bought another one. I have since found it hence the sale.
I found mine when I discoverd the soft case for the DA 16-45 also fits the DA 17-70 and there it was in the case
John
Comment by johnwhit posted on Pentax 16- 45mm 67mm Lens Hood (PH -RBL 67mm) at 06/04/2011 - 16:48
John