Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-07-2014, 09:11 AM   #31
Veteran Member
awaldram's Avatar

Join Date: May 2008
Location: Hampshire
Photos: Gallery
Posts: 720
QuoteOriginally posted by derekkite Quote
I don't have mine yet, but I find the reach of the DA*300 is limited by the ability to get accurate focus. Even on the K-3 having the subject magnified so that it can lock focus will help. I expect a slight degradation in IQ, I don't think that can be avoided. Last summer the 150-500 sigma, although not equal to the IQ of the DA*300 got more keepers because it allowed focus. If the subject was in focus, the cropped DA*300 shots were better, but with the realities of wildlife shooting, with moving targets and busy scenes in dodgy light, getting that focus was a challenge.
With you 100% on this cropping is so good I'm rarely limited good glass achieves reasonable results even at 100%.

But getting the image sharp when its a pin prick is more challenging and where all my lens run out of go, whether I'm using 300, 400 or 500

So a good AF TC will allow me to achieve the reach the cropping allows.

03-07-2014, 10:07 AM   #32
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 25,085
Heres a few more images for you to look at..
A few quick images from this morning...

A crow stopped by up on the hill. The impressive thing to me in this shot is the crow is at least 40 meters away from me, the image is cropped to maybe 50% of it's original size and it still shows good feather detail. I'm not sure you could make the argument this shot could have been as good without the TC.



And of course, your usual squirrel images.







Full reach image 60-250 with 1.7 (shows as 450 in exif)



Full reach image 60-250 with 1.4 (show as 350mm in exif)


Full reach image 60-250 (shows as 250 in exif)


60-250 with 1.7 scaled as close as I could guestimate to 250..


60-250 with 1.4 exif says 252 mm.


The new TC 1.4 is definitely easier to use, calculates your focal length with the TC on and will probably live on my 60-250 when needed. The 1.7 TC is more difficult to use. But after the initial focus, the short throw of the TC acts as a limiter making AF very quick, it has noticeably more reach, but it doesn't accurately report the change in zoom setting, reporting everything as the max. available setting, so my 250 mm image (above) in the exif show 450.

The 1.7 also ads partial AF to MF lenses which the 1.4 does not.

I'm planning on keeping both.
03-07-2014, 12:39 PM   #33
Site Supporter
jpzk's Avatar

Join Date: Jan 2009
Location: Québec
Photos: Gallery | Albums
Posts: 7,201
QuoteOriginally posted by stormtech Quote
I'm watching this closely also. I don't mind paying the price for a quality accessory like this, but have to prove to myself that it is worth it.

I would be using it with my DA* 300 on my K-5IIs. I just can't see how this TC would be much better than cropping that little bit.
Kudos !
Eagerly awaiting results taken with this TC and the DA*300/4.

JP

---------- Post added 03-07-14 at 02:42 PM ----------

QuoteOriginally posted by imtheguy Quote
Originally posted by jpzk Thanks a bunch to you two ! @ imtheguy ... In terms of IQ, if I were to compare the shots taken with the DA*300/4 with/without the TC, what is your "rating" from your posted images ?
JP I really cant rate it yet from just a single set of indoor shots, but at least did not see anything discouraging.....was soooooo looking forward to sunlight today but not getting that wish.
Thanks for the input, much appreciated.
I am looking forward to some shots "in good daylight" conditions!

Cheers!

JP
03-07-2014, 02:11 PM   #34
Veteran Member
stormtech's Avatar

Join Date: Jan 2011
Location: In the boonies (NW Penna)
Photos: Gallery | Albums
Posts: 5,670
QuoteOriginally posted by derekkite Quote
I don't have mine yet, but I find the reach of the DA*300 is limited by the ability to get accurate focus. Even on the K-3 having the subject magnified so that it can lock focus will help. I expect a slight degradation in IQ, I don't think that can be avoided. Last summer the 150-500 sigma, although not equal to the IQ of the DA*300 got more keepers because it allowed focus. If the subject was in focus, the cropped DA*300 shots were better, but with the realities of wildlife shooting, with moving targets and busy scenes in dodgy light, getting that focus was a challenge.
Very good point! I'm keeping an open mind about this and appreciate your theory - it does make sense to me.

03-07-2014, 02:16 PM   #35
Loyal Site Supporter
imtheguy's Avatar

Join Date: Mar 2009
Location: Virginia Beach
Photos: Gallery | Albums
Posts: 2,950
QuoteOriginally posted by derekkite Quote
I don't have mine yet, but I find the reach of the DA*300 is limited by the ability to get accurate focus. Even on the K-3 having the subject magnified so that it can lock focus will help. I expect a slight degradation in IQ, I don't think that can be avoided. Last summer the 150-500 sigma, although not equal to the IQ of the DA*300 got more keepers because it allowed focus. If the subject was in focus, the cropped DA*300 shots were better, but with the realities of wildlife shooting, with moving targets and busy scenes in dodgy light, getting that focus was a challenge.
and thats why i always shoot in Hi-Drive mode for long distance and moving subjects. At least 3 frames with varying degrees of focus usually yield at least one perfect focus.
03-07-2014, 02:45 PM   #36
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 25,085
OK, since I was interested, I went out again... this time, 3 shots at each setting picked the best of each,

The scene shot at 250mm.


The test chart, cropped to the size of the chart @250mm.


The test chart, cropped to the size of the chart @350mm. DA*60-250 + 1.4


The test chart, cropped to the size of the chart @400 mm (A-400)


The test chart, cropped to the size of the chart @450mm. DA* 60-250 + F 1.7 TC


The test chart, cropped to the size of the chart @560 mm (A-400 +1.4 TC)


The trend seems to be a constant improvement with longer focal length. No apparent degradation of the image due to TC use. IN this series the A-400 came out better than the DA*60-250 with the 1.4. I might have to devise a tie break.
03-07-2014, 03:04 PM   #37
Pentaxian




Join Date: Sep 2011
Location: Nelson B.C.
Posts: 3,246
Original Poster
QuoteOriginally posted by normhead Quote
OK, since I was interested, I went out again... this time, 3 shots at each setting picked the best of each,

The scene shot at 250mm.


The test chart, cropped to the size of the chart @250mm.


The test chart, cropped to the size of the chart @350mm. DA*60-250 + 1.4


The test chart, cropped to the size of the chart @400 mm (A-400)


The test chart, cropped to the size of the chart @450mm. DA* 60-250 + F 1.7 TC


The test chart, cropped to the size of the chart @560 mm (A-400 +1.4 TC)


The trend seems to be a constant improvement with longer focal length. No apparent degradation of the image due to TC use. IN this series the A-400 came out better than the DA*60-250 with the 1.4. I might have to devise a tie break.
Thanks for this. I'm wondering if the first shot was suffering from inaccurate focus. Any detail that it could focus on would be too small for the 250mm.
03-07-2014, 03:50 PM   #38
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,796
First cropped shot has motion blur - was it windy?

03-07-2014, 04:11 PM   #39
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 25,085
QuoteOriginally posted by crewl1 Quote
First cropped shot has motion blur - was it windy?
That could have been it...

A few more images, this time using the Sigma 70 macro and 1.4 TC.. which registers as a 98mm ƒ4.

K-3 SIgma 70 macro with HD DA 1.4 TC

Wide open at ƒ4


Stopped down to ƒ22


Up close and personal @ ƒ22

Last edited by normhead; 03-08-2014 at 07:17 AM.
03-09-2014, 12:17 PM   #40
Pentaxian
panoguy's Avatar

Join Date: Sep 2007
Location: Washington, D.C.
Photos: Gallery | Albums
Posts: 3,290
QuoteOriginally posted by normhead Quote
A few more images, this time using the Sigma 70 macro and 1.4 TC.. which registers as a 98mm ƒ4.

K-3 SIgma 70 macro with HD DA 1.4 TC

Wide open at ƒ4
Looks like a nice combo for a 100mm macro! Your working distance is longer or the same? It's been a while since I used a TC on a macro lens... (unless you count the Vivitar 2x macro-focusing TC.)
03-21-2014, 05:48 PM   #41
Forum Member




Join Date: Jul 2011
Location: Essex
Posts: 98
QuoteOriginally posted by normhead Quote
Cross posted from that other TC thread.
A few questions answered...it works pretty much seamlessly, it works on third party lenses, it allows you to use selective focus, works seamlessly on either SDM of screw drive, ... and it tells the exif file what it's doing... I didn't have a lot of time with it today... but I got out late.

On the DA * 60-250 (SDM)



On the Tamron 90 Macro (screw drive).
As an aside, is that last one with the Tamron 90 a big crop? It looks very noisy for ISO 800. I'm finding my K3 quite noisy with blue skies at relatively low ISO as well.
03-21-2014, 07:18 PM   #42
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 25,085
QuoteOriginally posted by dc1500 Quote
As an aside, is that last one with the Tamron 90 a big crop? It looks very noisy for ISO 800. I'm finding my K3 quite noisy with blue skies at relatively low ISO as well.
The noise on the bird is because he's backlit on a bright sky and dodged, contrasted etc.... I'm, not seeing the sky as all that bad, although I know what you're talking about.

With the F-70-210 and DA 1.4 TC on the camera I went looking for some purple fringing... and didn't find any... this lens definitely has purple fringing problems with the 1.7

The finches on this tree remind me of Christmas decorations...

There seems to be more and more noise every day.... and they are definitely sparring to establish territory, after living together all winter the nuthatches and woodpeckers are definitely getting into it.






Last edited by normhead; 03-22-2014 at 10:55 AM.
03-30-2014, 02:36 PM   #43
Forum Member




Join Date: Jul 2011
Location: Essex
Posts: 98
They are great shots. Really sharp and as you say no PF.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
canada, da*300/4, jp, k-mount, pentax lens, pentax news, pentax rumors, post, shots, slr lens, stop, tc, thanks, weather
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Difference.. Auto Teleconverter/Teleconverter? peter oconnor Pentax SLR Lens Discussion 6 04-28-2013 03:11 PM
For Sale - Sold: K100D Body ($120 Shipped)SOLD, Cosmicar (A) 35-70 f/4 ($35 Shipped) zbrueningsen Sold Items 2 06-02-2012 01:47 PM
For Sale - Sold: Kiron MC7 2X Teleconverter for PK/A - $39 shipped dgaies Sold Items 2 09-28-2011 08:21 PM
For Sale - Sold: Tamron 1.4x Pz-AF MC4 Teleconverter & Quantaray 2x Teleconverter DaveInPA Sold Items 15 09-24-2009 06:28 AM



All times are GMT -7. The time now is 12:20 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top