Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-29-2009, 07:16 AM   #31
Veteran Member
bwield's Avatar

Join Date: Mar 2008
Posts: 444
Indeed

QuoteOriginally posted by Digitalis Quote
The 100-300mm f/4 EX DG suffers quite badly from that particular optical aberration it also suffers from transverse chromatic aberration (blue fringes at the extremeties of the frame) at distances approaching it's minimum focusing mark of 1.8m . I haven't tested this lens with a tele-converter but I have heard reports that with a Tamron 1.4 TC it doesn't lose much in terms of image quality.

Another irritating thing about this lens is that it is very prone to flare - even with the hood on. And i'm using the latest DG version of the lens, if only sigma would improve their lens coatings!
While a very good lens it does not do double duty as a good macro.
I have not experienced the haloing (or flare) issue at anything but the minimum focusing distance, or relatively close to the minimum.

I was very impressed with its performance, both optical and esp the focusing speed when I did a soccer game recently.

07-29-2009, 07:24 AM   #32
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,535
It's extremely good a mid to long distances, I usually shoot with it at f/5.6 to keep the contrast at a consistent level throughout the entire zoom range (you will lose some contrast at 300mm @ f/4 but the resolution is still surprisingly high) but when things get 4m and closer, I usually stop down to f/8 ~ f/11 to keep the quality at a high level.
07-29-2009, 07:33 AM   #33
Veteran Member
bwield's Avatar

Join Date: Mar 2008
Posts: 444
Hmm

QuoteOriginally posted by Digitalis Quote
It's extremely good a mid to long distances, I usually shoot with it at f/5.6 to keep the contrast at a consistent level throughout the entire zoom range (you will lose some contrast at 300mm @ f/4 but the resolution is still surprisingly high) but when things get 4m and closer, I usually stop down to f/8 ~ f/11 to keep the quality at a high level.
I had wondered if it was just my copy, but I guess not!
My findings have been exactly the same.
I am now in the market for a good macro so the 100-300 is only used in its best range
07-29-2009, 07:23 PM   #34
Junior Member




Join Date: Feb 2008
Posts: 36
I gotten this lens not too long ago and I like to ask the experience users about when using a TC, does the TC send the correct FL data to the camera for the SR to work correctly? Like using a 1.4x and zoom to 300mm and the camera read it as 420mm?

07-30-2009, 03:52 AM   #35
Veteran Member
OrenMc's Avatar

Join Date: Apr 2008
Location: USA
Photos: Gallery
Posts: 1,902
Here is a shot with the Tamron 1.4X and I was only about 3 or 4 meters away at F4. Handholding.



I didn't have the lens very long at that time and was relatively new to all of this so my skills didn't help much but it is a good example on how sharp it is with Tamron TC.

Last edited by OrenMc; 07-30-2009 at 08:23 PM.
07-30-2009, 05:50 AM   #36
Junior Member




Join Date: Feb 2008
Posts: 36
Nice one. What focal length did the camera read?
07-30-2009, 08:17 PM   #37
Veteran Member
OrenMc's Avatar

Join Date: Apr 2008
Location: USA
Photos: Gallery
Posts: 1,902
QuoteOriginally posted by simdavid Quote
Nice one. What focal length did the camera read?
I had to go back and check that one. K10D - F4, 1/180 sec, ISO 400 @160mm. Its a bit of a crop also and if I had to guess what percentage I'ld say 30%. There is of course a little sharpening for the web and downsize.

I just got the 70-200 in the mail today and its a dud. Won't forcus, not even manual. Damn QC.
Anyway, it looks just like a little mini-me. I know I am going to be darn happy when I get my hands on a good one.

Last edited by OrenMc; 07-30-2009 at 08:22 PM.
07-31-2009, 08:47 PM   #38
Junior Member




Join Date: Feb 2008
Posts: 36
Sorry to hear that about the 70-200. I heard many good things about it and I'm sure you will be please when you get a good one.

08-01-2009, 10:21 AM   #39
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 8,588
Here's one from mine w/1.4 TC.
08-03-2009, 04:18 AM   #40
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,535
the bokeh in the lower portion of that image looks a bit disturbing..
08-03-2009, 04:37 AM   #41
Veteran Member




Join Date: Jun 2009
Photos: Albums
Posts: 1,679
QuoteOriginally posted by OrenMc Quote
I had to go back and check that one. K10D - F4, 1/180 sec, ISO 400 @160mm. Its a bit of a crop also and if I had to guess what percentage I'ld say 30%. There is of course a little sharpening for the web and downsize.

I just got the 70-200 in the mail today and its a dud. Won't forcus, not even manual. Damn QC.
Anyway, it looks just like a little mini-me. I know I am going to be darn happy when I get my hands on a good one.
If you had a 1.4x TC then it was shot at F5.6 not F4 and the min aperture is changed from F4 to F5.6 with a 1.4x TC...and since it starts at 100mm that means the 160mm was 210mm thanks to the TC. So then the camera might not have reported the effect of the TC...I wonder of the Tamron 1.4x TC does not report properly to the camera, well, at least on the K10D. Something to remember when using SR...I think the 1/180th saved ya here....still a super shot!!

These darned TC as so fussy!!
08-03-2009, 04:40 AM   #42
Veteran Member




Join Date: Jun 2009
Photos: Albums
Posts: 1,679
QuoteOriginally posted by wtlwdwgn Quote
Here's one from mine w/1.4 TC.
What TC were ya using? Model & brand would sure help us out here hunting a TC that reports the correct info to the camera. I ask because yours reports f4 & 300mm so it would seem it is actually F5.6 & 420mm?

Nice color and composition/crop...the detail level is really nice!

I love bear shots...still the farther away I am from them the happier I am...hehehe...love the expressions on their faces.
08-03-2009, 04:42 AM   #43
Senior Member




Join Date: Mar 2007
Location: Blue Mountains, NSW
Photos: Gallery
Posts: 217
Big G with the cash splash ... yet another stellar purchase .... thats spome arsenal your building up.
08-03-2009, 07:48 AM   #44
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,535
when combined with an AF-540 flash, the sigma 100-300 f/4 EX DG really shows how valuable the constant aperture is. The only hard part is to get the flash to look natural.

Last edited by Digitalis; 08-31-2010 at 05:22 PM.
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!
100-300mm, apo, apo ex dg, autofocus, dg, f/4, k-mount, pentax lens, shots, slr lens, test, youtube
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Sigma 100-300mm f4 EX DG + Sigma 1.4x DG EX APO tcon (AUS) David Glazebrook Sold Items 36 02-06-2010 01:03 PM
For Sale - Sold: Sigma 100-300mm f4 ex dg apo borno Sold Items 1 08-22-2009 12:15 PM
Sigma 100-300mm APO f/4 Derridale Pentax SLR Lens Discussion 30 09-12-2008 02:39 PM



All times are GMT -7. The time now is 03:52 AM. | See also: NikonForums.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