Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-01-2015, 02:32 AM   #1
Senior Member




Join Date: Nov 2014
Posts: 175
Anyone using a Teleconverter with K30?

I was intrigued by the review on this one (Pentax-DA 1.4x AW AF Rear Converter Review - Introduction | PentaxForums.com Reviews ) and I thought it could afford me some extra reach for my wildlife shoots while I master my Sigma 70-300 and wait for the right opportunity to get a Sigma 150-500.

Thanx

07-01-2015, 05:37 AM   #2
Pentaxian
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 2,623
...you want to "get by" with a 400 Euros (not 40E) TC and get mediocre shots while "saving" for a lens that you can find used for about double that amount, even less?
07-01-2015, 06:10 AM   #3
Senior Member




Join Date: Nov 2014
Posts: 175
Original Poster
If I could find an used Sigma 150-500 for THAT amount I'd be over it in a heartbeat...problem is I haven't seen many of those going for less than 600/700€...while it goes for 780€ new...

Last edited by gerax; 07-01-2015 at 06:17 AM.
07-01-2015, 06:49 AM   #4
Pentaxian
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 2,623
QuoteOriginally posted by gerax Quote
If I could find an used Sigma 150-500 for THAT amount I'd be over it in a heartbeat...problem is I haven't seen many of those going for less than 600/700€...while it goes for 780€ new...
Couple examples:

Sigma 150-500mm f5-6.3 DG OS HSM Lens - Pentax Fit 0085126737566 | eBay
776 Euros plus postage, if you're from the UK you're in luck.
Listed as ex-demo with minor marks on collar, not my insertion..

07-01-2015, 07:57 AM   #5
Senior Member




Join Date: Nov 2014
Posts: 175
Original Poster
SIGMA 150-500mm F/5-6.3 APO DG HSM - PENTAX - 4 ANNI DI GARANZIA
...and it's juts a few miles from my house...so this is what I was talking you about...difficult to find an used one for less that I can have it for in this store.
07-01-2015, 08:03 AM   #6
Pentaxian
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 2,623
QuoteOriginally posted by gerax Quote
SIGMA 150-500mm F/5-6.3 APO DG HSM - PENTAX - 4 ANNI DI GARANZIA
...and it's juts a few miles from my house...so this is what I was talking you about...difficult to find an used one for less that I can have it for in this store.
I still don't get it... you're ok with basically wasting 400E while trying to save for less than 800?
I'd skip it, since TCs only worsen flaws in a given lens, and I wouldn't put my money on a budget zoom lens...
07-01-2015, 08:31 AM   #7
Senior Member




Join Date: Nov 2014
Posts: 175
Original Poster
I've seen the Sigma Teleconverter go used for like 200€... but I just wanted an opinion on whether it could be a viable solution or not since the review gave it decent points.
If you say it's not I take your point.
07-01-2015, 08:44 AM   #8
Pentaxian
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 2,623
QuoteOriginally posted by gerax Quote
I've seen the Sigma Teleconverter go used for like 200€... but I just wanted an opinion on whether it could be a viable solution or not since the review gave it decent points.
If you say it's not I take your point.
Maybe decent points with a prime or a high-tier zoom?

Let's put it this way, with a 1.4x TC you'd get a soft 420mm f/8.
I don't think AF can work that thing very well, it starts getting too dark for the machine.

With a TC you're putting your picture in a sort of photographical coffin corner... no stall speed here, but diffraction limit and minimum acceptable sharpness.
Let's say your Sigma starts to get ok at f/8 and has its peak at f/11, you'd work it between f/11 and f/16, the latter being a little too much for an APS-C 16Mp sensor.
That, without considering how every little flaw of the lens is going to be magnified as well (PF, softness etc.).

I think the best option for the moment is to crop and resize with an intelligent algorithm (Alien Skin's perhaps? or a simple bicubic would do), because it's probably giving you better or equal detail than a TC.

07-01-2015, 08:53 AM   #9
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
You could get something like a Kenko 1.5 or Tamron 1.4 if you have money you'd rather not keep to wait till you can get the big zoom.
If your sigma is HSM it may not auto focus with any teleconverter.
If you want to go a little cheaper the older 170-500 sigma has pretty good reach and quality.

Main thing though is in our desire for reach we try to come up with cheaper solutions but all have drawbacks and may not give the results you want.
As previously advised it is better just to bite the bullet and spend for the long lens vs waste money on your road there.
07-01-2015, 06:17 PM   #10
Senior Member
Inexorable's Avatar

Join Date: Jul 2012
Location: Noida, UP
Posts: 145
QuoteOriginally posted by gerax Quote
I was intrigued by the review on this one (Pentax-DA 1.4x AW AF Rear Converter Review - Introduction | PentaxForums.com Reviews ) and I thought it could afford me some extra reach for my wildlife shoots while I master my Sigma 70-300 and wait for the right opportunity to get a Sigma 150-500.

Thanx
I use the converter with my K-30 for birding and am extremely satisfied. The drop in IQ, if any, is minor.
07-02-2015, 01:58 AM   #11
Loyal Site Supporter
Loyal Site Supporter
clackers's Avatar

Join Date: Jul 2013
Location: Melbourne
Photos: Albums
Posts: 9,207
I use it on my K-30 and it works fine. You may have trouble getting AF with your slow lens.
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!
k-30, k-50, pentax k30, pentax k50, review, sigma
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone using the new Teleconverter with 18mm - 135mm WR? debkim Pentax SLR Lens Discussion 10 05-29-2014 08:49 AM
Anyone using an external mic with a K3 dhodgeh Pentax K-3 13 12-17-2013 06:29 AM
Using a Tokina 70-210mm 1:4-5.6 with new K30 CincySig Pentax SLR Lens Discussion 7 03-30-2013 11:51 AM
Anyone using a Camera Backpack with a Tamron Adaptall 300mm F2.8 68wSteve Pentax Camera and Field Accessories 13 12-02-2012 05:15 PM
Anyone use a teleconverter with the Sigma 50-150? JHD Pentax SLR Lens Discussion 4 10-10-2011 11:45 AM



All times are GMT -7. The time now is 04:36 AM. | 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