Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-24-2015, 03:12 PM   #1
New Member




Join Date: Jul 2015
Posts: 5
1.4 extender for 80-320 lens

Very amateur photographer here!
I have a K-5II body with a SMC 80-320 1:4.5-5.6 telephoto lens
I'm looking to extend my range with a 1.4X HD Pentax DA AF
Will this work?
What are pros and cons?
What would be a better or less expensive way to accomplish this?
Thanks in advance for any help you can give me.

07-24-2015, 03:22 PM   #2
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,872
A less expensive way would be to find a Vivitar Series 1 1.4x TC or a Tamron-F 1.4x PZ-AF MC4.

Tamron-F 1.4X Pz-AF MC4 Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database

The Vivitar is the same as the Tamron but doesn't have the power zoom contacts.

The cons are that the tele-converter will magnify the shortcomings of the 80-320.

I thought the Vivitar worked great with the 55-300

07-24-2015, 03:59 PM   #3
Site Supporter




Join Date: Feb 2011
Location: Syracuse, NY
Posts: 644
The Pentax DA converter says that it is not compatible with the smc 80-320 lens. Probably because the rear element of the 80-320 may or will come into contact with the front element of the converter, potentially causing damage to either or both the converter and the lens. Not sure if other converters pose the same risk.

With that said, the DA converter is the best quality converter for lenses that it is compatible with.

Link to compatibility chart: http://c758710.r10.cf2.rackcdn.com/files/support/manual/1394730000_DA_Rear_c...lity_Chart.pdf
07-25-2015, 06:10 AM   #4
New Member




Join Date: Jul 2015
Posts: 5
Original Poster
QuoteOriginally posted by transam879 Quote
The Pentax DA converter says that it is not compatible with the smc 80-320 lens. Probably because the rear element of the 80-320 may or will come into contact with the front element of the converter, potentially causing damage to either or both the converter and the lens. Not sure if other converters pose the same risk.

With that said, the DA converter is the best quality converter for lenses that it is compatible with.

Link to compatibility chart: http://c758710.r10.cf2.rackcdn.com/files/support/manual/1394730000_DA_Rear_c...lity_Chart.pdf
Thanks, so much.
You saved me some serious grief .

07-25-2015, 10:41 AM   #5
Site Supporter




Join Date: Feb 2011
Location: Syracuse, NY
Posts: 644
QuoteOriginally posted by Deanjaw Quote
Thanks, so much.
You saved me some serious grief
DA converter probably works best with higher quality lenses but is probably the best converter out there. Most of the lenses that it isn't compatible with are wider angle primes, which you normally wouldn't use a converter with anyways. If you don't have higher quality lenses and still want a converter the Tamron-F 1.4x converter is probably the next best thing (that supports AF) or for manual focus I've heard the Pentax-A 1.4x converter is really good too. Just wouldn't use them on the 80-320. If you have any other long lenses (ie Pentax DA 55-500) they should be be fine to use with a converter.
07-26-2015, 05:46 AM   #6
New Member




Join Date: Jul 2015
Posts: 5
Original Poster
Another option, way more cost, would be Sigma APO-OS-HSM 50-500 F4-5-6 3
AF lens for my Pentax?
Or would I be just as well off with a Pentax DA 55-500?
Thanks again in advance for your advice.
07-26-2015, 10:18 AM   #7
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,872
QuoteOriginally posted by Deanjaw Quote
Or would I be just as well off with a Pentax DA 55-500?
I wish Pentax made a 55-500...

I have a Sigam 150-500, a better option than the 55-300 with a TC. But it is much heavier...and not WR.

You also tend to draw a lot of attention with a Bigma. Though yesterday I saw a guy with a Nikon 600/4, combined with a shutter that sounds like a machine gun! I felt like I was very stealthy...

https://www.pentaxforums.com/forums/122-lens-clubs/55946-300mm-plus-lens-club...ng-lenses.html

Last edited by boriscleto; 07-26-2015 at 10:26 AM.
07-31-2015, 11:57 AM   #8
New Member




Join Date: Jul 2015
Posts: 5
Original Poster
Still looking
Thanks for all info
How about Sigma 170-500 lens?
Would this be a better/serviceable option?

07-31-2015, 12:42 PM   #9
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,872
QuoteOriginally posted by Deanjaw Quote
Still looking
Thanks for all info
How about Sigma 170-500 lens?
Would this be a better/serviceable option?
If it's the DG version, yes. It might even work with a 1.4x converter since it isn't HSM. Sigma HSM doesn't play well with teleconverters, on Pentax anyway, and Sigma never made a HSM converter for K-mount.
08-01-2015, 05:53 AM   #10
New Member




Join Date: Jul 2015
Posts: 5
Original Poster
QuoteOriginally posted by boriscleto Quote
If it's the DG version, yes. It might even work with a 1.4x converter since it isn't HSM. Sigma HSM doesn't play well with teleconverters, on Pentax anyway, and Sigma never made a HSM converter for K-mount.
Thanks again for all your help
08-01-2015, 06:51 AM   #11
Senior Member




Join Date: Oct 2008
Location: bev
Posts: 178
QuoteOriginally posted by Deanjaw Quote
Thanks again for all your help
I would buy the used DA-L 55-300 in the marketplace for $150 and a Tamron 1.4 converter. People crap on the L lenses for no quickshift but its a feature that I don't use too often. And the L, saves you a lot of money, close to $100. Same optics as the more expensive version. I think that is going to be the best quality and price combo you will get. Plus you can sell your current lens for maybe half of the DAs price!
08-01-2015, 07:47 AM   #12
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 9,843
The incompatibility may also be due to the high minimum f stop of the lens. Ricoh say that to avoid focus issues - btw I have the FA version of that lens and in a shoot out with the DA 55-300 it was clearly not as good in terms of purple fringing and critical sharpness. I suspect using it with a teleconverter will be hit or miss.
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!
camera, lens, pentax help, photography, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear lens extender 1.4, by pentax, whats the VERDICT?? photoramone Pentax SLR Lens Discussion 13 01-24-2015 11:28 AM
For Sale - Sold: SMCP-FA 80-320 mm F/4.5.-5.6 akptc Sold Items 5 08-08-2014 09:21 AM
DSLR body for pentax old 35-80/80-320 lenses MZ5_SLR Troubleshooting and Beginner Help 4 10-12-2011 01:10 AM
Lens hood for Pentax 80-320? Arpe Pentax SLR Lens Discussion 10 02-23-2007 02:50 PM



All times are GMT -7. The time now is 08:48 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