Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-27-2017, 04:56 PM   #1
Forum Member




Join Date: Oct 2017
Posts: 76
Teleconverter vs Post Crop

Bismillah

I have the DA*200mm f2.8 and a KP but want more reach. What is the advantage to getting a 1.4x teleconverter? Can I reproduce the same or better IQ by cropping in post?
Also can I crop again effectively after using a teleconverter on a crop sensor? Thanks.

12-27-2017, 05:19 PM   #2
Otis Memorial Pentaxian
Loyal Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising the forum watching his back
Photos: Gallery | Albums
Posts: 12,621
Moved to the correct forum. Product suggestions and feedback is about what you'd like to see Ricoh create. It's not the place for your questions.
12-27-2017, 05:21 PM   #3
Forum Member




Join Date: Oct 2017
Posts: 76
Original Poster
QuoteOriginally posted by photolady95 Quote
Moved to the correct forum. Product suggestions and feedback is about what you'd like to see Ricoh create. It's not the place for your questions.
Bismillah

Sorry. Lessons learned for me. Thanks.
12-27-2017, 05:30 PM   #4
Site Supporter
Site Supporter
mikeSF's Avatar

Join Date: Jan 2009
Location: East Bay Area, CA
Photos: Gallery
Posts: 6,253
TC pairings and resulting IQ are very specific to each piece of gear involved. In my experience, I have a rig where using a 1.4x or a 2.0x TC is ALWAYS better than cropping at a given focal length. I also have tested several combinations whereby it is better to crop. Maybe someone in here will have specific experience with the DA*200

12-27-2017, 05:37 PM   #5
Pentaxian
jddwoods's Avatar

Join Date: Nov 2012
Location: Newark, Delaware
Posts: 966
The 1.4 TC works best with faster lenses of f4.0 or faster. That said it is a good match with your DA* 200. it will make it an 280 mm f4.0 lens. I have both and they work well together.
12-27-2017, 05:46 PM - 1 Like   #6
Loyal Site Supporter
Loyal Site Supporter
pschlute's Avatar

Join Date: Mar 2007
Location: Surrey, UK
Photos: Gallery
Posts: 4,343
QuoteOriginally posted by halimj7 Quote
Bismillah

I have the DA*200mm f2.8 and a KP but want more reach. What is the advantage to getting a 1.4x teleconverter? Can I reproduce the same or better IQ by cropping in post?
Also can I crop again effectively after using a teleconverter on a crop sensor? Thanks.
Assuming you use a good quality teleconverter, you are changing the focal length of the glass in front of your camera's sensor from 200mm to 280mm. This gives you greater magnification although the downside is you will lose some light.

By cropping a non-TC image (200mm) to the same image size as a TC image (280mm) you will be losing resolution. Will that be noticeable ? Depends on the quality of the TC (a poor quality one would even give you a worse image). A good quality TC should give you a better image quality, but the KP has a good sensor to start with and without knowing what you want to do with your images (view online or print) I would suggest it may be marginal.

Of course you can crop again, and this is where the TC may be advantageous. If you find you crop a lot you should always get a better result from cropping less with the TC (a good quality one) than cropping more without it.
12-27-2017, 05:46 PM   #7
Forum Member




Join Date: Oct 2017
Posts: 76
Original Poster
QuoteOriginally posted by jddwoods Quote
The 1.4 TC works best with faster lenses of f4.0 or faster. That said it is a good match with your DA* 200. it will make it an 280 mm f4.0 lens. I have both and they work well together.
Bismillah

Thanks for your response. With the APS-C crop that would be around a 420mm focal length right? How does that combo hold up to additional cropping in post? Thanks again.
12-27-2017, 06:30 PM - 1 Like   #8
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,603
QuoteOriginally posted by halimj7 Quote
Bismillah

Thanks for your response. With the APS-C crop that would be around a 420mm focal length right? How does that combo hold up to additional cropping in post? Thanks again.
The focal length would be 280mm (doesn't change due to sensor size), but if you got the DA teleconverter then the resulting image quality would be quite good. Another great pairing would be the 300mm F4.


Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

12-27-2017, 07:55 PM   #9
Pentaxian At Large
Loyal Site Supporter
robgski's Avatar

Join Date: Nov 2012
Location: Shenandoah Valley, Virginia
Photos: Gallery | Albums
Posts: 4,362
The ISO you choose will affect resoultion in crop, lower ISO will allow for more croppng with less pixellation . What are you shooting pictures of?
12-27-2017, 08:17 PM - 1 Like   #10
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 35,935
Using the HD DA 1.4 you may as well be using a 300 ƒ4, it is a real lightweight telephoto solution. I also stack the 1.4 with the F 1.7x AF adapter to I've me 476mm ƒ6.3.

Last edited by normhead; 12-28-2017 at 06:52 AM.
12-27-2017, 08:26 PM   #11
Forum Member




Join Date: Oct 2017
Posts: 76
Original Poster
QuoteOriginally posted by Adam Quote
The focal length would be 280mm (doesn't change due to sensor size), but if you got the DA teleconverter then the resulting image quality would be quite good. Another great pairing would be the 300mm F4.
Bismillah

Thanks. How does this combo hold up to additional cropping in post on a APS-C body (my KP)?

---------- Post added 12-27-17 at 08:27 PM ----------

QuoteOriginally posted by robgski Quote
The ISO you choose will affect resoultion in crop, lower ISO will allow for more croppng with less pixellation . What are you shooting pictures of?
Birds primarily.
12-27-2017, 08:38 PM   #12
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,603
Hard to theorize about these things as it really depends on your expectations and exact shooting conditions. But I'd say for birds, the longer the focal length the better.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

12-27-2017, 08:42 PM   #13
Site Supporter
Site Supporter
luftfluss's Avatar

Join Date: Jun 2011
Location: NJ
Photos: Gallery | Albums
Posts: 7,375
QuoteOriginally posted by halimj7 Quote
Bismillah

I have the DA*200mm f2.8 and a KP but want more reach. What is the advantage to getting a 1.4x teleconverter? Can I reproduce the same or better IQ by cropping in post?
Also can I crop again effectively after using a teleconverter on a crop sensor? Thanks.
Current prices at B&H: HD 1.4x TC = $600, DA* 300/4 = $900.
12-28-2017, 06:57 AM   #14
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 35,935
DA* 200 plus HD DA 1.4 TC

DA*200 plus 1.4 slideshow

DA*200 plus F 1.7x AF Adapter Slideshow

DA* 2002.8 and stacked TCs slideshow.

If you have a DA*200 ƒ2.8, adding the TC and AF Adapter is just a no brainer for birds. The lightest most portable way to get to 500mm and by itself the 200 is the longest current 2.8 lens. That can be as important for birding as the longer FL.

Last edited by normhead; 02-04-2018 at 02:50 PM.
12-28-2017, 09:26 AM   #15
Pentaxian
jddwoods's Avatar

Join Date: Nov 2012
Location: Newark, Delaware
Posts: 966
QuoteOriginally posted by halimj7 Quote
Bismillah

Thanks for your response. With the APS-C crop that would be around a 420mm focal length right? How does that combo hold up to additional cropping in post? Thanks again.
As long as you have good light and a lower ISO, 400 and lower you can crop images with the 1.4TC with DA* 200 or DA*300 and still get a good sharpness. I use it on both lenses for shooting birds and am pleased with the results. You lose a bit of sharpness with the TC but it is more than offset by the gain in focal length, especially the DA*300 which becomes a 420mm f5.6 lens combined with the TC.
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!
crop, customer service, iso, k-mount, pentax lens, post, ricoh imaging, slr lens, suggestion, teleconverter, teleconverter vs post
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Nature Good crop, bad crop? c.a.m Photo Critique 26 10-23-2019 01:13 AM
FF mode - DA15 - crop factors & crop sizes acoufap Pentax K-1 21 05-10-2018 09:49 PM
K-5 vs MZ-S vs LX vs PZ-1p vs ist*D vs K10D vs K20D vs K-7 vs....... Steelski Pentax K-5 2 06-28-2017 04:59 PM
To crop or not to crop... wildman Pentax Mirrorless Cameras 8 10-17-2016 09:48 AM
Crop Sensors vs Full Frame :: Crop Or Crap? i83N Photographic Industry and Professionals 44 07-30-2014 06:00 AM



All times are GMT -7. The time now is 06:17 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