Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-24-2019, 11:48 AM   #16
Veteran Member

Join Date: Aug 2011
Location: new Albany IN
Posts: 678
Original Poster
my foggyness

please excusse my old brain for not comprehending this. please correct me, k-1 with a 55-300 da hd 4-5.8 ed wr lens will give me 450mm in the crop mode and if i ad the 1.4 tela converter i would get 630mm ?
second senerio. k1 dfa* 70-200 in crop mode =300mm and with the1.4 tela =420mm?

03-24-2019, 12:12 PM   #17
Loyal Site Supporter
Loyal Site Supporter
monochrome's Avatar

Join Date: Mar 2008
Location: Working From Home
Photos: Gallery | Albums
Posts: 26,269
QuoteOriginally posted by UncleVanya Quote
Like Sandy mentioned putting it on the Kp, K3, K3ii, K70, etc. will get 24mp into the crop zone of the lens which is more than the 16mp in the crop zone you get from the K1 in crop mode - allowing for higher detail when you need reach. It is likely that the DA 1.4x would work both in K1 crop mode and on the crop cameras without limitations but I don't have any direct evidence of this.

---------- Post added 03-22-19 at 11:07 AM ----------

While this is true of the AF TC's the 1.4x-S and 2x-S manual focus converters (A series or not) will not transmit the SR data and allow the body to be set to whatever SR value you want - if manual focus is sufficient.

My past experiments using the 1.4x-S vs. the DA 1.4x lead me to think the 1.4x-S A version is very close to the same performance at least with my FA* 300 f4.5 used on a K-3.

The 1.4x-S should also cover the FF sensor without problems.
Ditto. I have a KP and have also used it with A1.4x-S with FA*300/4.5. IMO the A1.4x-S is the best of the TC lot.
03-24-2019, 05:07 PM - 1 Like   #18
Site Supporter
Site Supporter

Join Date: Oct 2013
Location: Melbourne
Photos: Gallery
Posts: 91
DA 1.4x with FDA 70-200 on K1ii images

I often use the DA 1.4x with the DA* 300 on my K1ii. However, I was on vacation a couple of months ago and the SDM failed on my 300 so I put my DFA 70-200 in its place. I have attached the landscape photo at 70mm (98mm with TC) and the bird at 200mm (280mm with TC) so that you can see the vignetting and corner issues. Otherwise the combination works well. Both photos are uncropped and taken in FF mode, not crop mode.
Attached Images
View Picture EXIF
PENTAX K-1 Mark II  Photo 
View Picture EXIF
PENTAX K-1 Mark II  Photo 
03-24-2019, 05:42 PM   #19
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 37,194
QuoteOriginally posted by UncleVanya Quote
I would defer to Norm - he has a lot of experience with this. Norm what about the F 1.7x converter?
The 1.7x converter is awesome, the subject ones out of range and you have to refocus. It acts as a focus limiter for some of the fastest AF anywhere as long as the subject stayss within range. But if your subject is moving around a lot it's a pain in the derriere. Many days it really depends on how good the manual focusing action is on the lens you use it with. Awesome on my Tamron 300 2.8, not so good on my DA* lenses.

Last edited by normhead; 03-24-2019 at 05:55 PM.

  • 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!
1.4x, converters, crop, da, focus, k-mount, lens, pentax lens, slr lens, sr, zone
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
From Sigma 70-200mm HSM DG to Pentax D-FA 70-200mm Malsi Pentax SLR Lens Discussion 11 12-03-2017 08:15 PM
Anyone tried the Kenko Teleplus DG 1.4X MC4 Teleconverter with the Tamron SP 70-200mm TheGrandPrixKid Pentax Camera and Field Accessories 3 04-16-2016 07:10 AM
For Sale - Sold: Sigma EX 70-200mm f2.8 + 1.4x EX DG Teleconverter Mile High Sold Items 5 02-14-2010 02:32 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 10:12 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]