Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-13-2022, 02:24 PM   #331
Pentaxian
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 22,084
QuoteOriginally posted by weverka Quote
I want a teleconverter that turns an APS-C lens into full frame at the same time as it adds magnification.
This will, of course, be the opposite of a ‘booster’.
The same amount of light would be spread over more area, resulting effectively in a ‘larger’ {numerically} aperture than the lens is set for.

02-13-2022, 07:31 PM   #332
Junior Member




Join Date: Apr 2010
Location: Jersey Shore
Posts: 28
QuoteOriginally posted by reh321 Quote
The same amount of light would be spread over more area, resulting effectively in a ‘larger’ {numerically} aperture than the lens is set for.
But this happens whether or not the teleconverter is FF. And experience with the current offering says that the results are perfectly acceptable. The issue as I see it is how much more expensive would the glass be to make a FF teleconverter. If it existed, I would take it out with my 300mm prime lens and use it at 420mm for my bird photography. While the 150-450 gives 630 mm, it is so much heavier and often provides more zoom than I need (although there are times when it's the only choice due to the distance of a bird; but in those cases, it's rare to get a really useful photo other than for documenting a rare sighting).

Dave
02-15-2022, 09:03 AM - 3 Likes   #333
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jul 2021
Location: Zuiderkempen - Grote Netewoud - Belgium
Photos: Gallery | Albums
Posts: 543
QuoteOriginally posted by BarneyL Quote
I can't find info about how well this set focuses with such low effective aperture. Can anyone share?
Recently acquired the 150-450. Out of curiosity, I tried it with 1,4x TC and was amazed how swift both tc+lens focused, no hunting in low light, much better than with my old 55-300 f5.8 WR. Even in the current, grey winter weather..... pictures also quite decent, even in low light conditions of cloudy rainy days. I need time and good weather to investigate furter - lower iso than 3200 and shorter shutter time than 1/15 (handheld) should improve my first pictures- but it was above expectations and very promising.

On k3 II.
06-14-2022, 03:20 AM   #334
Moderator
Loyal Site Supporter




Join Date: Feb 2015
Location: Central Florida
Photos: Gallery
Posts: 4,909
Curious if anyone has personal experience with trying to pair the Pentax Rear Converter-A 1.4x-L and 150-450? I know it works well with the *200, but not the *300. I've seen no comment whatsoever on the DFA150-450

06-14-2022, 06:50 PM   #335
Junior Member




Join Date: Apr 2010
Location: Jersey Shore
Posts: 28
QuoteOriginally posted by gatorguy Quote
Curious if anyone has personal experience with trying to pair the Pentax Rear Converter-A 1.4x-L and 150-450? I know it works well with the *200, but not the *300. I've seen no comment whatsoever on the DFA150-450
I've used the combination with my K-1 II for years. Works well except for the vignetting, but most of the time I crop that out anyway. That's why I was so interested (earlier in this thread) in a FF teleconverter.

Dave
06-15-2022, 03:02 AM   #336
Moderator
Loyal Site Supporter




Join Date: Feb 2015
Location: Central Florida
Photos: Gallery
Posts: 4,909
QuoteOriginally posted by davesofnj Quote
I've used the combination with my K-1 II for years. Works well except for the vignetting, but most of the time I crop that out anyway. That's why I was so interested (earlier in this thread) in a FF teleconverter.

Dave
So performance is good? Probably pushing my luck to ask, but have you compared images with the far newer Pentax HD1.4?
06-15-2022, 07:49 PM   #337
Junior Member




Join Date: Apr 2010
Location: Jersey Shore
Posts: 28
QuoteOriginally posted by gatorguy Quote
So performance is good? Probably pushing my luck to ask, but have you compared images with the far newer Pentax HD1.4?
I didn't realize there'd been more than one version of the 1.4x. As far as I know, the HD 1.4x is the one I'm talking about. I recall paying close to $600 for it soon after it became available. It's under $400 these days.

The metric I used, albeit somewhat subjectively, was that if the same quality could be achieved by simply enlarging the image by 40% in Photoshop then there was no point in buying the teleconverter. It was clearly superior so I regarded it as a very good buy. In those days, I had a K-3, so the APS-C limitation wasn't a big deal. But then I got a K-1 and FF became desirable.

Dave

06-16-2022, 08:46 PM   #338
Site Supporter
Site Supporter




Join Date: Jun 2017
Photos: Gallery | Albums
Posts: 204
In the days of manual focus, there were the 1.4x-l and 1.4x-s as well as 2x-l and 2x-s. The L versions were for the F* 300 2.8 and F* 600 4. The front elemnets on the L stuck above the mount. This was done to decrease the distance from the rear element on the lens that was recessed and the converter lens. Joe
06-16-2022, 08:54 PM   #339
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jun 2021
Location: NE Ohio
Photos: Albums
Posts: 897
QuoteOriginally posted by joehenryd Quote
The L versions were for the F* 300 2.8 and F* 600 4.
They were usable with more lenses than just those two. From the database entry for the 1.4x-L TC:

Supported Lenses:
  • SMC Pentax-DA* 200mm F2.8
  • SMC Pentax-FA* 200mm F2.8
  • SMC Pentax-A* Macro 200mm F4
  • SMC Pentax-A* 300mm F2.8
  • SMC Pentax-FA* 300mm F2.8
  • SMC Pentax-A* 400mm F2.8
  • SMC Pentax-A 400mm F5.6
  • SMC Pentax 500mm F4.5
  • SMC Pentax-F* 600mm F4
  • SMC Pentax-FA* 600mm F4
  • SMC Pentax-A* 600mm F5.6
  • SMC Pentax 1000mm F8
  • SMC Pentax A* 1200mm F8
  • SMC Pentax 135-600mm F6.7
  • SMC Pentax F* 250-600mm F5.6
  • SMC Pentax FA* 250-600mm F5.6
  • SMC Pentax 400-600mm F8-12
They are manual focus only, and if used with an autofocus lens like an F, FA, or DA series lens, will make it work the same as an A series lens (manual focus only, no exif data or focal length communication).
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!
2x tc, adaptor, af, aw, converter, der, dfa, fa, ff, ff tc, flickr, frame, lens, lenses, macro, macros, pentax, pentax news, pentax rumors, people, ricoh, screwdrive, sigma, smc, tc, tc full frame, tcs, teleconverter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Full Frame Tamron 1.4X Pz-AF MC4 auto focus TC - (MIJ! THE quality budget choice) cheekygeek Sold Items 2 06-22-2017 10:00 AM
Some questions about buying sony full frame + adapters + pentax full frame lens jhlxxx Pentax Full Frame 8 06-14-2017 05:13 PM
From Full-Frame Sony... to Pentax... to Full-Frame Canon Mr_Canuck Canon, Nikon, Sony, and Other Camera Brands 42 01-21-2014 12:50 AM
Full frame or no full frame.... Deedee Pentax K-3 & K-3 II 14 10-08-2013 05:39 AM
Full Frame Full Frame vanchaz2002 Pentax DSLR Discussion 30 12-11-2008 07:09 AM



All times are GMT -7. The time now is 11:07 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