Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-06-2014, 10:09 AM   #1
Veteran Member
zantaphia's Avatar

Join Date: Mar 2011
Location: Klippan, Scania
Photos: Gallery | Albums
Posts: 509
HD-DA 1.4x Rear Converter AW+ (D)FA 100/2.8 = FA200/4?

Hi!

I was looking at the exif after I've shot some photos with my K-3 and HD-DA 1.4x Rear Converter AW+ FA 100/2.8 Macro. It was reported as: "on 35 mm: 210mm/f4.
I know there is differences in the DoF (APS to FF), but what's your opinion? Could this (APS) combo replicate the mythical FA200/4 Macro, image quality wise?
Or is it impossible to compare the 2 different setups?

04-06-2014, 10:42 AM   #2
Site Supporter
Site Supporter
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,807
But isn't it 140mm not 200mm?
04-06-2014, 11:28 AM   #3
Veteran Member




Join Date: Jun 2013
Location: Sunny Dun(ny)fermline, Fife
Posts: 405
Yes but it's 100mm x1.4 (for the teleconverter) then x1.5 (for aps)

---------- Post added 04-06-14 at 07:30 PM ----------

Ah I see what you mean, the FA200mm is the focal length prior to the aps factor calculation
04-06-2014, 11:44 AM   #4
Site Supporter
Site Supporter




Join Date: Nov 2006
Location: Norway
Photos: Gallery | Albums
Posts: 574
QuoteOriginally posted by Johndav Quote
Yes but it's 100mm x1.4 (for the teleconverter) then x1.5 (for aps)

---------- Post added 04-06-14 at 07:30 PM ----------

Ah I see what you mean, the FA200mm is the focal length prior to the aps factor calculation
Forget factor multiplications. It's of no use at all. Really.

04-06-2014, 09:13 PM   #5
Veteran Member
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,761
I think the OP expressed correctly. And the combo would in did have the same field of view (5% narrower) and shutter speed at equal aperture and ISO but large DoF compared to 135 format with FA200/4.

Could you post some samples with and without the 1.4x converter shot wide open without applying lens corrections to see what happens with aberrations. I think contrast and sharpness should be comparable between DFA100WR and FA200 wide open.
04-06-2014, 10:31 PM   #6
Site Supporter
Site Supporter




Join Date: Nov 2006
Location: Norway
Photos: Gallery | Albums
Posts: 574
QuoteOriginally posted by carrrlangas Quote
I think contrast and sharpness should be comparable between DFA100WR and FA200 wide open.
DFA100 is not even on the same field as FA*200/4 and a converter will not change that.
04-06-2014, 10:55 PM   #7
Veteran Member
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,761
QuoteOriginally posted by StigVidar Quote
DFA100 is not even on the same field as FA*200/4 and a converter will not change that.
I wouldnŽt know. I do not own any of those lenses. But the DFA100WR has newer coatings and is optimized to be used on digital sensors and that is always and advantage. And if the converter is as good as IŽve read so far, I think the combo stands a chance. WeŽd need someone with both lenses and the adapter to know for sure..

04-06-2014, 11:41 PM   #8
Site Supporter
Site Supporter




Join Date: Nov 2006
Location: Norway
Photos: Gallery | Albums
Posts: 574
QuoteOriginally posted by carrrlangas Quote
WeŽd need someone with both lenses and the adapter to know for sure..
StigVidar - View Profile - PentaxForums.com
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!
1.4x, 1.4x rear converter, aps, converter, converter aw (d)fa, hd-da, hd-da 1.4x, k-mount, macro, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stacking HD-DA 1.4x Rear Converter AW quarc Pentax SLR Lens Discussion 18 12-13-2015 11:44 PM
Pentax HD 1.4 Rear Converter Mr. Ed Pentax SLR Lens Discussion 3 04-26-2014 07:14 AM
HD Pentax-DA 1.4x AW AF Rear Converter v.s Kenko Pz-AF 1.5X Teleplus SHQ Tjompen1968 Pentax SLR Lens Discussion 19 04-03-2014 02:52 AM



All times are GMT -7. The time now is 01:40 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