FAQ FAQ  Forum Search   Events   Register Register  Login Login

1.4x - Minolta APO II v Kenko DGX

Author
Phil Wood View Drop Down
Senior Member
Senior Member

Joined: 24 March 2013
Country: United Kingdom
Location: England
Status: Offline
Posts: 2305
Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Topic: 1.4x - Minolta APO II v Kenko DGX
    Posted: 05 May 2022 at 17:45
I have a Kenko 1.4x DGX converter (not Pro 300) and it works pretty well. However, I have recently become the proud owner of a couple of Minolta primes that are compatible with the APO II converters (200/2.8 HS APO & 300/4 HS APO) and am wondering if I will gain significantly better performance from a Minolta APO II teleconverter.

I also have a basic Kenko MC7 2x which I am less happy with and was considering an upgrade to the DGX version (based on my experience with the 1.4x).

The Kenko route is obviously very attractive - providing the results are up to scratch. I have plenty of lenses that are incompatible with the Minolta converters.
 



Back to Top
mambo View Drop Down
Senior Member
Senior Member

Joined: 13 September 2009
Country: Canada
Location: Winnipeg
Status: Offline
Posts: 1978
Post Options Post Options   Quote mambo Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2022 at 01:05
Having owned all the TCs you have described. I'd say the APO II is better than the Kenko offerings.
instagram | website | A6300 | A6400 | A7Riii | A7Riv | A99 |plus an assortment of glass |
Back to Top
robberly12 View Drop Down
Senior Member
Senior Member

Joined: 19 June 2012
Country: United States
Location: Pennsylvania
Status: Offline
Posts: 151
Post Options Post Options   Quote robberly12 Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2022 at 17:42
I have the Kenko DGX 1.4x, the Minolta APO 1.4x APO, and the Kenko Pro 300 2x converters. I agree that the DGX 1.4x works pretty well and fits nearly all my lenses. I use the APO 1.4x with my Minolta 400 f4.5 (High Speed), and it works quite well - fast focus and good image quality. I purposely got the original APO TC because a friend who had both said the APO actually focused faster because it didn't use the 2:1 gear reduction in the APO II. The gear reduction was apparently to prevent over-shooting focus on high-speed Minolta lenses, but that never seems to happen anyway. The DGX 1.4x on the Min 400 is slightly worse in image quality but focuses reasonably well. The only lens I have that the APO TC will fit (other than the 400) is my Sony 70-400 (manual focus only).

The Kenko Pro 300 2x is my least-used TC. The image quality is adequate with the Minolta 400, and it will auto-focus (but quite slowly). It's hard to get sharp shots with other lenses, and it doesn't fit any of my Sony/Minolta lenses (other than 70-400). It did fit all my Sigma and Tamron lenses I tried, but only the Tamron 70-200 (screw-drive) lens would auto-focus. It's a nice TC, and reports exif correctly, but it is just not really useful. I suspect the DGX 2x would fit more lenses, but probably would also not produce sharp photos most of the time. Your Minolta 200 and 300/HS lenses might produce useable results, though. Good luck if you spring for it.
Sony A580, A77/77ii, A99, 18-135, 70-400G, 500 Reflex, Minolta 28-135, 400/f4.5, Sigma 14/2.8, 105/180 Macros, Tamrons: 60 f2, 10-24, 28-75 F2.8, 70-200 F2.8, 16-300, 150-600
Back to Top
Mark Twain View Drop Down
Senior Member
Senior Member

Joined: 05 May 2013
Country: Austria
Status: Offline
Posts: 546
Post Options Post Options   Quote Mark Twain Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2022 at 19:02
Hi,

I have both used the Kenko DGX 1.4x and the Minolta APO 1.4x I (and the Minolta APO 2x II) on my Minolta 300/2.8 APO HS G.

The Kenko was worse in terms of image quality.

The 1.4x I has no gear reduction (as already mentioned) but I do not have focusing problems (on A900).

The 2.0x II slows down focusing a lot and stopping down to f/8.0 is required for satisfying image quality.

I've had the best experience with the Minolta 1.4x.
Back to Top
Phil Wood View Drop Down
Senior Member
Senior Member

Joined: 24 March 2013
Country: United Kingdom
Location: England
Status: Offline
Posts: 2305
Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2022 at 19:28
I have the 200/2.8 and 300/4 and have been offered a Minolta 2x APO II at a decent price, so I have gone for it. I'm a little concerned about AF with the 300, but I'm not so worried about AF speed.
Back to Top
robberly12 View Drop Down
Senior Member
Senior Member

Joined: 19 June 2012
Country: United States
Location: Pennsylvania
Status: Offline
Posts: 151
Post Options Post Options   Quote robberly12 Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2022 at 20:15
Phil -- You are wise to be concerned about getting AF on the Minolta 300/4 lens with the 2x APO TC. I think the teleconverter will cause the camera body to switch to MF, because you will effectively have a 600mm f8 lens. The Kenko 2x TC's would try to autofocus in this scenario, but not Minolta 2x. I don't have this combo, but that is my understanding. I guess you will find out!
Sony A580, A77/77ii, A99, 18-135, 70-400G, 500 Reflex, Minolta 28-135, 400/f4.5, Sigma 14/2.8, 105/180 Macros, Tamrons: 60 f2, 10-24, 28-75 F2.8, 70-200 F2.8, 16-300, 150-600
 



Back to Top
Phil Wood View Drop Down
Senior Member
Senior Member

Joined: 24 March 2013
Country: United Kingdom
Location: England
Status: Offline
Posts: 2305
Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2022 at 20:32
Originally posted by robberly12 robberly12 wrote:

I guess you will find out!


I have indeed found out.

As feared the 300/4 will not AF with the 2x APO II. It will, of course MF and I have to say the results are impressive.

With my 200/2.8 AF is sedate, it glides into focus rather than snaps - but, to be fair, so does the lens without the teleconverter. Most of the time AF it finds focus well and minor adjustments to, for instance, follow a moving bicycle, work well.

Although disappointed at the lack of AF with the 300/4 I am impressed by the optical quality, the combination with the 200/2.8 gives me a prime quality 400/5.6 which I am very happy with. This converter is in another class to my Kenko MC7 (I'd say 1st Class v 3rd).

Even though I only have the two compatible lenses I shall now be on the alert for a well priced 1.4x.

Edited by Phil Wood - 09 May 2022 at 21:09
Back to Top
Dyxum main page >  Forum Home > Equipment forums > Lens Talk > Adapters and converters

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.062 seconds.

Monitor calibration strip

Dyxum.com - Home of the alpha system photographer

In memory of Cameron Hill - brettania

Feel free to contact us if needed.