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Teleconverters ARE relevant on A99ii, A77ii etc

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WestCoastCannuck View Drop Down
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Post Options Post Options   Quote WestCoastCannuck Quote  Post ReplyReply Direct Link To This Post Topic: Teleconverters ARE relevant on A99ii, A77ii etc
    Posted: 20 May 2017 at 01:54
Edit: I just saw I had camera on APSc mode.

For the purposes of this test it will not make any difference (still the same camera pixels! just the center area!) But, I will add new FF pics as soon as i can.... but my 2 year old just woke up. probably have to wait till tomorrow.

In my mind its settled.    

Please add your own samples to this thread if you wish. I found the other thread so negative that I felt a direct "challenge" topic was necessary. Mods can decide otherwise if they feel it necessary.

As others have said... all combinations of Camera, TC and lens will produce different results. Some effective, some apparently not.

I could not print anything with near enough resolution for this test. I just found the finest label printing I could. The little instructions in a bottle of baby cough syrup.

All shots on A99ii. Straight out of the camera extra fine jpgs. Shot at a distance of 34 ft on a tripod. SS off. Wired release. ISO 50. All shot wide open... a little stopping down would of course increase resolution a bit but for this test it was not necessary.

I took multiple shots of each combination fine tuning focus manually. For each shot.. I had other equally sharp shots. I got them all as good as can be.

Lenses used: Minolta AF300mm F2.8 HS G and Minolta AF400mm F4.5 HS G. Teleconverters: Minolta APOii 1.4X and 2X. (only added the 2X on the 400 sorry)

Here is a link that has all the shots. One click at the top right will download all the full resolution jpgs. Exif info at bottom right of each pic. The (i) button.

Happy pixel peeping!   


Pics HERE--> A99ii 1.4X and 2X Teleconverter examples

Edit 2: Fixed pic names labels. Had the 300 and 300+TC reversed.

edits: clarity and label mistakes

Edited by WestCoastCannuck - 20 May 2017 at 08:41
flickr

A99ii|A77ii|Tam15-30|ZA24-70|M28-135|M35-105|M80-200G|SAL70400G|Σ50 1.4|ZA135|200F2.8HS G|300F2.8HS G|400/4.5|APOii1.4XTC|APOii2XTC
 



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josephwilliam View Drop Down
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Post Options Post Options   Quote josephwilliam Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2019 at 19:59
How is AF performing with 2x teleconverter on 400/4.5? Does it work at all?
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WestCoastCannuck View Drop Down
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Post Options Post Options   Quote WestCoastCannuck Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2019 at 20:26
Originally posted by josephwilliam josephwilliam wrote:

How is AF performing with 2x teleconverter on 400/4.5? Does it work at all?


With Sony or Minolta TC's AF does not work for the 2X + 400/4.5 combination. I still used that combination quite a lot for moon shots, and even the odd manual focus shot. I understand AF will work with the 2X kenkos... though not very well.

AF works on my 300/2.8 with the 2X minolta. Though slow.
flickr

A99ii|A77ii|Tam15-30|ZA24-70|M28-135|M35-105|M80-200G|SAL70400G|Σ50 1.4|ZA135|200F2.8HS G|300F2.8HS G|400/4.5|APOii1.4XTC|APOii2XTC
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2019 at 23:54
Originally posted by WestCoastCannuck WestCoastCannuck wrote:

I found the other thread so negative that I felt a direct "challenge" topic was necessary.

I don't know what other thread you're talking about, but those of us who have done extensive teleconverter testing are not negative about them. We're just realistic. The reality is that some combinations of lens, TC, and camera are capable of producing better results than cropping and resampling, so a TC can be useful in those cases; while other combinations of lens, TC, and camera are not capable of that at all, so a TC would be a waste of time and money in those cases.
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WestCoastCannuck View Drop Down
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Post Options Post Options   Quote WestCoastCannuck Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 00:07
Originally posted by sybersitizen sybersitizen wrote:


I don't know what other thread you're talking about.......- snip -


Given I made this post 2 years ago, I don't know what other thread I am talking about either. ;)   
flickr

A99ii|A77ii|Tam15-30|ZA24-70|M28-135|M35-105|M80-200G|SAL70400G|Σ50 1.4|ZA135|200F2.8HS G|300F2.8HS G|400/4.5|APOii1.4XTC|APOii2XTC
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 13:26
Anyone tried a TC on E-mount?
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 14:09
Originally posted by Miranda F Miranda F wrote:

Anyone tried a TC on E-mount?

The A-mount Kenko TC's work fine on the LA-EA adapters. Contrast detect AF with the LA-EA1/3 works at any effective aperture. On sensor phase-detect on my A7II is limited to f/8. The LA-EA4 acts just like an SLT.

Edited by QuietOC - 08 May 2019 at 14:13
Sony A7III A77II A6000 HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II MD-NEX KR-NEX DA-NEX
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9 AF-P/Q
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momech View Drop Down
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 18:49
I've got Minolta/Sony last generation A mount TCs, and a Minolta 2X TC II. These are limited to below F8, of course.
Main problem I encounter is using my old 600/4 APO - the non-G version - with my A77 or A99 II. Even the 1.4 TCs tend to microhunt. Also happens to a lesser extent with my 300/2.8 APO and my 400/4.5 HS. IQ suffers a good bit as well.
Best way to solve this is to have plenty of light, but early AM or evening shots can be a real challenge, if not impossible.
It's never too late to have a happy childhood.
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Post Options Post Options   Quote C_N_RED_AGAIN Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 19:07
Originally posted by Miranda F Miranda F wrote:

Anyone tried a TC on E-mount?


Teleconverters work great on e mount. I donít notice any quality reduction or af speed with the 100-400. Actually my 1.4 tc never leaves my 100-400. With all the latest e mount cams af can happen with teleconverters till f11 with a9 f16
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 19:22
It seems to me that lens aberrations cause AF issues. SLR AF sensors are image sensors just one dimensional. They need contrast along that dimension and work best with more contrast. There's a good thread somewhere by Marianne Orlund exlaining how SLR AF sensors work. I'll add a link when I find it.

SLR AF sensors have an effective apertures. They don't see the wide-open image from faster lenses. But when you use a teleconverter the AF line sensors now see more of the aberrations plus those are now magnified 1.4X plus whatever aberrations added by the TC.



Edited by QuietOC - 08 May 2019 at 20:20
Sony A7III A77II A6000 HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II MD-NEX KR-NEX DA-NEX
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9 AF-P/Q
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amrep View Drop Down
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 20:27
Marianne Oelund: Autofocus System Design
https://www.dpreview.com/forums/thread/3713509
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2019 at 08:53
Thanks for the link, guys. I'll read that when I have time.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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