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A-Mount Teleconverters Guide

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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2021 at 18:43
Originally posted by PAUMART PAUMART wrote:

Originally posted by QuietOC QuietOC wrote:


The Tele Plus DGX models will work with AF motors in lenses (SSM, SAM, USD, HSM, etc.) The DG models don't have chips which generally means AF doesn't work with them. The earlier Tele Plus models may or may not have chips. The chipped ones generally work well with screw-driven lenses.


As it seemed to me to understand in the thread, the models without a chip do work with AF, what they do not provide is the correct EXIF ​​information because they interpret that the TC is the same lens. That is, the camera does not identify that it has a CT and although the AF can be lazier, it usually works up to exceeding F8 or F11.

The ones without chips do not work well with AF. The 1.4X/1.5X ones allow some poor AF that can sort of work, but it doesn't work well really. I would not recommend them. The chipped versions allow better AF.

AF works less well the smaller the relative aperture. F6.7 is already pretty poor. F11 requires extraordinary contrast/brightness.

I don't find that "Pro 300" means anything based on those I've had. Probably just marketing by Kenko.

Edited by QuietOC - 13 August 2021 at 18:51
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Post Options Post Options   Quote PAUMART Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2021 at 18:49
Originally posted by amrep amrep wrote:

You may go for the cheapest option of these (the MC7).
On A58 there is no benefit from a Pro 300.

It's what I thought. The only thing that makes me doubt is what is said in the thread that the 300 PRO is optimized for Tamron SP optics that have a faster focus. Something like the Minolta APO HS, but I think I will opt for the MC7 because I think that it is with the others that Kenkop came into conflict with Sony, perhaps, due to its inadequate adaptation.
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2021 at 19:36
Originally posted by QuietOC QuietOC wrote:

I don't find that "Pro 300" means anything based on those I've had. Probably just marketing by Kenko.
Pro 300 have different optics that "catches" a wider light cone (wider front element) than the similar "non pro 300." It's not just marketing.
Originally posted by PAUMART PAUMART wrote:

The only thing that makes me doubt is what is said in the thread that the 300 PRO is optimized for Tamron SP optics that have a faster focus.
This is not true. There are a range of very different Tamron SP lenses (SP means SuperPerformance = marketing!).
The Pro 300 converters are optimized for 300mm 2.8 (and longer similar fast lenses), no matter what brand. The Pro 300 has NO specific connection to Tamron SP i general.

Pro 300 is for A900/A850 or A99/A99ii with a fast supertele lens.
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Post Options Post Options   Quote PAUMART Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2021 at 19:57
Originally posted by amrep amrep wrote:

Originally posted by QuietOC QuietOC wrote:

I don't find that "Pro 300" means anything based on those I've had. Probably just marketing by Kenko.
Pro 300 have different optics that "catches" a wider light cone (wider front element) than the similar "non pro 300." It's not just marketing.
Originally posted by PAUMART PAUMART wrote:

The only thing that makes me doubt is what is said in the thread that the 300 PRO is optimized for Tamron SP optics that have a faster focus.
This is not true. There are a range of very different Tamron SP lenses (SP means SuperPerformance = marketing!).
The Pro 300 converters are optimized for 300mm 2.8 (and longer similar fast lenses), no matter what brand. The Pro 300 has NO specific connection to Tamron SP i general.

Pro 300 is for A900/A850 or A99/A99ii with a fast supertele lens.

Thank you very much, it makes it quite clear for me.
I understand that the 300 PRO does not give me much in a combination of A58 with a Tamron SP 70-300, compared to the MC7 and that it may even work worse.
For the rest, the prices at which I can find them are almost the same.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2021 at 20:27
Every teleconverter (and focal reducer) I've used has worked better with longer focal lengths.

Kenko is currently marketing "HDpro" TELEPLUS models. Someone should have told them that HD is really out-of-date. UHD 8K is current marketing.
Sony A7RIV NEX-5T HVL-F45RM LA-EA5 Metabones-IV Sigma MC-11 Yongnuo EF-E II TLT ROKR 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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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2021 at 21:16
Originally posted by QuietOC QuietOC wrote:

Kenko is currently marketing "HDpro" TELEPLUS models. Someone should have told them that HD is really out-of-date. UHD 8K is current marketing.
Kenko and Pentax
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2021 at 12:14
Originally posted by PAUMART PAUMART wrote:

Originally posted by amrep amrep wrote:

Originally posted by QuietOC QuietOC wrote:

I don't find that "Pro 300" means anything based on those I've had. Probably just marketing by Kenko.
Pro 300 have different optics that "catches" a wider light cone (wider front element) than the similar "non pro 300." It's not just marketing.
Originally posted by PAUMART PAUMART wrote:

The only thing that makes me doubt is what is said in the thread that the 300 PRO is optimized for Tamron SP optics that have a faster focus.
This is not true. There are a range of very different Tamron SP lenses (SP means SuperPerformance = marketing!).
The Pro 300 converters are optimized for 300mm 2.8 (and longer similar fast lenses), no matter what brand. The Pro 300 has NO specific connection to Tamron SP i general.

Pro 300 is for A900/A850 or A99/A99ii with a fast supertele lens.

Thank you very much, it makes it quite clear for me.
I understand that the 300 PRO does not give me much in a combination of A58 with a Tamron SP 70-300, compared to the MC7 and that it may even work worse.
For the rest, the prices at which I can find them are almost the same.


I know your after a 2x teleconverter , but just as a warning regards tele-converters in general .

I have a Kenko teleplus 300 1.4x TC ( do they do a 2x version ?)and it has a slightly protruding front element .
This prevents most lenses being mounted on it .
It's matched for long , fast lenses , such as my 200mm f/2.8 and 300mm f/4 .
IIRC , non of my zoom lenses fit on it .
I bought it to use with those lenses when mounted on an E mount body via the LA-EA2/4 , where it works fine whilst the Minolta TC's are disabled .

Edited by neilt3 - 14 August 2021 at 12:17
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Post Options Post Options   Quote robberly12 Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2021 at 01:30
Originally posted by neilt3 neilt3 wrote:


I know your after a 2x teleconverter , but just as a warning regards tele-converters in general .

I have a Kenko teleplus 300 1.4x TC ( do they do a 2x version ?)and it has a slightly protruding front element .
This prevents most lenses being mounted on it .


This is a very apt statement by neilt3. I have a Kenko Teleplux Pro 300 2x TC, and it does not physically fit most of my Sony and Minolta lenses. (I have more than those listed in my signature.) The only Sony/Minolta lenses it fit for me are the Sony 70-400G1 and Minolta 400 f4.5. It does fit all the Sigma and Tamron lenses I've tried, including zooms, but the quality is not the best. In fact, the only lens I have where I'd say it is worth using is with the Minolta 400. It will autofocus with that lens, but it is slow and requires the use of the "wide" AF area. I also have a Minolta APO 1.4x TC which works very well the the Minolta 400, but fits very few other lenses.

I have found my Kenko DGX 1.4x TC to be a generally much more useful TC. It is more recessed than the 300 Pro 2x, so it physically fits all my lenses except the Sony 18-135. The Sony 35 f1.8(DT) also didn't work because it locked up. It will attempt to autofocus with almost all my lenses, but the focus can be slow or inaccurate with slower lenses. Image quality is not stellar, but it is still better the 2X Pro 300 TC at equivalent focal lengths. I think the optics of the Pro 300 2x TC are probably quite good, but any 2x TC will suffer in performance, especially with slow, zoom lenses.

All three of my TCs are chipped so there's no difference in that aspect. Good luck, PAULMART, with your search for a good teleconverter. Hope this helps.
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
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Post Options Post Options   Quote PAUMART Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2021 at 10:33
Originally posted by neilt3 neilt3 wrote:

Originally posted by PAUMART PAUMART wrote:

Originally posted by amrep amrep wrote:

Originally posted by QuietOC QuietOC wrote:

I don't find that "Pro 300" means anything based on those I've had. Probably just marketing by Kenko.
Pro 300 have different optics that "catches" a wider light cone (wider front element) than the similar "non pro 300." It's not just marketing.
Originally posted by PAUMART PAUMART wrote:

The only thing that makes me doubt is what is said in the thread that the 300 PRO is optimized for Tamron SP optics that have a faster focus.
This is not true. There are a range of very different Tamron SP lenses (SP means SuperPerformance = marketing!).
The Pro 300 converters are optimized for 300mm 2.8 (and longer similar fast lenses), no matter what brand. The Pro 300 has NO specific connection to Tamron SP i general.

Pro 300 is for A900/A850 or A99/A99ii with a fast supertele lens.

Thank you very much, it makes it quite clear for me.
I understand that the 300 PRO does not give me much in a combination of A58 with a Tamron SP 70-300, compared to the MC7 and that it may even work worse.
For the rest, the prices at which I can find them are almost the same.


I know your after a 2x teleconverter , but just as a warning regards tele-converters in general .

I have a Kenko teleplus 300 1.4x TC ( do they do a 2x version ?)and it has a slightly protruding front element .
This prevents most lenses being mounted on it .
It's matched for long , fast lenses , such as my 200mm f/2.8 and 300mm f/4 .
IIRC , non of my zoom lenses fit on it .
I bought it to use with those lenses when mounted on an E mount body via the LA-EA2/4 , where it works fine whilst the Minolta TC's are disabled .


Well, I have seen that there is a great variety of Kenko CTs in all their ranges. Some say they are for Minolta and other Sony Minolta. If they are for minolta, I think they can give adaptation problems because they stand out.
IN particular, I have ordered an MC7 teleplus 2x and I have made sure that it is the model that is marked with the Greek letter alpha. They are the only ones that I have seen like this and that I imagine are absolutely specific to the Sony alpha range.
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Post Options Post Options   Quote PAUMART Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2021 at 10:45
I have finally acquired a Kenko TELEPLUS MC7 2x. It is the one that is specifically marked with the Greek alpha letter that characterizes the Sony alpha series.
I have assumed that a duplicator will make me lose sharpness and even AF on many occasions, requiring manual focus. Also, if the AF works, it will be slower.
But my purpose is not to take photos of birds in flight with the duplicator, I can do this perfectly with focal lengths between 70 and 300 or less (seagulls, corporanes, flamingos, ibis, vultures, eagles, etc.) but to take them in static when they are in the wetlands at a greater distance, for example, lunar photography, distant points in landscapes and not easily accessible, etc. Also see how it affects the macro, IN short, I will experiment with it.
As I say, for moving, even sports photography, the proximity of the subjects I hunt is rarely not covered by a focal range of 200 or 300.
When I get back in a few days and do the tests, I will tell you how it works.
What I have clear is that to play, experiment and as an amateur, I cannot afford to buy a telephoto lens with a great focal length and quality and this can bring me a bit closer to what I am looking for.
On the other hand, I like and control the post processing very well and many problems of chromatic aberrations, distortions, vignetting and even focus I correct them in this part of the process.
I just hope I enjoy it.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2021 at 11:50
FYI - the greek letter alpha was the main Minolta brand for A-mount cameras since the beginning. You may not be aware of that since they used Maxxum and Dynax in some export markets. Sony bought the Alpha brand from Konica-Minolta.
Sony A7RIV NEX-5T HVL-F45RM LA-EA5 Metabones-IV Sigma MC-11 Yongnuo EF-E II TLT ROKR 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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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 31 August 2021 at 14:04
Originally posted by addy landzaat addy landzaat wrote:

Originally posted by neilt3 neilt3 wrote:

I haven't got a translator on my phone , so I can't understand the question .
It is 2021, Neil


Hey , it might have taken more than two weeks , but I've just found out my phone does have a translator thingy on it after all !
I've only had the phone for about two years .
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2021 at 14:34
Have fun with your TC, Paumart. Hope it gets you some great bird pics.
FWIW the tests I did on my A58 with charts in the garden showed no increase in resolution on 300mm+ FL lenses with a 2x TC over a 1.4x TC and 1.4x digital zoom/crop, but to be fair I never tested an f2.8 300mm so that may be different.

The only benefit I can see for a 2x TC on an A58 or A77ii is that the AF has a bigger target to lock onto (assuming it still works at the effective aperture ...) With 20MP+ APS-C sensors the resolution of the sensor is often pretty close to that of the lens, which limits the benefits, and the EVF helps you see what you're targeting too so the TC isn;t needed to magnify the VF image.

Having said that I've got some good moon pics with a 2x TC, though the Minolta 500mm reflex (with no TC) is as good. I will have to try that on the A7ii, with and without a TC.

Miranda F & Sensorex, Sony A7Rii, 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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