Author Topic: Teleconvertor  (Read 2426 times)

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Offline Morph

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Teleconvertor
« on: May 23, 2015, 01:05:30 PM »
Hello all , I have the 90mm Tamron Macro for the A77. There are times when I would like some more distance. I have had a look at 150 or 180mm Macro lenses but they are quite a price. I was considering a 2 x convertor. Ideally 3rd party as the Sony one are pretty expensive. Anybody have any experience or recommendations ?

Offline AScot

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Re: Teleconvertor
« Reply #1 on: May 23, 2015, 02:19:35 PM »
I would not recommend a 3rd party 2x TC for any lens. The cost in image quality is too high. The Sony/Minolta 2x TC's will only work on the white G lenses with an IQ penalty. The TC hits the rear optic of the other lenses. The Sony/Minolta 1.4x TC's are much better but again, for the same reasons as the 2x, will only work on the white G lenses. 3rd party 1.4x TC's I have no experience of, but from what I have read, some can be of use, but with reduced image quality depending on the lens. A Macro lens would not be a good choice for a TC as they need to be really sharp and even the best 1.4x TC may reduce the IQ/sharpness to an unacceptable level.
Sony A7, A850, A77, A700 || Sony>> 70-300G, 28-75 f2.8 SAM, 16-80CZ, 50 f1.4, FE 28-70 OSS, FE 24-70CZ f4 OSS, LA-EA4 || Minolta>> 300 f4 G HS, 200 f2.8 G HS, 100 f2.8 (D) Macro, 50 f1.7, 28 f2.8, 28-135 f4-4.5, 70-210 f4, 500 f8 Reflex, TC x 1.4 HS, TC x 2 HS. || Sigma 21-35 f3.5-4.2. || Tamron SP 24-135.

Offline Morph

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Re: Teleconvertor
« Reply #2 on: May 23, 2015, 03:06:01 PM »
Thank you for the detailed response and advice - these things are not always obvious when reading up on them.

Offline AScot

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Re: Teleconvertor
« Reply #3 on: May 23, 2015, 05:06:21 PM »
Thank you for the detailed response and advice - these things are not always obvious when reading up on them.

No, the sellers do not point out the downsides of anything. :(
Sony A7, A850, A77, A700 || Sony>> 70-300G, 28-75 f2.8 SAM, 16-80CZ, 50 f1.4, FE 28-70 OSS, FE 24-70CZ f4 OSS, LA-EA4 || Minolta>> 300 f4 G HS, 200 f2.8 G HS, 100 f2.8 (D) Macro, 50 f1.7, 28 f2.8, 28-135 f4-4.5, 70-210 f4, 500 f8 Reflex, TC x 1.4 HS, TC x 2 HS. || Sigma 21-35 f3.5-4.2. || Tamron SP 24-135.

Offline Frank [aka Wires]

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Re: Teleconvertor
« Reply #4 on: May 23, 2015, 07:10:37 PM »
Hello Morph

If you do not mind shooting in jpg only you could try the inbuilt 2x convertor in the a77. It would give you an idea of the quality - loss or otherwise - and give you an idea of what a 180mm would give and to see if it would warrant the expenditure.

I was under the impression that the 90mm Tamron is a full frame lens and equates to 135mm on the a77 and other apsc cameras. If this is correct then the inbuilt 2x would put it to 270mm equivalent.

I have used the inbuilt 2x on an a700 and a77 using the 70-400G and was not too disappointed with the end result.
Frank (aka Wires)
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Offline chappo1

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Re: Teleconvertor
« Reply #5 on: May 24, 2015, 12:08:48 AM »
The Tamron 90 and the 180 (which I have) are full frame lenses.  I have a Kenko 1.4 which I have used (sparingly) on my Sigma 50-500mm and my 70-300G.  I bought it to make the 50-500mm a 700mm to get larger Scarlett Robin shots in the wild.

You have to try these things for yourself and if you were local you could borrow mine for a while.
My conclusion for ME is that I gain nothing over simply cropping and blowing up the 24Meg A99 image in photoshop.
The loss in quality, loss of auto focus, and the stop loss in light caused more problems than the gain in length solved.
In other circumstances where you are on a tripod and the subject is not too flighty, you may gain....john
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