Author Topic: 2x Teleconverter  (Read 11246 times)

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Offline Gbags

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2x Teleconverter
« on: July 01, 2008, 08:03:54 PM »
Hi, I have just joined this forum and would like some advice from the more experienced amongst you on the above subject, I am thinking of purchasing one of these for my 5D and was wondering which one to buy, are there any that are better than others and which one's should I look out for, and which one's should I avoid.
Hope to hear of you soon.
Many Thank's
Graham
A 700,Dynax 5d, 100-300mm 1:4.5-5.6, 70-210mm 1:4.5-5.6, 35-70mm 1:3.5-4.5, 35-70mm 1:4, 70-210mm 1:4, 28-85 1:3.5-4.5 Macro. Minolta 50mm 1:1.7. www.flickr.com/photos/gbags/

Offline Asher

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Re: 2x Teleconverter
« Reply #1 on: July 01, 2008, 08:13:20 PM »
Hi Graham,

Which lens do you intend to use the teleconverter with?

Asher

Offline Gbags

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Re: 2x Teleconverter
« Reply #2 on: July 01, 2008, 08:18:31 PM »
I have various len's I would like to use it with, the minolta28-85mm f3.5-4.5 also the 70-210 mm F4 (Beercan) and Minolta 100-300mm f4.5-5.6
A 700,Dynax 5d, 100-300mm 1:4.5-5.6, 70-210mm 1:4.5-5.6, 35-70mm 1:3.5-4.5, 35-70mm 1:4, 70-210mm 1:4, 28-85 1:3.5-4.5 Macro. Minolta 50mm 1:1.7. www.flickr.com/photos/gbags/

Offline Stef.

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Re: 2x Teleconverter
« Reply #3 on: July 01, 2008, 08:19:03 PM »
Graham- should I have not said it before- welcome to the forum.
Perhaps check out the following link:
http://www.dyxum.com/lenses/TC/index.asp

This should perhaps answer most of your possible questions?
Hope it helps?
Stef.
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Offline Gbags

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Re: 2x Teleconverter
« Reply #4 on: July 01, 2008, 08:22:25 PM »
Thank's for the welcome Stef, I will have alook at the web site you have mentioned, also I like to have views from the people that have used these converters.

Graham.
A 700,Dynax 5d, 100-300mm 1:4.5-5.6, 70-210mm 1:4.5-5.6, 35-70mm 1:3.5-4.5, 35-70mm 1:4, 70-210mm 1:4, 28-85 1:3.5-4.5 Macro. Minolta 50mm 1:1.7. www.flickr.com/photos/gbags/

Offline Asher

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Re: 2x Teleconverter
« Reply #5 on: July 01, 2008, 10:28:34 PM »
You lose 2 f-stops with a 2x teleconverter.  I'm pretty sure you need f5.6 for the autofocus to work.  Either way you might be better off with a 1.4x or 1.5x teleconverter.

Offline fother

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Re: 2x Teleconverter
« Reply #6 on: July 02, 2008, 12:08:49 AM »
Welcome to the forum Gbags!

Short answer - with a beercan, nothing. Teleconverters on beercans are a waste of time and money.

On the other lenses, any generic brand TC is fine - don't get the minolta/sony APO ones, they're not compatible with those lenses.

The Kenko Pro 300 line is good & reliable, that'd be my recommendation

Offline Dr.Theo

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Re: 2x Teleconverter
« Reply #7 on: July 02, 2008, 04:09:51 AM »
and on top of that i will have a brand new set of kenko teleplus 300 converters up for sale shortly
The first step is admitting you have a problem.
A700/7d/A100 sony 50/1.4|70-200 ssm|70-300G|CZ 16-80|Min 17-35G|
28-70G|28/2|35/2|85/1.4GD|100/2|100/2.8D|135/2.8|200/2.8HSG|300/2.8G|Sigma 10-20

Offline fother

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Re: 2x Teleconverter
« Reply #8 on: July 02, 2008, 04:10:46 AM »

ooh, 1.4x, 2x, or 3x (or all of them?) :)

Offline Fud

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Re: 2x Teleconverter
« Reply #9 on: July 02, 2008, 08:05:01 AM »
Might be interested in the 3x as I already have the 1.4x and 2x :)

Question I'd ask is why?
A900+VG, A77+VG, Minolta 17-35G,  Sony CZ24-70 F2.8,Sony 70-200 F2.8 SSM, Sony 70-400 SSM, Sony 135STF,85 F1.4, 200 F4 Macro, 600 F4 HS APO

Offline Dr.Theo

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Re: 2x Teleconverter
« Reply #10 on: July 02, 2008, 08:23:02 AM »
well.... at this stage of the game, my lens collection has out done anything i ever possibly imagined it doing, so the only converters of any real use to me are the sony / minolta APO converters as the lenses i would use them on, will only fit those converters. and i dont need them on my non APO / G lenses (mostly primes that are wide angle, and a couple of short tele primes that i would not use them on, i would just use a different lens) the real intest to me in T/C's are for the 70-200 ssm, the 200 g hs. and the 300 2.8, and i already have a 2x now i just need a 1.4,

if some one wanted to swap for a nice 1.4 i would do that.

and it is just the 2x and 1.4 x
The first step is admitting you have a problem.
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28-70G|28/2|35/2|85/1.4GD|100/2|100/2.8D|135/2.8|200/2.8HSG|300/2.8G|Sigma 10-20

Offline Gbags

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Re: 2x Teleconverter
« Reply #11 on: July 02, 2008, 01:52:37 PM »
I could be interested in either the 1.4x or the 2x. please send PM when available.

Thank's for all your replies they have been very helpful.

Graham
A 700,Dynax 5d, 100-300mm 1:4.5-5.6, 70-210mm 1:4.5-5.6, 35-70mm 1:3.5-4.5, 35-70mm 1:4, 70-210mm 1:4, 28-85 1:3.5-4.5 Macro. Minolta 50mm 1:1.7. www.flickr.com/photos/gbags/

Offline Stef.

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Re: 2x Teleconverter
« Reply #12 on: July 03, 2008, 12:29:04 PM »
Graham- just as a last note (not kowing which lenses you intend to use with your converter(s): any converter will degrade to some extent image quality. It will at most times be better to use a 100mm lens for instance than a 50mm with 2x converter. I have doen a test at the long end of the Sony70200G and the Sigma 100300 and the usually fantastic Sony lens with tc was beaten by the Sigma at the 300mm end.
So for me a tc has only two functions: either I haven't got that lens range yet and can't afford a longer lens or I want to travel light knowing that the tc is just for emergency purpose as I don't intend to shoot at the longer end.
Good luck with your decision
Stef. :P
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Re: 2x Teleconverter
« Reply #13 on: July 03, 2008, 08:25:03 PM »
Man, Stef.   you hit the proverbial nail right on the head.

There are darn few lenses I would consider "extending" with a T/C.  Your IQ (Image Quality) just suffers to the point of utter frustration, especially on the wide apertures.

The purchase of a TAMRON SP AF 200-500 f/5-6.3 Di LD really does solve the long stuff.  The lens is very sharp and weighs a mere 43 ounces.  A 2x T/C mounted on the superior SONY 70-200 f/2.8 G SSM cannot even touch the IQ from this longer "true" zoom lens ... and the TAMRON is a mere $800.

Obviously, there are those who may argue ... but, I've shot enough side-by-sides with these two lenses to offer some insight on the results.

For better photography, avoid T/Cs, when you can.

Offline Fud

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Re: 2x Teleconverter
« Reply #14 on: July 04, 2008, 09:46:06 AM »
I have the kenko 1.4x and 2x convertors.  The 1.4x shows practically no degridation whilst there is some softening with the 2x.  However as I generally only use them with the Tokina 300mm f2.8 they are extending the range where I don't have a lens and I therefore accept a slight softening at 600mm F5.6.  The 1.4x gives me a very sharp 420mm F4 a lot cheaper than buying the 400 F4.5 with images that I think would probably compare :).  I think this is the area where the teleconvertors are worth the money.
A900+VG, A77+VG, Minolta 17-35G,  Sony CZ24-70 F2.8,Sony 70-200 F2.8 SSM, Sony 70-400 SSM, Sony 135STF,85 F1.4, 200 F4 Macro, 600 F4 HS APO