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Teleconverter, Is it worth?
Topic Started: Apr 21 2008, 09:43 PM (860 Views)
RiRi
Alpha Elite Member
2x Teleconverter

Whats it actually for?
And how good is it ?
Worth the buy?

I'm planning to get a Sony 50mm/f1.4 as my next lens
(Can't afford the 85mm/f2 or 2.x can't rmb :x)

Wondering if i should get the teleconverter as a keep item or not

Anyone got views after using it?
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Trigger Happy
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Alpha Jedi Member
which 2x tc are you looking to get? the newer sony one is not for keeps, its new and not rare. the older minolta ones (APO and APO II) would be rarer but there are some that are designed to work with different lenses.

2x TCs in general multiply your focal length by 2. so a 50mm lens would yield 100mm (ignoring the digital sensor crop factor). but before you think you can turn your 500mm lens into a cheap 1000mm one, the 2x TC also reduces light by 2 stops. so a f/1.4 lens would become f/2.8 (no way you can override this).

and... the maximum aperture is f/4, if your lens' largest aperture is f/5.6 then you lose AF altogether. btw, AF speed is reduced with a TC, whether 1.4x or 2x.

in the case of a 500mm f/8 mirror lens, you'll be shooting 1000mm f/16 in full manual focus, so better pray for a very bright day.
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Many are culled, few are chosen
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Birder
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Alpha Master Jedi Mita Memori-san ’¹‚Ì’j clkoh

Hi RiRi

Teleconverter (TC) is meant for Tele lens..

So people only use when have no choice but need the extra reach their tele lens cannot give.. Avoid using if can.

Reason 1:
TC adds 1 stop for 1.3x, 1.4x or 1.5x TC
TC adds 2 stops for 2X
TC adds 3 stops for 3X

Reason 2:
Picture degradation is obvious, much so for 3rd party TCs.
TC magnifies the quality of lens

Good lens + TC = ok picture
Good lens + Good TC = Good picture
Lousy Lens + Lousy TC = VERY lousy picture
Lousy lens + Good TC = not possible (cannot fit)

Reason 3 (yeah like what TH said):
Roughly...
F2.8 lens + 1.4x = OK AF
F2.8 lens + 2x = Slow AF
F4 lens + 1.4X = Slow AF
F4 lens + 2X = MF (Manual Focus)
> F4 lens + 1.4X = MF (Manual Focus)
>F4 lens + 2X = MF (Manual Focus)

You need good lens after all..

Reason 4:
Good TC = Sony/Minolta TC = expensive
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Ming
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90609866
Looks like you are going to repeat more ... :sweat:

RiRi , like to have a read at THIS first ? :)
Ask ... Absorb ... Equip ... Execute
N E X with M I N G HERE ! A P - Ming HERE ! Macro-Ming HERE ! Pano-Ming HERE ! Food ! Food ! Foods ! HERE
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Ming
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90609866
RiRi
Apr 21 2008, 09:43 PM
I'm planning to get a Sony 50mm/f1.4 as my next lens
(Can't afford the 85mm/f2 or 2.x can't rmb :x)

RiRi , this 50mm f1.4 itself is a very good lens to use . But by adding a 2X TC to make it 100mm f2.8 ... :sweat: I have thought of this & had personally tried it . Its not going to make it as what you think of the 85mm f1.4 .

Hope you are not thinking that by adding the 2X TC on the 50mm f1.4 = 100mm f2.8 can do Macro too . :sweat:
Ask ... Absorb ... Equip ... Execute
N E X with M I N G HERE ! A P - Ming HERE ! Macro-Ming HERE ! Pano-Ming HERE ! Food ! Food ! Foods ! HERE
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Birder
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Alpha Master Jedi Mita Memori-san ’¹‚Ì’j clkoh

Haha Ming..
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Freeze That Moment!
My Flickr site
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RiRi
Alpha Elite Member
Actually i sort of understand the technical part of wad clkoh explained lol

Ming ,
Oops tat post was backdated to march 5th so din't quite see it XD

Everyone,
Thx for advice.

Think i'll use the 50mm and den crop some of my images for better pic quality.
I was thinking abt using it as a free 100mm lens but looks like i'll have to reduce a lot of other things just to get it -.-;

Might as well do some picture editing instead =/

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Ming
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90609866
Yes , get the 50mm f1.4 to shoot first , it really can do most of the shoots well , except Marcos ... :P
Ask ... Absorb ... Equip ... Execute
N E X with M I N G HERE ! A P - Ming HERE ! Macro-Ming HERE ! Pano-Ming HERE ! Food ! Food ! Foods ! HERE
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DewaKarma
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Beauty lies in the eyes of its beholder
jus hope u dun get the 500mm reflex + x2 tc ...hehehe...i doubt the moon can be seen...sun mayb ... :P
Think a new system...
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Trigger Happy
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Alpha Jedi Member
DewaKarma
Apr 22 2008, 09:47 PM
jus hope u dun get the 500mm reflex + x2 tc ...hehehe...i doubt the moon can be seen...sun mayb ... :P

why not? 1000mm f/16. that shd work esp on bright moon nights. no need to step down :lol:
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