imagemeister Loc: mid east Florida

This is a Promaster Spectrum 7 1.4X optical extender for the Sony/Minolta A-mount. It is a quality 5 element design and shows the correct computed f-stop on my A99 and there is no gear reduction on the focus drive so it is fast (1:1). I have only used it with the Tamron 300 f2.8 lens. I decided to break down and get the 1.4X Minolta APO extender. These 5-element 1.4's for the A-mount are quite scarce today ! Comes with front and rear caps. And. just so you know, the Minolta APO extenders will only fit the Minolta/Sony APO lenses AND the Tamron 300 2.8 due to physical size.

CONDITION: EXC - no known issues - worked great with 300 2.8 Tamron on my A99.

$65 shipped to lower 48 U.S. - PayPal preferred.

Thanks for stopping by Sony fans ! .......Larry
.

(Download)

dpullum Loc: Tampa Florida

APO extender ??? so I looked. Good data as to which lenses this will work with and why. Ebay and Amazon show the price here is a bargain.
https://www.dyxum.com/lenses/teleconverters.asp

olemikey Loc: 6 mile creek, Spacecoast Florida

Looks like a nice one, will do someone well.

imagemeister Loc: mid east Florida

Thanks for the link ! - It has been quite awhile since I attended this web page .....8-)

chapjohn Loc: Tigard, Oregon

Any thought about whether or not this 1.4x will work with the EA4 adaptor with the Tamron 200-500 (A-mount) lens?

imagemeister Loc: mid east Florida

Can your body AF @ f9 ??

photogeneralist Loc: Lopez Island Washington State

I heard somewhere, but cannot verify, that telextenders do not play nicely with zoom lenses. Can anyone out there confirm or idisprove that nugget of info?

imagemeister Loc: mid east Florida

IMO, (I cannot verify or prove this - but experienced common sense tells me) the major manufacturers - at least up until this point in time, have always deigned and optimized their tele-extenders to go with their 300mm f2.8 prime lenses. Most zoom lenses ( a very general statement), optically, are far removed from a 300mm prime and consequently they are handicapped when used with OEM extenders.

I will tell you, the Sigma 100-300 f4 is one of the BEST zooms to work with extenders ! - my experience.

Ideally, an extender will be optically designed and dedicated for a single unique lens - as in the case of the Canon 200-400 and Nikon 180-400 zooms.
.