focus optics, any good?

PsychoBoy · 21st October 2002

has anyone try any lens from focus optics? I am more interested in their teleconverters. wonder if they are any good. anyone? or any website that has more info?

Thank you.

PsychoBoy · 22nd October 2002

no one heard of it? I saw them here

nEkOgOtCh · 22nd October 2002

Quote:

Originally posted by PsychoBoy
no one heard of it? I saw them here

Wah piang oi! This is one of my first and major regret in getting this lens

Focus Optics 58mm 0.5X.

Caused so much of a vignetting that really distorts the picture. This was used together with another lens 28-90 and at 28mm the vignetting is really bad :l And blurry too.

To make things worse, it seem to cut my light by 1/2 to 1 stop. Not sure why but it did :l

Oh yes, it causes your shots to look grainy too. Once again not sure why though. If you want and can use, I can loan it to you to try it out ;P

PsychoBoy · 22nd October 2002

Quote:

Originally posted by nEkOgOtCh

Wah piang oi! This is one of my first and major regret in getting this lens Focus Optics 58mm 0.5X.

Caused so much of a vignetting that really distorts the picture. This was used together with another lens 28-90 and at 28mm the vignetting is really bad :l And blurry too.

To make things worse, it seem to cut my light by 1/2 to 1 stop. Not sure why but it did :l

Oh yes, it causes your shots to look grainy too. Once again not sure why though. If you want and can use, I can loan it to you to try it out ;P

0.5x is wide angle right? wah! really that bad huh? the sample picture shown there still look quite ok somemore.. the price looks cheap on the web page but useless if the quality is bad...

mpenza · 22nd October 2002

from the samples, you could see that the lenses are not properly speced. The pics taken with 2.0x tele and 0.5x wide didn't vary as much as what real 2x and 0.5x should.

Zerstorer · 22nd October 2002

Quote:

Originally posted by PsychoBoy

0.5x is wide angle right? wah! really that bad huh? the sample picture shown there still look quite ok somemore.. the price looks cheap on the web page but useless if the quality is bad...

Look closely again, the 2X tele shot exhibits CA as well as corner softening. With a clearer/larger picture it may be more obvious.

nEkOgOtCh · 22nd October 2002

Quote:

Originally posted by Zerstorer

Look closely again, the 2X tele shot exhibits CA as well as corner softening. With a clearer/larger picture it may be more obvious.

Likewise, the 0.5X wide angle does the same thing together with vignetting

Perhaps the next SEED u can come down and remind me so that I can show you the pix I took :|

If you observe their samples, they actually show signs of under exposure as compared to the original pix

21st October 2002	#1
PsychoBoy Member Join Date: Apr 2002 Posts: 332	focus optics, any good? has anyone try any lens from focus optics? I am more interested in their teleconverters. wonder if they are any good. anyone? or any website that has more info? Thank you.

22nd October 2002	#5
mpenza Moderator Join Date: Jan 2002 Location: New York City Posts: 13,397	from the samples, you could see that the lenses are not properly speced. The pics taken with 2.0x tele and 0.5x wide didn't vary as much as what real 2x and 0.5x should. Last edited by mpenza; 22nd October 2002 at 10:46 AM.