Parafocal EF zoom?

[PC Greene]

For less than a Cooke etc?

Thank you,

 

[PC Greene]

Nothin huh?

 

[Russell Morris]

i'd say the Zeiss 15.5-45mm and 70-200 LWZ.2 would be Parafocal. but they are around $20k per lens

 

[Domenic Barbero]

Canon 70-200 Gl optics version. 6000 USD parfocal

 

[Andreas Kielb]

Sigma 18-35mm f1.8 in the G.L. Optics version maybe?
http://www.store-abt.de/store/index.php?page=product&info=110

 

[David W. Jones]

For a low cost production zoom, the Cooke 18-100 is hard to beat.

 

[Chad Lancaster]

Leica R 70-180 and 35-70/2.8

 

[Jacek Zakowicz]

Let me be the one that breaks the ranks here :
EVERY 35mm format lens is designed as parfocal (not parafocal BTW). They vary from one copy to another and vary in back focus due to workmanship/ tolerances/QC factors. On top of that cameras flange vary all over hell and gone since there are no standards and everyone is an expert ;-)
No lens design is going to solve that.
You don't need to look at lens designs- look much closer first- like put some effort in correctly adjusting your lens back focus and camera flange.
Putting on a flame proof suit now....

 

[Michael Hastings]

I thought OP wanted an EF zoom. Canon 24-70 2.8L is parfocal

 

[PC Greene]

Non GL version isn't quite parafical but thank you.

Sigma 18-35mm f1.8 in the G.L. Optics version maybe?
http://www.store-abt.de/store/index.php?page=product&info=110

 

[PC Greene]

Are you certain? I'm pretty sure it isn't at least wide open?

Thank you,

I thought OP wanted an EF zoom. Canon 24-70 2.8L is parfocal

 

[PC Greene]

Jacek we've gone over this before regarding my inquiries if Optotron could offer "zoom & focus intelligent linking" to make non parfocal (thanks) lenses so. Our back focus is well set, im not sure what you're suggesting regarding flange (adjust for every lens change? No thanks) PL zooms are perfectly parfocal & EF are simply not lol.

Thank you,

Let me be the one that breaks the ranks here :
EVERY 35mm format lens is designed as parfocal (not parafocal BTW). They vary from one copy to another and vary in back focus due to workmanship/ tolerances/QC factors. On top of that cameras flange vary all over hell and gone since there are no standards and everyone is an expert ;-)
No lens design is going to solve that.
You don't need to look at lens designs- look much closer first- like put some effort in correctly adjusting your lens back focus and camera flange.
Putting on a flame proof suit now....

 

[PC Greene]

Cool...want an R or M set pretty badly!

Thank you,

Leica R 70-180 and 35-70/2.8

 

[PC Greene]

Agreed...Any chance of getting this with EF mount?

Thank you,

For a low cost production zoom, the Cooke 18-100 is hard to beat.

 

[Jean Wallez]

Some infos here:
http://www.lensrentals.com/blog/2011/02/photo-lenses-for-video/4

 

[Jacek Zakowicz]

Jacek we've gone over this before regarding my inquiries if Optotron could offer "zoom & focus intelligent linking" to make non parfocal (thanks) lenses so. Our back focus is well set, im not sure what you're suggesting regarding flange (adjust for every lens change? No thanks) PL zooms are perfectly parfocal & EF are simply not lol.

Thank you,

I rest my case haha

 

[PC Greene]

What do you mean you "rest your case" Jacek?

You state every lens is designed as parfocal when virtually no EF mount glass actually is.

I have to say I find communicating with you challenging my friend

Thanks to those who answered the OP. Leica R seems like the best path for us currently...

Let me be the one that breaks the ranks here :
EVERY 35mm format lens is designed as parfocal (not parafocal BTW). They vary from one copy to another and vary in back focus due to workmanship/ tolerances/QC factors. On top of that cameras flange vary all over hell and gone since there are no standards and everyone is an expert ;-)
No lens design is going to solve that.
You don't need to look at lens designs- look much closer first- like put some effort in correctly adjusting your lens back focus and camera flange.
Putting on a flame proof suit now....

 

[PC Greene]

Very helpful...thanks Jean!

Fascinating that our Canon 70-200mk2 is not but the non IS version is.

Some infos here:
http://www.lensrentals.com/blog/2011/02/photo-lenses-for-video/4

 

[Jacek Zakowicz]

What do you mean you "rest your case" Jacek?

You state every lens is designed as parfocal when virtually no EF mount glass actually is.

I have to say I find communicating with you challenging my friend


Thanks to those who answered the OP. Leica R seems like the best path for us currently...

I mean that you don't even know what the back focus on your lens is and the flange depth on your camera but you already decided which lenses are or aren't parfocal. I.E you are an expert.
I do this for living.
I conceived , designed, built and manufacture peripherals that utilize these features and have tested and repaired lenses for for 25 years before that.
Sorry -parafocal won't fly here haha ;-)

 

[Nick Morrison]

The Canon FD 35-105 from Eddie Lens Doctor in EOS mount...worth a look...very small and light weight. Eddie refurbs zoom to be parfocal too (as it was orginally out of factory).

best