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To KM SEA : Serioius question about 85.4G (D)

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imgconcept

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Hello KM SEA.

There are so many users complaning that 85mm F1.4 G (D) is having a
very serious problem with AF when Used at 5D. 7D seems to have less

problem. I heard that a new firmware or software is being written for this issue.

I would like to really know when we will have a new firmware update
for 7D and 5D? 7D is the big bro but performance is not equivalent to
5D. There must be a treat soon.

We 7D users are all waiting for it for months. Please let us know when..
Thanks.

--
Minolta in mind, Always.
 
imgconcept said:
There are so many users complaning that 85mm F1.4 G (D) is having a
very serious problem with AF when Used at 5D. 7D seems to have less
problem.
Click to expand...
The 7D/85mm f/1.4 problems in the past were backfocus
related, due to sensor malposition. I don't think the lens model
itself was ever reported as being defective or incompatible.

KM can fix your BF if that is the problem you are having with
the 5D at f/1.4.

--
Matt Cham

My Gallery: http://mattcham.fotopic.net/
 
I own a 7D with 85.4 G (Non-D) so I have no issue.

However, I see lots of 5D users reporting the problem and
even shops who sell the D type always ask the buyer if they are
using 5D. If the buyer say so, they simply say to the buyer,
"DON"T BUY IT because IT will Have problem with 5D.

And the major problem they are concerned is not even the back focus issue. Their issues come from when Focusing,
it can't auto focus the object which the shooter was trying to shoot.
It takes so long trying to focus then it gives up. That is the problem.
--
Minolta in mind, Always.
 
Hey Loren,

Can you tell me more detai about the focus issuel? Since I'm planning to get a 85 1.4 or 135 STF from Adorama.

--
Marvin
------------------------------------------
7D Rock!
Minolta 50mm f1.7
Tamron 28-105mm f2.8 SP
Minolta 80-200mm f2.8 APO {black}

Canon AF+Nikon flash+Minolta body & AS+Kodak color+Fuji DR+Lecia lenses....what a wonderful world...
 
imgconcept wrote:
...Their issues come from when Focusing,
imgconcept said:
it can't auto focus the object which the shooter was trying to shoot.
It takes so long trying to focus then it gives up. That is the
problem.
Click to expand...
I have the same problem with 85/4 G(D). When focusing, I cannot help myself, I think that AF tries to be very quick and iterates several times about the focus point and the result is often bad.

But, my 7D has generaly some problem with AF - very often out of focus... I am just waiting to try new comming firmware before sending it to service.
 
Ok. here is the issue.
85.4 G (D) seems to have compatibility issue with 5D.
It's generally observed and most of the 5D users who purchased it
are refunding or not buying it anymore.

For use with 7D, I hear once in a while that it might have sort of
back focus issue but that's all.

So. are we about to pay extra bucks for the D type?
Well, do you use ADI metering? few people tested it and reported that
ADI often gives underexposure and most of the case if we are
using a Omni bounce on the flash, we use p-TTL.

So, It's your choice, but I don't feel 85.4 G (Non-D) is a bad choice at all.
I really love my 85.4 G.

Also, think twice about the 135 stf.. It's manual focus and kind of very

hard to use. quite few people from my korean minolta club own this stf but they are saying it's quite hard to handle. Perhaps you need to install a
split screen?

BUt my last word is.. if you like the way the lens look, go for 85.4G or G(d)
Big lens always look very nicer.

Hope to see you around in Toronto.

--
Minolta in mind, Always.
 
Thanks for the headup, eventually I use MF half of the time.

The biggest issue for me is the crop factor, which make the 135 become 202.5, and also the effective apeture is only 4.5...kind of slow for me.

The 85/.4 will fit the bill quit nicely, and I use spot metering most of the time. However, I also find that ADI always give me underexposure.....anyway, I will do somemore more research

The bokeh from this 2 lenses killing me hard!

See you around soon

--
Marvin
------------------------------------------
7D Rock!
Minolta 50mm f1.7
Tamron 28-105mm f2.8 SP
Minolta 80-200mm f2.8 APO {black}

Canon AF+Nikon flash+Minolta body & AS+Kodak color+Fuji DR+Lecia lenses....what a wonderful world...
 
Yes, Same as here. 85/f1.4 G D had a problem even with dynax 7( film camera) it's keep focusing on and on so annoying me a lot. :(

I think problem was coming from the lens not the camera.....

you think so?
 
I think you guys totally misunderstanding what I'm saying.....

"The biggest issue for me is the crop factor, which make the 135 become 202.5, and also the effective apeture is only 4.5...kind of slow for me."

Of cause crop factor WOULDN'T affect apeture.......Can you read my sentence again???

"crop factor, which make the 135 become 202.5" (this is the crop factor's effect)

"AND also the effective apeture is only 4.5" (this is what I don't like about the lens, and do you guys even know the spec of this lens 135 STF [2.8/4.5]? and do you guys know how this lens work?, maybe you guys should do some research b4 saying it loud, in here we got alot more knowledgable people than you think.)

What happen to MTF lately........sign.....

--
Marvin
------------------------------------------
7D Rock!
Minolta 50mm f1.7
Tamron 28-105mm f2.8 SP
Minolta 80-200mm f2.8 APO {black}

Canon AF+Nikon flash+Minolta body & AS+Kodak color+Fuji DR+Lecia lenses....what a wonderful world...
 
mlam3d said:
I think you guys totally misunderstanding what I'm saying.....

"The biggest issue for me is the crop factor, which make the 135
become 202.5, and also the effective apeture is only 4.5...kind of
slow for me."

"AND also the effective apeture is only 4.5" (this is what I don't
like about the lens, and do you guys even know the spec of this
lens 135 STF [2.8/4.5]? and do you guys know how this lens work?,
maybe you guys should do some research b4 saying it loud, in here
we got alot more knowledgable people than you think.)
Click to expand...
Sorry for the misunderstanding. You are correct. The T-stop of the 135mm f/2.8 STF is f/4.5. Of course, this doesn't affect DOF, but the lens transmits less light. DOF would be based on f/2.8.

For those who don't know, T-stop is an indication of the amount of light actually transmitted by a lens, since some light is lost due to internal reflections, multiple glass surfaces, etc., whereas F-stop is simply the ratio of focal length to aperture. Most lenses are so efficient these days that a T-stop is not even given. However, apparently, the STF doesn't transmit quite as much light as other f/2.8 lenses.

By the way, some people talk about lenses having different effective apertures on cropped sensors because of the way DOF is rendered differently on different size media (usually misunderstood). For a minute, I thought that's what you might be talking about. Thanks for clearing up your intent.

Either way, it's a lens I'd love to have someday, but it's not on my short list. If I ever win the lottery, maybe I'll get a 9D, have a split screen installed, get the STF and use it exclusively on that particular 9D. I could use my AF lenses on my other 9Ds. :)

Jay
http://www.jpwphoto.com
 
At first I was thinking about my english language (even I'm living in Toronto now, but my 1st language still cantonese) but I think twice, my statement shouldn't be any problem at all (alease I think...)

The 135 STF is not at the top of my list as well, which still be a 85/1.4G or a wide angle zoom lens (kind of extreme isn't it? ha) however, I find a used 135STF in HK for sale, so thats why I brough it up. :)

Anyway, good explaination. Too bad here we don't have sticky thread otherwise I think we should open some thread to talk about lens design and how Minolta's lenses are different than the others.

--
Marvin
------------------------------------------
7D Rock!
Minolta 50mm f1.7
Tamron 28-105mm f2.8 SP
Minolta 80-200mm f2.8 APO {black}

Canon AF+Nikon flash+Minolta body & AS+Kodak color+Fuji DR+Lecia lenses....what a wonderful world...
 
"However, apparently, the STF doesn't transmit quite as much light as other f/2.8 lenses."

That's part of the lens design. It incorporates a graduated filter in it's construction that is not removable, and is responsible for a 1 1/2 stop loss of light.

Anyway. It's a fantastic lens, but one quite difficult to master. Also, because of the crop factor, I don't think it's such a good idead to use this lens for indoor portaiture. At 200mm you would have to stand quite far away - which might not be possible. Sadly, this sometimes applies even to the 85mm lens, so a compromise would be the 50/1.4.
 
Hi Craig,

I'm not really that flame as what I mean to be. I'm sorry. Maybe which is because I'm started to growth into more aggressive into photography technology/knowledge. and it's abit weired for me being kind of challenge with a statement like this "Shame if someone bases a lens decision on that assumption."

I'm sure you are not really intented to said that as well, since you mistaken what I'm saying :)

Always like your shots and also your CG work. BTW which title you working on now? I'm not into 3D anymore but graphic design (i have a computer animation diploma :)) and 2 of my friends (ex-classmate) are now working with Capcom.

Happy shooting! and no more misunderstanding!

--
Marvin
------------------------------------------
7D Rock!
Minolta 50mm f1.7
Tamron 28-105mm f2.8 SP
Minolta 80-200mm f2.8 APO {black}

Canon AF+Nikon flash+Minolta body & AS+Kodak color+Fuji DR+Lecia lenses....what a wonderful world...
 
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