Why use a 135format lens mount?

Anvh
Posted 02/07/2010 - 17:20 Link
flossie wrote:
Ah I see what you are getting at now - the shorter distance gives you faster lenses. I couldn't see what great advantage shaving a few mm off a 50-135 would be! I still think it would be better to design better glass (especially more F2.8, no more F4 please...) in the first place than chasing ultra-low F-stops.
Ah yes but that would be easier to do with a shorter register distance.
The DA*50-135 could most likely be redesigned as a f/2 lens and the DA*60-250 maybe even a f/2.8 if there is some stress in it. The lens might become more expensive because larger glass is needed but at least it's possible to make such lenses.

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Or even better, go FF then you can gather even more light in the first place... (runs, hides...:lol. More seriously, things like an electronic shutter & fully EVIL would allow you to significantly reduce the registration distance, but this is still a few years away.
Ah yes but if you can compensate it far faster lenses it doesn't really matter
The electronic shutter is already in some DSLR camera's I believe, one of the Nikons had it.
EVIL cameras surely can get very fast lenses and that's one of the reasons they adapt the mount as well I believe. I believe the reasonable limit for f-number was f/0.7 and They can reach that with the current EVIL cameras.
Sadly I'm not a huge fan of the digital viewfinder, they still have a long way to go before they are suitable to fully replace the optical viewfinder.

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Funny enough Olympus had more than twice the market share in 2008 than Pentax
Didn't do them any good in the DSLR market, did it?
No not really but but well they did sell them.

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There's a lot of good things said in this thread which doesn't directly tackle your question, but does show why a new mount is a Bad Idea (tm) especially when you look at the failures of the past.


Anyway, we should know at/by Photokina what Pentax is up to - the only thing that is definate is that at least 1/3 of Pentax users will very vocally hate whichever direction they go (stay where they are, go FF, EVIL, m4/3, etc etc...)
I wouldn't mind any of those as long as they keep on going the way with the K-X and the K-7, certainly the K-X was a successful camera for Pentax.

And let's be honest, EVIL is probably the kind that will replace DSLR over time, not now and not over 10 years but it will happen most likely so I only hope that they wait with their EVIL camera till they are a bit more mature and can really compete with the DSLR market.
Stefan
Comment Image

K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Dangermouse
Posted 02/07/2010 - 17:47 Link
Anvh wrote:
Indeed Matt, I must say the camera's looks interesting and also really small.
Would have loved t see that Minolta would have embraced the mount for their digital cameras but sadly they didn't.
Actually, they did - http://www.camerapedia.org/wiki/Minolta_RD-3000

I have never seen an RD-3000 though, and I can't see 2.7mp being particularly stellar in performance terms...
Matt

Shooting the Welsh Wilderness with K-m, KX, MX, ME Super and assorted lenses.
MrCynical
Posted 02/07/2010 - 18:09 Link
Anvh wrote:
The DA*50-135 could most likely be redesigned as a f/2 lens and the DA*60-250 maybe even a f/2.8 if there is some stress in it. The lens might become more expensive because larger glass is needed but at least it's possible to make such lenses.
Case in point the f2 Oly standard zoom?
Anvh
Posted 02/07/2010 - 18:39 Link
Thank you Matt, it indeed looks like a very strange camera

MrCynical wrote:
Anvh wrote:
The DA*50-135 could most likely be redesigned as a f/2 lens and the DA*60-250 maybe even a f/2.8 if there is some stress in it. The lens might become more expensive because larger glass is needed but at least it's possible to make such lenses.
Case in point the f2 Oly standard zoom?
Yes, the 4/3th mount is roughly physical the same as the k-mount but has a register distance off 38.67mm instead off 54,46mm of the k-mount so it gives you an idea what a few millimetres can do.

I think many don't Like the 4/3th because the sensor is smaller but I could be wrong though.
At least it would be interesting to see what such a camera would do if they would bring it out with two f/2 zooms and a f/0.8 or f/0.9 normal prime lens and the capability to use adapters.

I already said it on page 2 but if they could make the mount so that they could make adapters to fit most of the current camera brands it could get very interesting.
Canon or Nikon would off course never officially support the adapter but if they could back engineer it like Sigma does.
Stefan
Comment Image

K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
flossie
Posted 02/07/2010 - 19:54 Link
careful not to get your 4/3rd's mixed up

[quote="Wackypedia"]"Differences between Four Thirds System mount and Micro Four Thirds System mount: Mount diameter reduction; As a result of research aimed at facilitating the design of compact, lightweight lenses while maintaining the current strength, the outer diameter of the lens mount has been reduced by approx. 6 millimetres (0.24 in). ... the Micro Four Thirds System ... specifies the optimum flange back length required to reduce camera size and thickness, assuming the omission of the mirror box. The flange back length has been reduced to about 1/2 that of the Four Thirds System."[/quote]
Still shooting in the dark (literally and metaphorically)...
Anvh
Posted 02/07/2010 - 21:26 Link
flossie wrote:
careful not to get your 4/3rd's mixed up
I didn't, Micro 4/3th has a register of 20mm and a diameter of around 38mm.

Micro is also for EVIL and my intentions where for APS-C DSLR solely to get faster lenses for it and a slightly smaller camera.
Stefan
Comment Image

K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Edited by Anvh: 02/07/2010 - 21:26

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