Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-04-2009, 07:13 PM   #16
Veteran Member
alohadave's Avatar

Join Date: Jan 2008
Location: Quincy, MA
Photos: Gallery | Albums
Posts: 2,024
QuoteOriginally posted by Marc Sabatella Quote
Do Canon lenses have contacts that allow the camera to tell the lens to rotate a polarizing filter so you can do that using the rear dial?
That would be an awesome feature!

02-04-2009, 10:07 PM   #17
Veteran Member
Venturi's Avatar

Join Date: Mar 2008
Location: Tulsa, OK
Photos: Gallery
Posts: 2,636
QuoteOriginally posted by alohadave Quote
That would be an awesome feature!
Sony is about to do one better - they're integrating AIBO into their next line so not only do you no longer need a zoom lens ... you won't need a photographer!
02-04-2009, 10:45 PM   #18
Veteran Member




Join Date: Jan 2009
Location: Canada
Posts: 1,252
The outdated belief that debts are to be honored and that paper money is worth something is holding the world economies back. World leaders are now working hard to ameliorate both of these problems.
02-04-2009, 11:10 PM   #19
Veteran Member




Join Date: May 2008
Location: Rhode Island
Photos: Albums
Posts: 4,180
The K-mount is one of the best things Pentax has going for it. Perhaps you could ask your friend what exactly his argument is, then you could at least represent him more fully.

Friends certainly do not have to agree on everything, this would be boring. But they do need to develop their arguments at least enough so they are understood.

02-05-2009, 10:24 AM   #20
Veteran Member




Join Date: Dec 2006
Location: carpentersville, IL
Posts: 693
QuoteOriginally posted by Gooshin Quote
did your experienced friend tell you WHY he believes the k-mount is a hinderence to pentax??
I would also like to know this. What exactly about the k-mount is outdated, hurting pentax?
02-05-2009, 12:32 PM   #21
Inactive Account




Join Date: Dec 2008
Location: Ames, Iowa, USA
Photos: Albums
Posts: 2,965
From an electronic standpoint, 9 contacts is sufficient to pass a huge amount of data in the time required to set up a photo, so it isn't limited from the digital logic/control standpoint.

The mechanical screw-focus capability is great for inexpensive or legacy lenses.

Finally, the mount's clear open diameter is more than sufficient for FF or smaller sensors.

That all boils down to saying it is difficult to see how to improve it (at least from Pentax' viewpoint.)

But I'd really like to see a universal standard mount (that includes the focus screw & motor.)

Dave
02-05-2009, 12:42 PM   #22
Veteran Member
dws1117's Avatar

Join Date: Dec 2006
Location: Spring, TX.
Photos: Gallery
Posts: 1,157
Original Poster
QuoteOriginally posted by dave sz Quote
I would also like to know this. What exactly about the k-mount is outdated, hurting pentax?
His flawed logic is mainly that it's old. Of course old doesn't mean that it is broken or there is anything wrong. He also thinks that since Canon has changed their mount that there must be a reason. Like I said earlier. His argument doesn't make sense.

02-05-2009, 01:36 PM   #23
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,434
QuoteOriginally posted by dws1117 Quote
His flawed logic is mainly that it's old. Of course old doesn't mean that it is broken or there is anything wrong. He also thinks that since Canon has changed their mount that there must be a reason. Like I said earlier. His argument doesn't make sense.
Canon changed their mount to steal Nikon users. They had to change to eliminate the clunky breech lock as well. While they were at it they upgraded the electronics
Canon EF lens mount - Wikipedia, the free encyclopedia
the EF lens mount works with adapters due to its large diameter and the relatively short flange focal distance of 44.0 mm[3]. It is possible to mount lenses using the Nikon F mount, Olympus OM, Leica R and universal M42 lens mounts (among others) by the use of a mechanical adapter
Shortening the registration distance caused a lot of extra engineering work to overcome the mirror swing
Canon FD lens mount - Wikipedia, the free encyclopedia
Pentax "backward" compatibility is a 2 edged sword...
Pentax needs to make electronic aperture couplings and better feedback/more data lenses.

The KAF mount is capable of much more but.....Unfortunately building cameras for 2 systems cuts into the profit margins.
They have started the process (no aperture rings, bodies w/out in body motors)
Pentax is risk adverse and, wisely enough, did not do a Canon surgical strike. When Canon threw the old mount out there was quite an uproar in the media and Canon users. They lost but gained in the long run.

Last edited by jeffkrol; 02-05-2009 at 01:42 PM.
02-05-2009, 02:51 PM   #24
Moderator
Site Supporter
Blue's Avatar

Join Date: Jun 2008
Location: Florida Hill Country
Photos: Gallery | Albums
Posts: 17,377
QuoteOriginally posted by dws1117 Quote
Nope he can't get one. never been married.

1st: Tell him to move out of mamma's basement.
2nd: Tell him to learn something about Pentax's K-mount. It has changed as needed since being introduced. Show him a 50mm k lens, 50mm M lens, 50mm A lens and an FA 50mm f1.4 lens and a DA ltd lens. Then explain to him that they are generally, reverse compatible AND forward compatible.

3rd: Tell him that the F mount will actually fit a Pentax body with some play and can actually be focused in completely manual mode.
02-05-2009, 08:38 PM   #25
Veteran Member
dws1117's Avatar

Join Date: Dec 2006
Location: Spring, TX.
Photos: Gallery
Posts: 1,157
Original Poster
QuoteOriginally posted by Blue Quote
1st: Tell him to move out of mamma's basement.

Come one now, that's a but harsh to judge someone in that manner based entirely on one observation, even if it is wrong.

The rest of your post I'm with you. I wish I had all of those lenses to show him. He is just getting back into photography after being away from it for more than 10 years. I guess he is learning like most of us. It's just an observation.
02-05-2009, 08:59 PM   #26
Moderator
Site Supporter
Blue's Avatar

Join Date: Jun 2008
Location: Florida Hill Country
Photos: Gallery | Albums
Posts: 17,377
The basement comment was a jest.
02-05-2009, 09:00 PM   #27
Veteran Member
dws1117's Avatar

Join Date: Dec 2006
Location: Spring, TX.
Photos: Gallery
Posts: 1,157
Original Poster
Sorry for misinterpreting the intent.
02-05-2009, 09:23 PM   #28
Inactive Account




Join Date: Oct 2007
Location: Brisbane, QLD, AUS
Posts: 3,261
Squeeze? It's not a zit, fergawdssakes. Nor a boil, or any other sort of dermatological ailment.

Yes, Canon and Nikon have changed their mounts. Canon change from the FD breech mount to the EOS bayonet. Why? Well, they were the early king of AF, and they had to accommodate for that.

Before that, Canon played catch-up to Nikon in the SLR race.

Also, it meant every one had to buy a new set of lenses.

*cough*.

Due to the longer FTF distance of the EOS mount, you can't even adapt the FD lenses without losing infinite focus, or getting some heretical adaptor with an element in it.

Does this friend shoot Nikon? If so, slap him across the back of the head.

Why? Because, for years, Nikonians harped on maniacal about their backwards compatibility.

Sure you can use an old lens on a modern Nikon!*

*If the old lens has been sent back to Nikon to get a chip put in it. No, not that chip. The new one. No, not for that lens. Wait, do you have a pro-grade Nikon? No? Then, sorry, you're stuck with buying new lenses.

So, you had to buy new lenses. Or get your old ones chipped.

*cough*

Having said that...what in the name of Rennie Ellis is wrong with the K?

About the only fault with it you could possibly find with it, as with all lens mounts, is that it doesn't hold the lens on right. Which it does. That's something that would be pretty hard to stuff up.

More electrical contacts? Fine. Pentax uses the flat of the metal mount to place the contacts. I think Pentax has only find about 100-odd degrees of that. 260 more degrees to go. Canon uses that plastic tabs on the inside of the mount, so does Nikon. So the metal tabs of the lens mounts with get in the way if you want to add more contacts.

And, please, the F mount's limitations are greater than the K's, but all the time, it's made out that it's the other way around. The limitations of putting an M lens on a K100D? You have to use stop-down metering. The limitations of putting an early, unchipped F lens on a Nikon D40? YOU CAN'T USE IT AT ALL.

There are limits to the current Pentaxes, yes. But they're not the fault of the mount.
02-05-2009, 09:51 PM   #29
Veteran Member
dws1117's Avatar

Join Date: Dec 2006
Location: Spring, TX.
Photos: Gallery
Posts: 1,157
Original Poster
QuoteQuote:
Does this friend shoot Nikon? If so, slap him across the back of the head.
I do all the time. He has shot with all three back in film.
02-05-2009, 10:07 PM   #30
Moderator
Site Supporter
Blue's Avatar

Join Date: Jun 2008
Location: Florida Hill Country
Photos: Gallery | Albums
Posts: 17,377
QuoteOriginally posted by dws1117 Quote
I do all the time. He has shot with all three back in film.
All 3? You mean Pentax, Olympus and Minolta?


j/k
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, k-mount, mount, pentax, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
adapters for non-K-mount lenses to Pentax K-mount DSLRs: new dimensions for LBA Douglas_of_Sweden Pentax Camera and Field Accessories 154 07-10-2020 10:57 AM
Hurting for a Sigma 100-300mm, F4 donallison13 Ask B&H Photo! 1 11-03-2010 11:25 AM
Damn You Australians! Stop Hurting Us! GoremanX General Talk 36 03-21-2010 08:16 PM
My eyes are hurting! Tom Lusk Pentax News and Rumors 31 01-25-2008 05:55 PM
For Sale - Sold: FA: Original PENTAX Screw Mount to K Mount Adapter M42 HogRider Sold Items 0 10-21-2007 02:12 PM



All times are GMT -7. The time now is 02:25 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top