Search results for 'back focus' - page 633
smc-m 20/f4 - is someone using it? I need some opinions.
Hi, I would go along with what John said. I used to have a K version of the 20/F4. It was a good lens but like the M version did suffer from quite a bit of distortion and this will show regardless of the resolution. I now have the A version of the 20/F2.8 which is the same construction as the FA. I...
Posted by Kim C on 07/11/2004 - 13:50
K mount lens speed on *ist ds
Hiya I've been looking at the *ist DS as my step into the digital slr race. I've got a very reliable and still well used Pentax K1000 with quite a few of the K mount bayonet lenses. If i understand the posts so far these will fit the *istDS? If so what differences will using them make over the ...
Posted by Kaylesh on 18/10/2004 - 20:24
Help with jammed focus on Pentax F 70-210
I was going to buy this used lens at a local store for $89 but it would not focus. The focusing is completely jammed and just twitches and goes "clunk" when the camera tries to focus. Otherwise the lens looks perfect. I am going to buy the lens for $10 with lens caps. Hey the caps are worth that....
Posted by Powell on 30/10/2004 - 21:50
Help with jammed focus on Pentax F 70-210
Personally, I wouldn't try it again on a camera until you've freed it by hand. Try gently turning the AF coupler (with a small watchmaker's type screwdriver) back and forth to see if that frees it. You could try turning the focussing ring but it would be quite easy then to strain an internal mechan...
Posted by Kimbo on 31/10/2004 - 01:23
Help with jammed focus on Pentax F 70-210
The clerk tried the lens on a couple of the stores bodies. I tried a screw driver gently in the focus drive. It is locked solid at infinity. There is some slack but no give at all. Guess I will try opening the lens and see what I can find. The good news is when I went to purchase the lens...
Posted by Powell on 31/10/2004 - 06:01
Help with jammed focus on Pentax F 70-210
G'day. I had a F 35-105 do the same thing. I ripped it apart and found a small piece of grey plastic had broken off of somewhere unknown and was jammed solid in the gears of the AF drive. Removed the jammed plastic, reassembled, And the lens is still working fine. Buggered if I know where the pla...
Posted by glock40sw on 31/10/2004 - 11:37
Help with jammed focus on Pentax F 70-210
Thanks Trevor Any hints on best way to get to the gears? Any other tips from your experience appreciated. Powell
Posted by Powell on 31/10/2004 - 19:43
SMC-F 1:1.7 50mm
George, With regard to the 50mm lens, I was referring to the focussing ring as both the focussing and zoom positions retract on FA zooms. The Z1-P manual refers to this as a function of FA zoom lenses only, so 'fair enough' - presumably Pentax did not consider the extension of a prime lens due to...
Posted by Kimbo on 21/11/2004 - 21:02
Pentax 17-28mm anyone used it?
I'm finally preparing to break down and buy a good piece of Pentax glass for my ist D. I have had a lot of trouble with non-Pentax lenses (Sigma, Tamron) not focussing correctly and creating photos that I'm not real pleased with. <<<WARNING- don't expect a Tamron 28-300mm f3.5 to perform ...
Posted by Anonymous on 13/11/2004 - 01:19
Requesting opinions on Takumar lenses
Hi Simon, No need for a special tool. Just use a rubber bung to turn it. The trick is that it is reverse threaded! I just grabed a lens bung to try it but anything that will grip the surface will do. There is a collar underneath but your lens spanners should cope with that. It's worth downloading t...
Posted by Kim C on 13/12/2004 - 15:31
Lenses for mx and zx50-need some help
:o i have mx and a zx50. i have an smc 135mm for mx and several sigma zooms for the zx50. if i buy a 28mm fixed focus and a 80-320 for the mx will these lenses be useless for the zx50? budget is really a problem here as i am not george soros. is there another way out of this? ie will an auto foc. le...
Posted by humblejohn on 27/11/2004 - 19:43
Lenses for mx and zx50-need some help
i put the 135 mm manual lens from my MX into a zx50 in manual (M) mode. the latter will take the lens, as you stated, but the strangest thing is that there is an audible "beep" when the manual lens is in focus. I, of course, set the f/ and the shutter speed. In addition, in the zx viewfinder the fl...
Posted by humblejohn on 28/11/2004 - 15:01
Lenses for mx and zx50-need some help
The beep is focus confirmation from the camera I think. My MZ3 will do that if I switch on the sound. If I set it to autofocus and use a manual lens it will not release the shutter unless the image is in focus - perhaps that's something else you could try?
Posted by johnriley on 28/11/2004 - 16:04
opinion for old 135 mm f2.8 mm Telephoto lens
if you do not win the auction. post back here i have one I no longer use. Jayson (ardent if I had logged in)
Posted by Anonymous on 02/12/2004 - 19:58
The 85mm lenses
Hi George, From the lens data tables and personal experience, I would aggree that the early bayonets were the SMC Taks with a different mount. This is probably no bad thing as many of these are still considered tobe some of the best glass Pentax has produced. However, I don't think they were meant ...
Posted by Kim C on 14/02/2005 - 13:03
The 85mm lenses
Hi George, I hadn't realised that the OM1 had come out so early. It just goes to show the longevity of the camera and the power of advertising. Although I had taken pictures for some time, my real interest in photography started in 1971 when I went to Newcastle University. There was a darkroom i...
Posted by Kim C on 15/02/2005 - 10:59
SMC Pentax-DA 40mm f/2.8
Ardent/Jayson, Keep saving. It's a lovely piece of kit, though the slight grinding of the gears as you focus can never compare with the absolutely silky smoothness of a good old screw mount Tak. (Anyone reading this who has never experienced the wholly sensual feeling imparted by an SMCT 55mm...
Posted by George Lazarette on 19/12/2004 - 20:48
Pentax FA 100/2.8 macro lens
I think what is being referred to is the change in illumination of a lens as it is focused closer. Normally this effect is not important, but it becomes noticeable around a magnification ratio of 1:10 and greater. That is why 50mm lenses usually focus down to 50cm or so, and 100mm lenses say down to...
Posted by johnriley on 01/01/2005 - 21:15
Newbie needs help??
Just to add to Kim's reply, compatible Pentax lenses all have one of the following suffixes after the SMC Pentax designation: -A -F -FA -FAJ Except for the FAJs, which have no aperture ring, these lenses can be identified by the letter A at the extreme end of the aperture scale, next to th...
Posted by George Lazarette on 05/01/2005 - 07:08
Another newbie needs help
If you stick to SMC Pentax-FA or -F autofocus lenses, you will know that they are compatible and that you are getting the best quality. Some zooms will go down to a magnification ratio of 1:4 which is 1/4 life size, not bad at all. A proper Macro lens will be a fixed focal length but will go down...
Posted by johnriley on 12/01/2005 - 09:23
