Search results for 'back focus' - page 639
Extension Tubes
I don't think it would be possible to transmit autofocuis through the tubes unless the motor is in the lens, which would make for some prettty costly lenses. But other functions, like metering, are useful since it avoids having to do calculations for exposure compensation because of the extension. ...
Posted by Kim C on 03/10/2005 - 15:26
Extension Tubes
I had a set of Pentax extension tubes, but manual stop-down metering was a bit of a pain. So I ebayed them ;) Got hold of a cheap set of second hand "Teleplus" extension tubes which have the electrical contacts. This allows auto matrix metering, and all the other modes. Focus is manual, but that's ...
Posted by MattMatic on 04/10/2005 - 06:19
Extension Tubes
To retain full auto and program metering on the *istD you need extension tubes with seven electrical contacts. As there are no optics involved, non-brand tubes will be just as good as any others. Steve One point to bear in mind is that although there is no glass involved, the optics are still ...
Posted by Kim C on 05/10/2005 - 09:37
Pin Hole "Lens"
And I thought this may be a dead subject!! Talk about back to basics! Thank's for all the info and links! Now, nobody move, breath or blink for the next 10 minutes..........
Posted by Anonymous on 03/10/2005 - 14:54
pentax screw mount bellows lens
Hi, One point to note which hasn't been mentioned is that the unlike the Macro lenses, the bellows lenses have no focus ring as this is done using the bellow. As such they can only be used with the bellows. Unless you intend to do macro work, I would be tempted to try and swap it for a good standar...
Posted by Kim C on 06/10/2005 - 10:23
Novice user lens question
KA is a manual focus lens with A setting KAF is autofocus mount KAF2 is autofocus mount with power zoom compatibility. All these are fully compatible with the *istDS, so all your lenses should be fine. However, the 18-55mm Pentax lens bundled with the *istDS is a very nice lens indeed, and f...
Posted by johnriley on 11/10/2005 - 00:04
Filters & Light Refraction
A HA! George is about to save me a WHOLE bunch of money. Goerge, if I've got SMC Pentax lenses, and am using them under the proper conditions, I should take the protective UV filter OFF and simply be careful? I have nice hard sunshades for my 135 and 200 Super Taks which should protect my len...
Posted by Anonymous on 12/10/2005 - 22:35
Filters & Light Refraction
Every filter in the world, no matter how well made or expensive, will degrade your image to some degree. Cautious people slap cheap filters on their lenses to protect them. I prefer to take a little care and get the full benefit of my expensive glass. You can apparently stub a cigarette out o...
Posted by George Lazarette on 13/10/2005 - 00:05
Filters & Light Refraction
Nots' to worry Mac, I've found it :D The sneaky little devil hid it between the sofa cushions, it had been missing for two days and trust me, apart from looking everywhere else, I'd all but taken that sofa apart. I'd removed the cushions, tipped the sofa upside-down and even checked inside the ...
Posted by Kimbo on 13/10/2005 - 15:33
Filters & Light Refraction
Kimbo, if you're printing to anything up to 18x12" then www.proamimaging.com are superb. I've had some 16x12" prints done and they are absolutely stunning (even if I say so myself :P ) and extremely cost effective ;) Small snag is you have to prepare everything - colour space, image size etc and pos...
Posted by MattMatic on 13/10/2005 - 17:34
M42 lenses on *ist-DS
The way the adpater is designed to work is that you first screw it onto the back of your lens. Then you bayonet the whole thing into the camera body. When you unscrew the lens the adapter will stay behind, thus effectively from then onwards turning the bayonet body into a screw mount body. Screw fit...
Posted by johnriley on 17/10/2005 - 17:08
1:1.2 Supertak M42 Oldie - Good?
Hi Mac, Not an easy question to answer. There were at least 6 versions of the F2 Super Tak. If you can post a serial number and/or part number, I will try and find out which yours is. (The part number is on the back of the auto/man switch.) This is rather important as the early versions are NOT com...
Posted by Kim C on 18/10/2005 - 13:19
1:1.2 Supertak M42 Oldie - Good?
I just went back and looked at the picture again and sure enough Kim was right - it WAS an 1:2 55mm lens. (Not 1:1.2) So the whole question was bogus. (But the replies were amazingly educational and as always, much appreciated!) I apologize for the confusion - really thought I was on to somethi...
Posted by Anonymous on 18/10/2005 - 19:43
Leica 39mm - K mount adapter. Does it exist?
The reason for asking is that I am still wondering how to get a good super-wide-angle for my D. The preferred option (at present) is the 12-24mm zoom. BUT, the Voigtlander 12mm lens is fairly well thought of (bar the light fall-off, which will be less noticeable on APS), and probably quite a lot...
Posted by George Lazarette on 18/10/2005 - 22:23
Leica 39mm - K mount adapter. Does it exist?
Hi George, I haven't come across a direct L39 to K mount adapter. The people to speak to are SRB here http://www.srbfilm.co.uk They certainly do an adapter to fit an M42 lens on a LTM body for just under £20. The only problem I can think of is that the film plane/lens mount distance is much less. T...
Posted by Kim C on 18/10/2005 - 22:46
Leica 39mm - K mount adapter. Does it exist?
You can fit a 39mm lens on a K body by using a K to M42 adapter and an M42-M39 ring. Bit of a faff, but cheap: I just got an M39-M42 ring from the Ukraine for 99 cents (plus postage). It's not very well made, though, so you might not want to put it on your expensive Leica lenses. SRB do one for £16....
Posted by Anonymous on 19/10/2005 - 13:18
Leica 39mm - K mount adapter. Does it exist?
you can use any LTM lens using an LTM-M42 plus an M42-K adapter BUT only in extreme close focus area. Remeber the backfocus of Leica LTM/M mount is about 1/3 smaller than M42/ K-mount SLR due to smaller camera width (no need for a mirror). So with a C/V 15mm your focussing would be probably 2-22mm,...
Posted by Sonnar2 on 19/10/2005 - 17:00
Leica 39mm - K mount adapter. Does it exist?
Thank you for these replies, which provide food for thought. I would not normally stray from Pentax, but as they do not sell any wide-angle at this focal length, and do not propose to at anywhere near the price of the Voigtlander, I thought I would consider the matter. The mirror problem is re...
Posted by George Lazarette on 20/10/2005 - 00:02
Leica 39mm - K mount adapter. Does it exist?
George, a 12mm moves *very little* when focus is shifted from infinity to 0,2m - just fractions of milimeters. If "infinity focussing is not necessary due to large DOF" it would be much simpler to design ultra-wideangle-lenses for SLRs than it actually is. They would look similar, ins size and costs...
Posted by Sonnar2 on 20/10/2005 - 08:23
Leica 39mm - K mount adapter. Does it exist?
DOF relies on us being able to tolerate an image being slightly out of focus and not being able to tell the differnce. This is, of course, the "circle of confusion", the disc that the human eye cannot distinguish from a point. In fact, a lens is only properly in focus at the distance it is focus...
Posted by johnriley on 20/10/2005 - 09:09
