Search results for 'back focus' - page 1000
Vivitar 135mm f2.8 - Komine Made
To be honest I don't think there are many bad primes out there of any focal length (I know of an M42-fit Zeiss badged 50mm which is best avoided). Zooms are harder to design due to the inherent compromises, but most primes use designs dating back decades. If you can buy the Vivitar cheaply then ...
Posted by Dangermouse on 18/09/2011 - 23:34
Now what am I doing wrong?
Put it in M on the dial. Choose your aperture e.g. f8 on the lens. Focus press the green button Listen to the whizz burr as the camera stops the aperture down and check the exposure and then sets the shutter speed. Then press the shutter button.
Posted by dougf8 on 18/09/2011 - 18:06
Now what am I doing wrong?
Put it in M on the dial. Choose your aperture e.g. f8 on the lens. Focus press the green button Listen to the whizz burr as the camera stops the aperture down and check the exposure and then sets the shutter speed. Then press the shutter button. what he said works on the k-r
Posted by geordie01 on 18/09/2011 - 21:49
Now what am I doing wrong?
I'm enjoying the Vivitar 55mm macro on the front of a K-5 at the moment. All manual and iq is excellent. I'm getting a bit faster at the controls. Focus, expose, refocus and shoot and the stop down meeting seems accurate. It's less of a bother with an A lens, of course.
Posted by dougf8 on 19/09/2011 - 06:27
Now what am I doing wrong?
Thanks guys I think collectively you've answered all my current queries. I spent many years with a manual/clockwork camera back in the 60's/70's and was perfectly happy to "guess" my exposure requirements. Pleased to say I got a fair number within a reasonable tolerance for printing (albeit 5x7 wit...
Posted by Frogherder on 19/09/2011 - 11:01
Now what am I doing wrong?
Even the film cameras didn't always meter correctly with all lenses :shock: The link I gave above was from 2009.... This is more recent with a graph of a K-7 as well. I use an Expodisk and set the WB off it 1st using the sky then a shot at each aperture using Av if possible, Manual (Green Bu...
Posted by Algernon on 26/09/2011 - 11:55
Cosina 100mm f3.5 manual focus adaptor?
Hi all I have just purchased this lens second hand and was hoping it would come with the screw in adaptor that makes it a 1:1 macro but it didn't so I was wondering if anyone knows where I might be able to get one? Or does anyone know of something that I can buy that will work the same? Its not th...
Posted by bigdaddybucks on 19/09/2011 - 13:34
Cosina 100mm f3.5 manual focus adaptor?
Is it a K mount or an M42 screw mount? What you need is normally called an extension tube - it fits between camera and lens to allow much closer focusing. They usually come in sets of three pieces which you use in different combinations to vary the length of the tube.
Posted by Dangermouse on 19/09/2011 - 14:41
Cosina 100mm f3.5 manual focus adaptor?
Hi, this lens apparently originally came with an adaptor that screwed into the filter thread to change the macro from 1:2 to 1:1 and was matched to the lens. I could try using an extension tube but would rather try and source the adaptor also I do not know what length extension tube would make it 1:...
Posted by bigdaddybucks on 19/09/2011 - 14:54
Cosina 100mm f3.5 manual focus adaptor?
Ahh Look at close-up lenses/filters. You'll need to find the correct size but it's probably your best bet. I doubt you'll find the adapter for sale on its own, in my experience things like this either come with the lens or become a lengthy quest to track down.
Posted by Dangermouse on 19/09/2011 - 16:08
Cosina 100mm f3.5 manual focus adaptor?
I've being doing a bit of internet pottering recently and have bought a couple of achromatic macro/close up lenses to stick on "standard" non-macro lenses. Also I was looking at a similar 1:2 lens and read (but can't find the reference yet) that the 1:1 adapter is a +3 dioptre lens. However tr...
Posted by dougf8 on 19/09/2011 - 19:02
Cosina 100mm f3.5 manual focus adaptor?
Ahh Look at close-up lenses/filters. You'll need to find the correct size but it's probably your best bet. I doubt you'll find the adapter for sale on its own, in my experience things like this either come with the lens or become a lengthy quest to track down. Unlike extension tubes, with close u...
Posted by petrochemist on 19/09/2011 - 19:17
Cosina 100mm f3.5 manual focus adaptor?
Oh yes remembered this rough comp, the 58mm is not a macro lens but https://www.pentaxuser.com/forum/topic/vivitar-55mm--nokton-58mm--macro-filter--sigma-105mm--rough-comparison-29690 I'll do this again more cleanly with the +5 Marumi when I have a bit of time.
Posted by dougf8 on 19/09/2011 - 19:28
Fixed or zoom?
If you want something with a shorter focal length and less weight than the 50-135mm (and I must admit that lens is certainly on the bulky side) the I would probably go for the Pentax 17-70mm. Unfortunately the 2 I tried both had focus problems between 50-70mm and I didn't like the "workaround".
Posted by Mike-P on 20/09/2011 - 18:53
SMC FA 28mm F3.8 - 200mm F5.6 AL (IF)
Thanks for this info - I was after the manual as I was intrigued by the macro marker on the focus ring. You guys got any thoughts on it?
Posted by AndrewA on 20/09/2011 - 09:15
SMC FA 28mm F3.8 - 200mm F5.6 AL (IF)
Thanks for this info - I was after the manual as I was intrigued by the macro marker on the focus ring. You guys got any thoughts on it? Just guessing here but some macro zoom lenses will only go to the 'macro' range at either one setting or a limited range of settings. The SMC-F 35-70 for example...
Posted by womble on 20/09/2011 - 10:56
SMC FA 28mm F3.8 - 200mm F5.6 AL (IF)
My guess is that the focus ring won't go into the macro range at all focal lengths. That was my guess, too, but it's wrong :D There's no change in focus throw between the extremes of the zoom range. The closest focusing distance marked on the barrel is 2.1m, with a green line leading to the ...
Posted by ChrisA on 20/09/2011 - 11:02
SMC FA 28mm F3.8 - 200mm F5.6 AL (IF)
I'm wondering if it might be more "close focus" than true macro? I have a few Pentax zooms with this, but they all seem to go no closer than about 0.4m despite the macro symbol. Best bet is probably to find a suitable test subject and see how close you can get before the lens is unable to foc...
Posted by Dangermouse on 20/09/2011 - 11:03
SMC FA 28mm F3.8 - 200mm F5.6 AL (IF)
My guess is that the focus ring won't go into the macro range at all focal lengths. That was my guess, too, but it's wrong :D There's no change in focus throw between the extremes of the zoom range. The closest focusing distance marked on the barrel is 2.1m, with a green line leading to the ...
Posted by womble on 20/09/2011 - 11:13
SMC FA 28mm F3.8 - 200mm F5.6 AL (IF)
It appears to have a very short focus throw so I am guessing manual focus will be a PITA. Incredibly short. Much shorter than anything else I've seen. About an inch or perhaps a shade more. Makes AF pretty quick though. Haven't had it on the K-5 yet, but I've always enjoyed it on the K10.
Posted by ChrisA on 20/09/2011 - 12:25
