Search results for 'back focus' - page 749
Pentax FA 50 f1.7 at ffordes
"About" the same size ain't exactly the same size ;) http://www.bdimitrov.de/kmp/lenses/primes/normal/index.html : FA 1.4: 63x37mm, 220g FA 1.7: 63x31mm, 170g ... But in this case I think bdimitrov is wrong. Mine are both 64mm dia x 37.5mm back plate to front at infinity and 45.2mm at the othe...
Posted by shim on 07/02/2009 - 17:20
Pentax FA 50 f1.7 at ffordes
The 1.7 is a bit smaller and lighter than the 1.4 as well. £99 is a fair price considering the rarity. They'd get even more if they put it on eBay! Hmmm! I've got a FA 1.4 and an F 1.7 right here in front of me and they look about the same size. The AP test report (1991) says they weigh 235g and ...
Posted by smc on 08/02/2009 - 21:21
Pentax FA 50 f1.7 at ffordes
Just wanted to thank Galoot for pointing this out, the lens will be with me in the morning! :mrgreen: I've been looking for one for ages, I rang up yesterday and someone had reserved it but they rang me back this morning to say it hadn't been purchased. Thanks! Si
Posted by DarknFuzzy on 10/02/2009 - 10:02
tamron 70-300mm or sigma apo version or pentax 55-300mm
Scott, I've used all three in varying degrees. Used the Sigma on a Nikon D50, Tamron on a Sony A100 and the Pentax I have only just got so can't comment on it's performance yet. But my initial feelings on these are as follows: Tamron - Pretty similar in many ways to Sigma except cheaper to...
Posted by ianjohnson67 on 07/02/2009 - 21:19
1.4x or 2x Teleconverter
I Have tried quite a few Tc's The one i have settled on, is the Kenco 1.4 dg from SRS and at £89 inc postage for members of the forum not bad I do have a shot taken with it on the camera in my gallery if you want to look.:shock: If it's the Pz-AF version you talking about, this converter was discu...
Posted by bforbes on 08/02/2009 - 12:35
1.4x or 2x Teleconverter
I Have tried quite a few Tc's The one i have settled on, is the Kenco 1.4 dg from SRS and at £89 inc postage for members of the forum not bad I do have a shot taken with it on the camera in my gallery if you want to look.:shock: If it's the Pz-AF version you talking about, this converter was discu...
Posted by loskeran on 08/02/2009 - 12:55
1.4x or 2x Teleconverter
I bought a promaster spectrum 7 1.7x teleconverter which works with every lens I have attached to it, it has SDM contacts and powers my Sigma 50-150mm HSM very well and also has a screw AF drive pass through - so all my lenses have auto focus when attached to it. I ordered it from a fleabay store...
Posted by isdky on 09/02/2009 - 12:49
1.4x or 2x Teleconverter
I Have tried quite a few Tc's The one i have settled on, is the Kenco 1.4 dg from SRS and at £89 inc postage for members of the forum not bad I do have a shot taken with it on the camera in my gallery if you want to look.:shock: If it's the Pz-AF version you talking about, this converter was discu...
Posted by jeallen01 on 12/02/2009 - 19:54
Mk II Kit Lens
Here's a picture taken with the SMC Pentax-DA 18-55mm II lens, which hopefully will reassure some of us that this lens is actually pretty good: I find this lens very useful for pictures of items for eBay because of its close focusing and also the quick shift. I use AF for these images, but tweak...
Posted by johnriley on 08/02/2009 - 11:12
Mk II Kit Lens
I know it can't really be compared with the MkI version that I had, but I grew to really dislike my kits lens. It just didn't feel nice to use. I ended up selling it with the K100D body. It was sharp and contrasty and performed flawlessly, but it just lacked something, which I can't really put my fi...
Posted by GrahamNR17 on 08/02/2009 - 16:47
Prime lens focussing problems
Hi, I have bought a 50 mm f1.7 Pentax manual prime for the shallow depth of field. I am problems focussing with any consistency, in fact I get better results through the bottom of a milk bottle. I have the same problem with another manual prime (Chinon 50 mm ). I have done all the tests, Newspaper o...
Posted by Miniman on 08/02/2009 - 17:05
Prime lens focussing problems
Hi The smaller and darker viewfinder of a DSLR can make manual focussing harder than what you are used to with a 35mm camera. A couple of points first, f22 wont give you the sharpest image because you will be suffering from diffraction. f5.6-f8 is generally where lenses are sharpest. But to pi...
Posted by pschlute on 08/02/2009 - 17:24
Prime lens focussing problems
I do get some sharp images, but it only seems to be in any one session. I mean 1st session okay, change for another lens, replace for 2nd session and the results awful..Soft is not the word, we are talking well out of focus. If I set up the lens to f22 and focus on an object 25 feet away, everything...
Posted by Miniman on 08/02/2009 - 17:32
Prime lens focussing problems
Ok , so we are talking about seriously mushy , not just missing focus by a smidgin. If it was 100% off I would say bin the lenses, but the fact that it works sometimes and not others is very odd. Are you using shake reduction? and are you correctly telling the camera the correct focal length ...
Posted by pschlute on 08/02/2009 - 17:41
Prime lens focussing problems
Hi, When focusing manualy are you using the green hexagon as a focus confirm or just when it looks OK through the view finder? If the latter then it may be that you have not got the diopter setting for the eyepiece set correctly leading you to believe that it is in focus when its not. Alter...
Posted by Bob and his Pentax on 08/02/2009 - 17:42
Prime lens focussing problems
Both at f5.6 with flash, 100% crops, best of several focus attempts on K20D, JPEGs (Natural with medium sharpening), no post processing: Pentax-A 50mm f1.7: Pentax-DA 18-55mm II at 50mm: Just a quick rough test - that proves nothing except that it's possible to get the old MF prime in...
Posted by iceblinker on 08/02/2009 - 19:01
Prime lens focussing problems
Tsk Kris ye of little faith the bayonet bit was added as an edit after the reminder from Mannesty! Pity they weren't screw fit then we could blame the converter! Mike Opps :oops: I forget that we can edit our posts. Sorry Peter :!: I had guessed the line we were going down was a dodgy co...
Posted by womble on 08/02/2009 - 20:57
Prime lens focussing problems
I wonder if this is related to the old front/back focusing chestnut? Presumably the hexagon is part of the AF system even if it is being used to help focus an old manual lens? That's right and why it's worth experimenting to find what actually works best.
Posted by iceblinker on 08/02/2009 - 21:43
Prime lens focussing problems
Sounds like a katz-eye (or equivalent) split screen focus screen is the way to go.
Posted by womble on 08/02/2009 - 22:56
Prime lens focussing problems
How far out would you guess it to be? Measuring from the front of the lens would make that measurement out to the tune of the lens length plus flange-to-sensor distance. Unless things have changed, the scale on the lens is the subject-to-film distance? Hi, this may be true, but given that the tests ...
Posted by Miniman on 09/02/2009 - 19:36
