Search results for 'back focus' - page 2092
High Power, pulsed laser inhibition of fungus in ocular instruments
Anyhoo, The sun was out so I got a magnifying glass and focused its rays on the bit of fungus I've found in my Vivitar 135 CF. The elements show where the focus point is as they are not 100% clear. I can see a sort of splodge spread stain round the threads where the fungus effects are spreading...
Posted by dougf8 on 05/04/2013 - 11:52
Feasibility mount swap MF question
Ohhhh sage forum of wise and good knowledged folk ..... I have a Vivitar 135mm CF lens with a splodge of fungus. Is it within the bounds of reason to pick up an unfashionable mount (e.g. olympus) version of the Vivitar 90mm Macro (or one of the plethora of lookee likes) and traansplant the mou...
Posted by dougf8 on 05/04/2013 - 21:34
ND Filter Help
So my question is where do I come by these big stopper filters than can give me loooong exposures of 30 - 60 seconds. I don't want to spend big money. Unfortunately you may have to. A quality 10 stop ND filter will set you back about £100.00. Welding glass, which is actually 12-14 stops, will ...
Posted by Mannesty on 15/04/2013 - 08:19
ND Filter Help
I bought a 52MM HAIDA Pro ND3.0 1000x off Fleabay a few months back for just over £25. I've only taken a couple of shots with it so far - definitely a 10 stopper. Possibly a *little* blue cast, otherwise looks fine. Andrew
Posted by andrewk on 15/04/2013 - 08:57
ND Filter Help
Back to the subject of 10 stop filters, I have the Hitech 10 stopper that costs around £60. It does produce a blue cast, but as mentioned in this thread I can confirm this is easy to remove, either in post processing or by setting a custom white balance in camera (I tend to go down the post process...
Posted by davidstorm on 16/04/2013 - 22:55
ND Filter Help
Stick a welding glass to a filter is an option, better if you can somehow make it a sliding fit into some sort of carrier. With the welding glass/10 stopper in place in front of the lens you'll see nothing through and will therefore need to focus your scene before fitting it.
Posted by Mannesty on 21/04/2013 - 21:45
Using battery grip on the K10 D
Thanks for the feed back everyone most apreciated. Ian
Posted by philstaff on 19/04/2013 - 16:22
SD card problems
Hi Annie Secondly and I know it sounds mad - but I once had a similar issue with a sandisc card and in desperation I slid the lock button fully each way a couple of times and tried it again - can not think of any reason how or why it would work but it did! Carl Just thinking on similar lines -...
Posted by Gamka on 23/04/2013 - 14:56
SD card problems
I had problems with some SD cards a while back and found that it was the reader and not the card, throu this forum, I was advised to use a reader designed for the card and not a 10 in 1 type, since then, all's been fine.
Posted by Chrism8 on 23/04/2013 - 16:53
Auto focus grinding!?! Sigma 70-300 on a k5ii
Recently I have noticed that sometimes my sigma 70-300 fails to autofocus on my k-5ii (displaying f-). It generally doesn't want to do it, then, when it does work, it will work for a short period of time then it will make a horrible grinding noise. I'm scared it will knacker my body. Is there anythi...
Posted by Pjwebbs on 24/04/2013 - 12:13
Auto focus grinding!?! Sigma 70-300 on a k5ii
You could try cleaning the contacts with a soft dry cloth, on camera mount and lens mount. The make sure the lens seats properly and is locked in to place. The F-- is telling to that the camera is not reading the lens. Is any aperture ring on the lens firmly clicked into the "A" position?
Posted by johnriley on 24/04/2013 - 12:35
How duff is this DA* 50-135mm?
I bought a used DA*50-135mm recently off eBay. Cosmetically it looks in great condition and came well packed with all the bits. I tried it out with my K-5 in the garden on some flowers and was impressed by the depth of colour and out of focus bokeh. However, I felt the shots weren't very sharp ...
Posted by WaypointCharlie on 24/04/2013 - 15:20
How duff is this DA* 50-135mm?
I have been through a recent set of images and pulled out some taken with 50-135 but only one is at f2.8. My camera does NOT have any focus correction - it may need a little. These are the JPGs straight out of the camera. I have been through a few recent shots and found some taken with the 5...
Posted by Gamka on 24/04/2013 - 18:10
How duff is this DA* 50-135mm?
If you are unhappy with it and purchased it within the last 14 days, why not ask the seller to take it back? It seems to me that the E Bay system is set up much more these days to protect the buyer's interests.
Posted by Blincodave on 24/04/2013 - 22:07
How duff is this DA* 50-135mm?
Thanks guys for your comments. I've done some more tests and it's blindingly obvious on real world shots that the Phase Difference AF back focusses (prior to adjustment). Contrast AF seems to work fine in Live View. With an adjustment of around +8 to +10 the Phase Difference AF closely matches ...
Posted by WaypointCharlie on 25/04/2013 - 12:01
Pentax Sigma 400mm mounting
Avoid this one like the plague. Clearly the shop in question haven't got a clue. If an adapter exists you will lose auto focus - it's not worth the hassle in my honest opinion.
Posted by Snootchies on 26/04/2013 - 00:21
Pentax Sigma 400mm mounting
Avoid this one like the plague. Clearly the shop in question haven't got a clue. If an adapter exists you will lose auto focus - it's not worth the hassle in my honest opinion. In a local Cashconverters recently and they had a Sigma zoom labled as a Canon lens :D (same shop I got the Vivitar macro l...
Posted by jeallen01 on 27/04/2013 - 11:14
Whats wrong with this lens?
Well I'm surprised that you can't see what's wrong with it, it's plainly obvious . . . . . . nothing. :lol: May we know which lens it is? It may be one that has known issues that somebody might no of. Is it maybe a zoom that suffers from barrel creep, that is, it changes focus ...
Posted by Mannesty on 28/04/2013 - 14:53
Whats wrong with this lens?
If it doesn't show barrel creep then I suspect the problen is with the prvious user. Though it could be a back/front focusing issue with their particular camera. Certainly looks like you got a bargain.:)
Posted by petrochemist on 28/04/2013 - 15:08
Whats wrong with this lens?
Well I'm surprised that you can't see what's wrong with it, it's plainly obvious . . . . . . nothing. :lol: May we know which lens it is? It may be one that has known issues that somebody might no of. Is it maybe a zoom that suffers from barrel creep, that is, it changes focus wh...
Posted by Renster on 28/04/2013 - 16:01
