Search results for 'sensor cleaning' - page 92
Metering with 1.7X converter
[quote:9462b30f58="ChrisA"][quote:9462b30f58="mille19"]I have also noticed that in AV mode I can set the F to F2.8 but the lens is only a F4 if I take a shot at F2.8 the shots come out over exposed. Has anyone else had the same problems and has anyone any ideas why this could be happening? I've h...
Posted by George Lazarette on 15/07/2007 - 12:58
Metering with 1.7X converter
What do you think I should do George? I thought I might try cleaning the contacts. ;) Now there is a novel idea! But does the Jessops TC have contacts? More than you could shake a stick at. I was thinking, maybe a brillo pad.
Posted by ChrisA on 15/07/2007 - 14:24
Fungus in Lenses
Good morning Would these lenses be worth bidding on if the price was right (they all have fungus) I assume its not an easy task cleaning these or he would have cleaned them himself. I have never dismantled a lens before but if its not too difficult i would be willing to give it a try and re-se...
Posted by Clarky on 02/08/2007 - 12:30
DA 50-200 Problems
Especially for close objects, are you sure it is back focusing, or is it possible that the focus sensor is simply off from where you think it should be? If you assume the focus is on center, but is actually 5%-10% or further down the frame, this can cause a huge problem when you're not aware of i...
Posted by amoringello on 03/08/2007 - 12:19
Lens for indoor sports
The K10Ds 10MP sensor really comes in handy in indoor sports. you can afford to use a shorter, faster lens and crop a bit tighter. My most used lens for indoor sport is my Tamron 90mm F2.5 macro, but then most of my indoor sport is fencing and I can get pretty close in.
Posted by Mongoose on 03/08/2007 - 16:20
Reverse mounting for MACRO
A set of three extension tubes would give you approximately 1:1 magnification with a 50mm lens, but with the result that your subject will be about 25mm from the front of the lens. That's how I took this: It was about 4mm across including legs, and occupied half the original frame width. ...
Posted by ChrisA on 05/08/2007 - 14:51
Reverse mounting for MACRO
It was about 4mm across including legs, and occupied half the original frame width. If the sensor is 24mm wide, that makes the image 12mm wide, so I think that's more like 3:1 than 1:1. Or have I misunderstood how to calculate the magnification? I think you've got it right.
Posted by Tyr on 05/08/2007 - 15:09
Reverse mounting for MACRO
It was about 4mm across including legs, and occupied half the original frame width. If the sensor is 24mm wide, that makes the image 12mm wide, so I think that's more like 3:1 than 1:1. Or have I misunderstood how to calculate the magnification? No, that would be correct, if the spider was 4mm a...
Posted by Daniel Bridge on 05/08/2007 - 20:19
Lens Hood for SMC FA 50mm F 1,4
Hello All, I just ordered a brand new FA 50mm f 1,4 lens :D The lens comes without a lens hood. So I also bought a rubber lens hood, but I don't think that is an optimal solution. Do you know of a lens hood that would be more suitable for this lens? Am I correct in the asumption that I cou...
Posted by drerka on 07/08/2007 - 07:56
Sigma 170-500mm F5-6.3 APO
Do both lenses have a conversion factor of about 1.5 with the K10? Yes, crop factor is a result of the sensor size. The lens has no effect on that aspect of the final image. Lenses for full frame sensors simply create a larger image circle, of which a smaller portion is usable by the camera. ...
Posted by amoringello on 14/08/2007 - 16:57
Tamron 90mm F2.8 Macro Lenses
Apparently, the Di lens "weighs 15 grams less and is 2.5mm shorter than the previous model." :D Not sure that's a good reason for an extra £30 though. Generally the difference between 'digital' lenses and previous models is: 1) Special coatings on the rear element to absorb any ref...
Posted by Daniel Bridge on 17/08/2007 - 11:50
Switch lens or switch camera
Hi "niblue" Re your point: It wouldn't surprise me at all if these lenses outperform the Pentax 18-55 where there range overlaps I was unsurprisingly offered the usual K10D + 18-55mm 'kit lens' at the time of purchase, but rejected the 'kit-lens' part of the equation for the obvious ...
Posted by Helterskelter on 23/08/2007 - 22:17
Standard lens or f/2.8 zoom?
I've never even seen one of those Tamron 28-75's but I did have a Tokina 28-70 F2.6-2.8 until fairly recently. It was an excellent lens but even with film I never found I'd use it all that much because in practice I never really found 28mm wide enough. As that got worse with the APS-C sensor DSLR's ...
Posted by niblue on 23/08/2007 - 18:17
Tamron sp AF 90mm 2.5 Macro
Extension tubes, to the best of my knowledge only come in sets of three, lengths do vary slightly from make to make, individual tubes are probably available but will no doubt be costly, my set are Jessops own brand "KA" mount tubes 13, 21 and 31mm. there is nothing to stop you using any co...
Posted by fatspider on 26/08/2007 - 14:07
"Upgrade" at zero cost!
It can be useful if you're shooting a series of pics with an off-centre subject - you select the focus point which corresponds with the subject you want to focus on, compose the picture as you want it and then fire away. Yes, you can keep focusing with the centre sensor, then recompose, but if yo...
Posted by Daniel Bridge on 01/09/2007 - 23:07
"Upgrade" at zero cost!
I prefer to keep my "protective" filters in place, not so much because I'm worried about knocking the front element but more for ease of cleaning, I would sooner be constantly cleaning a filter than the lens, plus out in the field I have no problems if I find myself having to clean the fro...
Posted by fatspider on 02/09/2007 - 11:13
"Upgrade" at zero cost!
I've actually seen a strange problem where a UV filter causes the green channel to clip on the S20Pro. It may be coincidence but, it seems to happen only with the filter on. The sensor has a huge dynamic range but that seems to vanish.
Posted by Tyr on 02/09/2007 - 12:04
SMC-FA 80-320 diagram
Tried to get Pentax UK to give me a diagram... gave up in the end :roll: Had a little time this morning, as well as a small brainwave about how the lens fits together... and managed to repair the 80-320mm :D Hint: underneath the rubber focus ring are three screws that remove a collar. Undernea...
Posted by MattMatic on 24/10/2007 - 21:45
SMC-FA 80-320 diagram
Matt, If you want to do the images, I can convert to pdf and put it on the repairs page of my website. As far as the fungus and etching is concerned, it would appear that it is only a couple of strains which produce the acid. They don't feed on the coatings as such but the acid actually dissolv...
Posted by Kim C on 25/10/2007 - 16:07
SMC-FA 80-320 diagram
Kim, To do complete images, I'd have to take it apart again... which isn't a big deal ;) I used some CCD cleaning fluid as my Eclipse fluid wasn't at home at the time. Needed a nice soft cloth (used a Lee filter cloth) and it polished up very nicely indeed. In fact, when assembled there's absolu...
Posted by MattMatic on 25/10/2007 - 17:13
