Search results for 'sensor cleaning' - page 105
Dumb question of the day
Another question sort of leading on from this one - If Petal hoods are optimised for shooting with the large petals top and bottom and the small petals left and right, why is it only possible to mount the hood so it is optimised for landscape orientation, not portrait operation (on all my lenses ...
Posted by Mannesty on 19/05/2009 - 21:24
Dumb question of the day
Another question sort of leading on from this one - If Petal hoods are optimised for shooting with the large petals top and bottom and the small petals left and right, why is it only possible to mount the hood so it is optimised for landscape orientation, not portrait operation (on all my lenses ...
Posted by Oggy on 19/05/2009 - 21:32
Dumb question of the day
Ideally, hoods for telephoto lenses would be petal shaped too, but I suppose the advantage is too slight to bother with when the hood can be so deep without it. EDIT: Also often you wouldn't want the hood any longer than a round one. Come on Oggy, keep up, what shape is your film/sensor when c...
Posted by iceblinker on 19/05/2009 - 21:35
Pentax M42 4/17mm Fish-Eye on flea-bay
I have the K-mount version of this lens. Lovely bit of engineering with the dial-in filters. However as has been pointed out it is not much of a fisheye on the crop sensor, and because you cant use a hood it tends to produce flat images when the sun is out.
Posted by pschlute on 21/05/2009 - 14:07
F.O.A. Scottthehat; Focus tests as requested.
The last shots look "woeful" because it appears you have a quite bad front focussing issue. You will not see this in an image of a flat subject that is parallel with the sensor's focal plane. It's obvious in the shots of the chart though. Yes, any adjustment for focus issues at one end of the zoo...
Posted by Mannesty on 23/05/2009 - 06:08
F.O.A. Scottthehat; Focus tests as requested.
The last shots look "woeful" because it appears you have a quite bad front focussing issue. You will not see this in an image of a flat subject that is parallel with the sensor's focal plane. It's obvious in the shots of the chart though. Yes, any adjustment for focus issues at one end of the zoo...
Posted by CraigF1969 on 23/05/2009 - 09:02
F.A.O. Shim
Hi Craig, sorry I've been out and only just got back. The one at -10 above looks OK. I use a K10D so I'm not sure about the K20D adjustments, but I understand that you can set one for each lens, so I would set that one to -10. It's very often the lenses that cause this adjustment to be necessary ...
Posted by shim on 23/05/2009 - 18:57
F.A.O. Shim
It's probably worth recapping at this point just to ensure you have your camera set correctly before attempting these adjustments. First, print charts and read the author's , cut out the first 2 and fold them as shown. Set them on a flat surface. Your camera needs to be set as follows:- 1...
Posted by Mannesty on 23/05/2009 - 19:20
DAs Versus Kit
[quote:3496ace15f="lemmy"]I am beginning to lose the will to live here! I am satisfied that the focus is not out. Both the kit lens at 35mm and the DA at 35mm were on auto-focus for these shots. If one is out, would the other not be? The phase detection focus unit is in the body, after all, not i...
Posted by nathanever82 on 26/05/2009 - 18:27
DAs Versus Kit
I'm sorry to upset you Nathan. I'll take the pictures down if you wish, no problem. Shim, the picture was taken on a tripod, mirror up dekayed action at 1/1500th or so and fired with the Pentax remote. So Greytop, what you're saying is that my camera focusses correctly with the kit lens but no...
Posted by lemmy on 27/05/2009 - 14:27
DAs Versus Kit
Lemmy, I am not upset by your pictures, I am upset by your mis-understanding of what i've been trying to explain to you. FIrst of all, cameras like the K20 have INDIVIDUAL FOCUS ADJUSTMENT FOR EACH LENS. And therefore, yes, as you say, "it is reasonable to expect a photographer to do this"!!! ...
Posted by nathanever82 on 27/05/2009 - 14:48
DAs Versus Kit
Leicas don't have a pentaprism Lemmy, they have a rangefinders. In any DSLR or SLR with a pentaprism, what you see in the viewfinder whilst focusing, is the image reflected from the mirrors IN FRONT of the sensor. Therefore there can be a discrepancy between what you see in the viewfinder (or wh...
Posted by nathanever82 on 27/05/2009 - 19:12
Lens Price Increases!
i.e. Sell 1000 units at -10% profit, result, a £10,000 loss. Or sell 200 units at 15% profit, result, a £3000 profit. Okay, less unit sales means increased overheads per unit, so reduce overheads/manufacturing capability to suit demand. The maths is fairly straightforward. Unfortunately you h...
Posted by Shaky on 04/06/2009 - 11:41
Lens Price Increases!
Personally I think it's all just an excuse to put up prices, Vietnam and probably the Philippines are cheap manufacturing countries. I Haven't heard of any Japanese car manufacturers putting up their prices by 25-50%. Shim, UK car plants belonging to Japanese manufacturers make cars; that is they ma...
Posted by Shaky on 04/06/2009 - 15:26
How do yuo do it! Manual 50mm question
If you are focusing very close, you might get back or front focusing. I have it in ALL my MF lenses :( How can that be? Perhaps your dioptre is not adjusted correctly? My understanding is that back/front focussing only affects AF lenses and AF focussing. Any lens focussed manually should repro...
Posted by Mannesty on 05/06/2009 - 10:54
50mm
The FA was designed for film cameras , so full frame and has an aperture ring and screwdrive focus. And a third to half the price of the new one! The DA was designed for digital so has no aperture ring and has a SDM focus motor . As Pentax use an APSC size sensor ( smaller than full frame) the digi...
Posted by MarkD on 07/06/2009 - 08:18
USM and DA* 50-135mm
The USM motor on my DA* 50-135mm appears to have died. Has this happened to anyone else? I guess I'll have to send it off to Pentax for repair. That will probably be painful... Although I love the images on this lens the fact that part of the lenshood attachment snapped off and now the motor has...
Posted by Lance B on 24/08/2009 - 03:43
TAMRON 28-200mm xr di
Greynolds - I also started off with a bridge (Fuji 9600). This is a good camera, but at the end of the day it's a glorified compact because you can't get around the sensor side. So all the stuff we like doing with dof etc. just doesn't happen. And noise! And evf...etc....etc...
Posted by TonyM on 18/06/2009 - 14:18
Macro experimentation pointers
Well the package arrived last night, and i must say i'm chuffed to bits. All lenses as described and in very good condition, a quick check shows all operating correctly, though was v.busy so have yet to fit to the body and start playing (tonight I expect :)). Also in the case, unlisted, was a good...
Posted by Telstar on 23/06/2009 - 13:48
Macro experimentation pointers
For cleaning thick dust off a lens use a good quality brush (pop down to your nearest art supplier and get a thick sable one) followed by a blow with a rocket blower or similar. If there are stubborn marks then a cotton bud soaked in lighter fluid should do the trick - don't be tempted to use water!...
Posted by hefty1 on 23/06/2009 - 15:39
