Search results for 'sensor cleaning' - page 170
Super taumar polarising filter
I couldn't agree more about a hood. With=fantastic; without=frequently washed out. Also you can use deeper hoods with cropped sensor cameras which would almost certainly result in vignetting on a full frame job. On my (already deeply recessed) 50mm macro lenses I always use a Takumar style 49mm me...
Posted by davidwozhere on 22/01/2018 - 01:19
Focus adjustment
Ricehigh has a good method. Sadly Photobucket have messed up the photos in the article, but the text is there.... http://ricehigh.blogspot.com/2012/01/focus-adjust-k-5-and-pentax-af-lenses.html Be careful focussing at 45deg the spot focus can move about a bit. that can be folded vertical is ...
Posted by Algernon on 13/02/2018 - 10:28
Favourite Lens?
Difficult question for a lens polygamist. The lenses I use most are DA 16-85mm on APS-C and D FA 28-105mm on FF because of the combination of their range and light weight( for zoom lenses). However, if I had to choose just one lens, it would be the DA* 55mm F1.4 which works nicely on both s...
Posted by ronniemac on 24/02/2018 - 12:06
SMC-A 50mm f1.7 - a 'problem' and a question.
The problem is easily solved - I can focus on the K10D screen easily (I started out with a Zenit 3m - plain screens don't scare me :wink:). Unfortunately, depending on whether I am wearing my glasses, which pair (reading or distance) and how the correction dioptre thingy is set, what I see as in foc...
Posted by Aitch53 on 01/06/2018 - 12:02
Pentax 1.4x converter on K1
Because the DA1.4x is designed for a Crop sensor you will get some vignette on images from the K-1 if used in full frame mode. You will of course have the opportunity to crop in post process or Use the K-1 in crop mode.
Posted by bforbes on 05/07/2018 - 15:57
Sigma 150-600mm f5-6.3 Contemporary DG OS HSM Lens - Canon Fit
You've got a K3 ..... Do you know how much of a crop you can do with that sensor and not have any significant loss at the output sizes you use? ..... Do you really need 600mm...?
Posted by McGregNi on 19/07/2018 - 21:46
Sigma 150-600mm f5-6.3 Contemporary DG OS HSM Lens - Canon Fit
You've got a K3 ..... Do you know how much of a crop you can do with that sensor and not have any significant loss at the output sizes you use? ..... Do you really need 600mm...? As you know, the time comes along when you just dream of a new lens. Birds in flight and sports now seem to be the way fo...
Posted by balsembi on 19/07/2018 - 23:53
Sigma 150-600mm f5-6.3 Contemporary DG OS HSM Lens - Canon Fit
I have seen it written before that we should firstly choose the lenses we need, or want .... And then buy a camera that they go onto! That seems to be the way this thread has gone. It's probably an approach more suited to professionals I feel ......as an enthusiast I find it hard to break away fr...
Posted by McGregNi on 20/07/2018 - 17:06
Tamron SP 90 macro or Pentax 100 WR macro
I've used both and currently have the DFA100WR. The Tamron purple fringes a lot more than the Pentax. The Pentax is smaller, lighter and WR. Pentas has quick-shift focus. The Pentax is basically a Limited in all but name, on of the best built lenses I've ever seen. The Tamron is cheaper and has a...
Posted by Tyr on 01/08/2018 - 17:11
Tamron SP 90 macro or Pentax 100 WR macro
I assume there must be some lens quality control issues with the last 2 posts, where purple fringing comes up as a problem on both and neither....:shock: Thanks for the feedback. Just a note to say, that I did try and make it clear that the working distance was taken from the front of the lens no...
Posted by walt on 01/08/2018 - 18:01
IR focus register marks
Can't see why not - the sensor is still in the same place as the film used to be i.e. the focal plane.
Posted by tigershoot on 26/07/2018 - 18:27
If you could only have one Limited prime lens (inc. the 20-40).......
Reading several of your comments above, I wonder why the 16-85 is suggested at all - although it is a fine lens, it is quite a big bulky beast. Staying with zooms, perhaps the 18-135 would be the most versatile option. It is fairly compact and light for its range (a good range for both indoor ...
Posted by MrB on 26/08/2018 - 10:23
If you could only have one Limited prime lens (inc. the 20-40).......
I have them all except the 35mm. Of the ones that I have experience of I feel the DA 21mm might best meet your requirements. The 40mm is a fine lens but a bit limiting on APS-C as a one lens solution. The 20-40 gives good results with very small zoom extension. However it is not nearly as compact as...
Posted by smudge on 26/08/2018 - 15:33
If you could only have one Limited prime lens (inc. the 20-40).......
I really like the FA43 on film (I don't have a K-1), but it's too long for me on APS-C. I haven't used them, but I'm not a great fan of the concept of the DA Ltds - having manual film cameras means I need an aperture ring. I really like the dual purpose of the FA35/2 - a good focal length for film/F...
Posted by johnha on 30/08/2018 - 01:21
Hyperfocal Window on DA* Lenses
As soon as I typed that I realised! (Doh!) I downloaded the DOF App for PC and the iPhone (but can't seem to change the camera sensor type in App or make any other adjustments) so next challenge.
Posted by Snappyhoffy on 12/09/2018 - 23:14
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
Use a manual focus lens ? Surely not. OK, I am old and stupid, but : How does this beast autofocus at f1.4, given that the PDAF sensor Pentax use is effectively f2.8 ?
Posted by kh1234567890 on 21/09/2018 - 00:28
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
How does this beast autofocus at f1.4, given that the PDAF sensor Pentax use is effectively f2.8 ? Focuses just fine...... (warning, second picture is big) shots taken at 2.8 and 1.4 respectively.
Posted by pschlute on 21/09/2018 - 09:59
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
Use a manual focus lens ? Surely not. OK, I am old and stupid, but : How does this beast autofocus at f1.4, given that the PDAF sensor Pentax use is effectively f2.8 ? It's f/2.8 or faster so f/1.4 is OK. Pentax AF usually works above the specified aperture. i.e. the f/5.6 points still work at f...
Posted by Algernon on 21/09/2018 - 11:26
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
I don't believe the old lenses are performing any worse than they did in the past just because something new has come along! In one way that's true, but on the other hand digital sensors like telecentric lenses, and especially the old wide angles are definitely not telecentric. So they are worse on ...
Posted by Kim C on 11/10/2018 - 12:33
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
As to some of the older lenses, I think it is more our "perception" of them rather than them actually being worse on a digital sensor. True the big difference between a digital sensor and film is that film has a much wider angle of acceptance. This can be critical but in reality the most "affected" ...
Posted by johnha on 11/10/2018 - 14:22
