Search results for 'back focus' - page 1204
Minty old lenses
Don't thinks it's a macro lens (maybe close focus) but gets a reasonable write up at PF https://www.pentaxforums.com/userreviews/auto-super-paragon-pmc-28mm-f-2-8.html
Posted by JAK on 31/08/2018 - 20:09
Sigma 70-300 f4.0-5.6 DG Macro
I love the rendition and quality of the Pentax DFA*70-200 f2.8 but am finding it adds a considerable weight to my bag, and am rather regretting selling the Pentax 55-300mm although it is only APF-C. I am keenly awaiting the 70-200 f4.0 due next spring (say summer) but in the meantime I bought this ...
Posted by RobL on 11/09/2018 - 15:03
Hyperfocal Window on DA* Lenses
Well many of the old manual focus zooms did not have them either as the numbers change as you zoom the lens. As you can see your 16-50 does not have any DOF markings so you will have to do your own homework. This link may help http://www.dofmaster.com/dofjs.html
Posted by pschlute on 12/09/2018 - 17:35
Hyperfocal Window on DA* Lenses
Well many of the old manual focus zooms did not have them either as the numbers change as you zoom the lens. As you can see your 16-50 does not have any DOF markings so you will have to do your own homework. This link may help http://www.dofmaster.com/dofjs.html Thanks, I wonder what the point of...
Posted by Snappyhoffy on 12/09/2018 - 18:18
Hyperfocal Window on DA* Lenses
You can set the the camera to give you a DOF preview. Simpler than carrying a computer to work it out in the field. With automatic focus there really isn't the need for pre-setting the lens at the hyper-focal distance any more. If it's an old manual focus lens and it has the DOF scale on it the...
Posted by JAK on 12/09/2018 - 23:27
Hyperfocal Window on DA* Lenses
Or use my method...... i want everything in focus...use f16 i want the subject and most things around to be in focus ...use f5.6 i want only the subjects eyes in focus....use f1.4 Never failed me yet on either aps-c or FF
Posted by pschlute on 12/09/2018 - 23:32
Hyperfocal Window on DA* Lenses
A useful "rule of thumb" to maximise depth of field by using the hyperfocal distance is simply to set a small aperture such as f/16 and focus about one third of the way into the scene. It works and doesn't need lots of calculations.
Posted by johnriley on 13/09/2018 - 00:14
Hyperfocal Window on DA* Lenses
Thanks all, I must admit it has been an interesting 'learning curve' understanding the complexities of Focal Lengths and f Stops to consider those 'artistic' bokeh filled images rather than point and 'Auto Shoot'. A challenge for sure but something to develop a 'style' with all the variations of len...
Posted by Snappyhoffy on 13/09/2018 - 08:28
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
but why is the lens so much larger than the old F & FA 50mm f/1.4s? It has more than twice as many elements as the F or FA lenses. It has a focusing motor and the aperture controller inside. It is going to be bigger. Don't forget it is a "*" lens. Pentax get enough detractors moaning about t...
Posted by pschlute on 20/09/2018 - 17:21
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
At the end of the day. I think we may have to look at it as "What's the alternative" If you have purchased a top of the range Pentax camera. Put on an old film lens ? Last one was made over 30 years ago. From the video's I've seen this new lens knocks the spots off those. https://youtu.be/JTq2b...
Posted by stub on 20/09/2018 - 22:51
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
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
https://www.ephotozine.com/article/hd-pentax-d-fa-50mm-f-1-4-sdm-aw-lens-review--32731 Now all I have to do is suffer the anguish of it having to go back.........:lol:
Posted by johnriley on 24/09/2018 - 23:39
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
https://www.ephotozine.com/article/hd-pentax-d-fa-50mm-f-1-4-sdm-aw-lens-review--32731 Now all I have to do is suffer the anguish of it having to go back.........:lol: Have you not a spare body part you can sell John? It realy is a super lens. I agree that when mounted on the K1 it does not fee...
Posted by pschlute on 25/09/2018 - 01:47
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
https://www.ephotozine.com/article/hd-pentax-d-fa-50mm-f-1-4-sdm-aw-lens-review--32731 Now all I have to do is suffer the anguish of it having to go back.........:lol: I saw your post and read the review thinking you'd found a problem and had to return it :shock: I should take more note of th...
Posted by LennyBloke on 25/09/2018 - 09:14
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
Sorry to cause such anguish! No, it was great in every respect apart from the sad packaging up of lens and camera so that someone can come along and take it away again. Ah well.....the process of justifying buying one slowly begins! :twisted: Sorry John - should have mentioned - "Great Review" :...
Posted by LennyBloke on 25/09/2018 - 09:37
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
Clinical is certainly not a word I would use in reference to the D-FA*50/1.4 - Sharp, yes - the similarity to a surgeons scalpel is the only clinical comparison I could make but when used at wide apertures the clarity of the focus point is set beautifully against the beautifully smoothly rendered b...
Posted by LennyBloke on 10/10/2018 - 21:25
Pentax D-FA*50/1.4 introduced by Ricoh (UK) and SRS
Just to add I stuck with the ME/MX/K2 until the digital era as to me their successors seemed plasticky and inferior (starting with the A series.) At least that argument can't be levelled at the current crop of Pentax's which are indeed quite resilient and to be fair, less bulky than some of the com...
Posted by JAK on 11/10/2018 - 01:29
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
