Search results for 'back focus' - page 1552
AF Calibration on the K20D
By using the 50mm f1.2 may be the problem. Whilst I don't have that lens, I have encountered severe focus shift (back focus) on some Sigma fast primes (30 and 50mm). This phenomenon is also suffered by some Canon and Nikon lenses as well. For that reason, I check the focus adjustment of my fast len...
Posted by Smeggypants on 09/11/2010 - 22:40
AF Calibration on the K20D
Here is a test from Photozone. At the bottom of the analysis page, there is section on LoCa. The lens is in a fixed position and the apertures form f1.4 to f4 are shown. Mouse over 1.4 on up to 4 and you will see the effect. This lens back focuses as it is stopped down. If it was my lens, I would c...
Posted by bobrapp on 09/11/2010 - 23:59
AF Calibration on the K20D
Here is a test from Photozone. At the bottom of the analysis page, there is section on LoCa. The lens is in a fixed position and the apertures form f1.4 to f4 are shown. Mouse over 1.4 on up to 4 and you will see the effect. This lens back focuses as it is stopped down. If it was my lens, I would c...
Posted by Smeggypants on 10/11/2010 - 05:08
AF Calibration on the K20D
Yes, the LoCAs are caused by spherical aberrations which can induce focus shifts as a lens is stopped down. See: http://diglloyd.com/articles/Focus/FocusShift.html For setting the AF adjustments of my Pentax bodies, I use a Pentax-A 50mm f2.8 macro. Bob
Posted by bobrapp on 10/11/2010 - 14:48
AF Calibration on the K20D
Yes, the LoCAs are caused by spherical aberrations which can induce focus shifts as a lens is stopped down. See: http://diglloyd.com/articles/Focus/FocusShift.html interesting article For setting the AF adjustments of my Pentax bodies, I use a Pentax-A 50mm f2.8 macro. Bob I don't under...
Posted by Smeggypants on 10/11/2010 - 22:01
AF Calibration on the K20D
I don't understand. AF calibration changes or can change from lens to lens, or do you mean you set the internal debug mode AF setting with that lens and then offset the other lenses as required with the menu settings. It is one thing I don't understand. It was not a known issue with the Pentax AF f...
Posted by bobrapp on 13/11/2010 - 00:32
AF Calibration on the K20D
It is one thing I don't understand. It was not a known issue with the Pentax AF film cameras. How accurate AF is has always been an issue, but not one to which there was an electronic solution, so nobody talked about it. In any event, printing to 6"x4" we wouldn't notice anyway. Those who printed b...
Posted by johnriley on 13/11/2010 - 10:13
K5/7 and M lenses
Thank you Jon, looks like I missed the green button on the back (it's on the top on an *istD), and M lenses should remain usable, though I think I will check the trade in price to see if I can afford any upgrades. Most of the time my *ist D metered well enough via the green button but occasionall...
Posted by malcolmk on 10/10/2010 - 14:53
K5/7 and M lenses
I think you didn't look good enough for the green button :wink: Like you said it's on the back.
Posted by Anvh on 10/10/2010 - 22:39
My K5 Sample Shots from SRS Open Day
WARNING : IMAGE HEAVY! Please bear in mind, I'm not an expert in evaluating cameras, and I was only interested in how the ergonomics of the K5 felt to me, and how it responded with some of my lenses, with respect to focus speed and ability to lock. I used three of my favourite lenses : DA* 50-135...
Posted by flossie on 11/10/2010 - 11:09
Bike race camera/lens conundrum
Hi Guys, Each year we have the boxing day bike races in Wanganui. . It is the highlight of my year and photography has multiplied my enjoyment. I think I have hit a bit of a wall with my gear. K100D and 70-300 sigma APO :) My budget is very small so I wont be rushing off for a K-5 :) Pre...
Posted by Transit on 14/10/2010 - 02:46
Bike race camera/lens conundrum
I liked your Kayak photos on the Sigma Lens thread. If you see my subsequent posts, I bought the DAL 55-300 on Ebay. Someone in Taiwan is selling them ex Kit, no hood. http://cgi.ebay.com.au/NEW-PENTAX-DA-L-55-300mm-F4-5-8-F-4-5-8-ED-LENS-K-X-/360308232274?pt=AU_Cameras_Photographic_Accessories&h...
Posted by surfseen on 14/10/2010 - 03:59
Bike race camera/lens conundrum
http://cgi.ebay.com.au/NEW-PENTAX-DA-L-55-300mm-F4-5-8-F-4-5-8-ED-LENS-K-X-/360308232274?pt=AU_Cameras_Photographic_Accessories&hash=item53e40b5052 It cost me $NZ 406. Got it in a week. I think its great, better focus Good job surfseen. Btw; you have to watch these shrewd players and pounce on t...
Posted by user_removed on 14/10/2010 - 04:26
Bike race camera/lens conundrum
Thanks :) I think GST kicks in at $400 was your $406 inc nz end fees ? thanks for lens performance comments cheers Pete I liked your Kayak photos on the Sigma Lens thread. If you see my subsequent posts, I bought the DAL 55-300 on Ebay. Someone in Taiwan is selling them ex Kit, no hood. h...
Posted by Transit on 14/10/2010 - 10:45
Bike race camera/lens conundrum
.... Looking at the photo I think your timing requires a bit of practice.:D:D:D I have the same sigma and find it very good at f8-11.There's only you with knowledge of the circuit, it may be possible to get close enough to use a 50mm. John You mean the guys on the right left the field of focu...
Posted by Transit on 18/10/2010 - 09:08
K-7 Battery Grip Question
When I was using a grip I had it setup to use the grip battery first, when this was depleted it would revert to the body battery, I would then remove the grip battery for replacement with a spare (if you have 3 batteries) or recharge it. Once replaced it would automatically revert back to the grip. ...
Posted by Clarky on 15/10/2010 - 04:01
K-7 Battery Grip Question
When I was using a grip I had it setup to use the grip battery first, when this was depleted it would revert to the body battery, I would then remove the grip battery for replacement with a spare (if you have 3 batteries) or recharge it. Once replaced it would automatically revert back to the grip. ...
Posted by K10D on 15/10/2010 - 06:51
Pentax K-x far out performs the k20 at ISO 1600
I chose the K-x over the K7 because of its low light performance(being half the price helps as well). I have read reveiws that state the K7 performs slightly worse than the k20 at high ISO levels. Being an owner of a k20, I can state that the K-x far out performs the k20 at ISO 1600 ( check it on th...
Posted by gubak on 15/10/2010 - 10:44
K-5 in Canada.
I must admit I've been toying with the idea of selling both the K10&20D to fund a shiny new K5, now I've got my istD back from my son I would still have a back up body:D
Posted by fatspider on 16/10/2010 - 10:41
K-5 in Canada.
I will upgrade from my K10 if the K5 AF really is faster. I await the feedback from the soon to be new owners with interest. The AF off the K20D was already slightly faster and the AF of the K7 was also slightly faster then the K20D i believe so there must be quite a difference between the K10D and ...
Posted by Anvh on 16/10/2010 - 23:02
