Search results for 'back focus' - page 1069
Excited with new Purchase
congratulations! but beware, when you start shooting limiteds, you are doomed. no way back... am I literally the only person who just doesn't get the whole limited lens thing ? Some of us are infected by the '*' thing as well... you will understand only when you have an FA*85:wink:
Posted by ilovesaabs on 13/12/2012 - 20:49
Question about the Pentax DFA 100mm macro
I was having a go with a friends DFA 100mm macro the other day and thinking I'd probably buy one. I'd be happy to have the non WR version same as his because I don't wish to pay the extra premium when I never shoot in the rain anyway! And the aperture ring would be useful for my purposes also. ...
Posted by Spaceman_Spiff on 13/12/2012 - 22:47
Question about the Pentax DFA 100mm macro
The clamp adds a little more friction to the focusing barrel to prevent lens creep when used vertically. It's probable that different copies of the same lens behave slightly differently. On mine, when the clamp is on, the focus ring can be turned, but the focusing barrel (the one with the scale o...
Posted by Mannesty on 14/12/2012 - 06:55
Question about the Pentax DFA 100mm macro
The clamp adds a little more friction to the focusing barrel to prevent lens creep when used vertically. It's probable that different copies of the same lens behave slightly differently. On mine, when the clamp is on, the focus ring can be turned, but the focusing barrel (the one with the scale o...
Posted by Spaceman_Spiff on 14/12/2012 - 13:18
Question about the Pentax DFA 100mm macro
I didn't realise it, but there is a Pentax-D FA instruction manual. This is what it says about the clamp: The clamp switch locks the manual focus position. You can use it when taking close-ups with a copy stand for example. Using the clamp switch:Focus manually, then set the clamp switch to on. ...
Posted by johnriley on 14/12/2012 - 14:52
Question about the Pentax DFA 100mm macro
Thanks John It sounds like the clamp is commonly damaged by people trying to manually turn the focus ring having forgotten they've engaged the lock. Wonder how much a repair costs, and whether this sort of damage breaks off anything inside the lens that might mess up the optics or focus travel. ...
Posted by Spaceman_Spiff on 14/12/2012 - 14:58
Question about the Pentax DFA 100mm macro
It sounds like the clamp is commonly damaged by people trying to manually turn the focus ring having forgotten they've engaged the lock. I think you may have over-imagined something here. There is no mention of, and very little likelihood of, the lens being damaged. The clamp is doing what it is...
Posted by Mannesty on 14/12/2012 - 15:36
Macro lenses- give me some subject ideas please
Loads you could shoot , in the garden try shooting decayed leaves, stems , cobwebs , close ups of fungus , you could even bring stuff inside if were having bad weather , good subjects to shoot indoors are old watches , try taking the back off one so you can shoot the mechanical workings , also draw...
Posted by Mal on 14/12/2012 - 10:59
Macro lenses- give me some subject ideas please
The true definition of macro starts at 1:1, although many earlier macro lenses will only focus to 1:2 without further aids. Modern zoom lenses that are abelled macro rarely go further than 1:4, still usefully close but not macro. At some point, I think 10:1 if I remember correctly, macro gives...
Posted by johnriley on 14/12/2012 - 15:43
DA* 300mm tripod mount
I got a long Arca-Swiss QR plate - 150mm - and attached it to the tripod foot. This acts as a great palm rest helping stability and I used it this way most of the summer. Even when using manual focus I can still rotate the focus ring with my fingers / thumb either side of the lens, and I have sma...
Posted by eenymac on 15/12/2012 - 23:11
DA* 300mm tripod mount
I keep toying with the idea of the BushHawk shoulder stock system for added stability, but always hold back due to the prospect of finding myself on the receiving end of an armed response unit! Always struck me as a very good system and can be fitted with a remote cord as well to use the trigger ...
Posted by eenymac on 17/12/2012 - 11:47
Pentax A*200/2.8
I wouldn't pay £300 unless he gets the repairs done or comes down to £200. It's a buyers market at present on long lenses. Sometimes the oil which is caused by the grease breaking down into soap and oil will evaporate. I've had Tamron lenses that have had the blades covered in oil and I've s...
Posted by Algernon on 19/12/2012 - 10:18
Wide angle
Brian I have no experience of the Sigma 8-16, but do own the 10-20 (older model). It's a great lens, as others on the forum will also testify. However when you specify you're thinking of "a wide lens", what uses do you have in mind? There is a huge difference between say 18 and 10mm; for exampl...
Posted by bychan on 19/12/2012 - 00:45
DA*16-85 still on roadmap
If it's not a constant 2.8, I won't want one. :) Same here. It may an unusually good copy but my Sigma 17-70 is great. but 2.8 -> 4.5 Ones I've tried seem soft in the corners. The Pentax 17-70 seems to have a long min. focus distance and the 16-50 seems to have a problem with SDM motors. Lets see if...
Posted by bforbes on 19/12/2012 - 23:19
DA*16-85 still on roadmap
When I tested af speed on my gx20 and k100d screw drive they where both the same speed travelling from one ene of the focus band to the other...
Posted by cabstar on 27/12/2012 - 21:13
DA*16-85 still on roadmap
When I tested af speed on my gx20 and k100d screw drive they where both the same speed travelling from one ene of the focus band to the other... Maybe they've designed the gearing ratios to cater for the torque of the SDM motor, and the screw drives uses the same ratios? My 50-135 focus speed is ...
Posted by Smeggypants on 27/12/2012 - 23:09
DA*16-85 still on roadmap
The 50-135 is a lot slower than my 16-50 but then the focus distance travel is a lot smaller on the 16-50. I will have to do a side by side comparison and video it.
Posted by cabstar on 28/12/2012 - 01:00
DA*16-85 still on roadmap
Both my DA* zooms (16-50 and 60-250) suffered the dreaded SDM failure and on return from JPS they felt better than new. Until then I always considered back up lenses - the 55-300 didn't stay long with me and the 17-70 I tried in Jessops was faulty...a properly functioning DA* lens is excellent!
Posted by ilovesaabs on 30/12/2012 - 22:03
Pentax SMC DA* 16-50mm f/2.8 Lens
Thanks Steve, good point. It is possible to buy really good second hand lenses, but the guarantee of a new lens is something I personally would prefer. It didn't matter as much with manual focus lenses, but as they have become more and more complex maybe it matters more now.
Posted by johnriley on 21/12/2012 - 10:09
Sigma 150-500
I have the Kenko 1.5x TC (with SDM /HSM contacts) which I have used a few times with my Sigma 50-500mm in good light and it works well. The in-lens OS really does a good job and allows good results handheld, as long as I don't go all the way to 500mm on the lens. Must stress though that good ligh...
Posted by eenymac on 30/12/2012 - 10:49
