QUOTE(albnok @ Oct 14 2009, 10:42 AM)
Poadster: The more the diopter rating of a closeup lens, the nearer the maximum focusing distance will be.
A +4 closeup, for example, makes a lens focused at infinity, focus at 1000mm/4 diopter or 250mm or 25cm close.
A +10 closeup, for example, makes a lens focused at infinity, focus at 1000mm/10 diopter or 100mm or 10cm close.
I don't know what the Raynox diopter ratings are.
Thus, a +10 will give better magnification since you can get closer to the subject... but you're limited in the sense that you cannot get further from the subject, either. I would suggest you use the 55-200mm focused at infinity since that will give you the most working distance to the subject.
Tnnx Albert... thats very detailed in explanation, will try to focus to infinity and try using the raynox again.
How do you set infinity in AF? Press the shutter button for 1 sec then release?
I suppose that i can also use the 1870 with the raynox.....
Added on October 14, 2009, 7:39 pmQUOTE(albnok @ Oct 14 2009, 11:53 AM)
SpOOkY: You get more apparent DOF due to lesser magnification of the background.
cjlai: Thanks! So it causes a maximum focus distance of 12.5cm.
Oooo... so the farthest away from the subject to the lens is 12.5cm (arnd 5 inches) to get good clear focus?
But hor... since the max of the zoom is 500mm, shldnt it be 500/8 = 62.5mm = 6.25cm? Just wanted to be clear....
Thnx...
Added on October 14, 2009, 8:08 pmWhat: TT for PJ people!
Featuring the Sony Cybershot WX-1 with Exmor-R backlit CMOS sensor (if you're interested in seeing how it performs). Hopefully we can get an A550 to make an appearance!
Also going to do backfocus testing for clivengu's Tamron 17-50mm F2.8 and A700 combo.
Where:
Lotus Five Star - State Cineplex PJ
Jalan Yong Shook Lin
Petaling Jaya, Selangor 46100, Malaysia
03-7960-7881
Link:
http://maps.google.com/maps?geocode=CRcpqv...755220509173299Parking should be easy there - it's next to a big parking lot. The mamak is one of the bigger, more spacious ones I've seen so far!
When: 8pm Thursday 15th October 2009
Who:
1) albnok
2) clivengu
3) eddyhan
4) tanjq87
5) kysham
6) shootkk (tentative)
7) Kul | Mo0 (tentative too)
8) Poadster (tentative, will try hard to make it as to learn from sifus... esp the raynox thingy)
9)
10)
This post has been edited by Poadster: Oct 14 2009, 08:08 PM 
Oct 14 2009, 02:35 PM
Quote
I think a bit high...unless d condition is really really excellent like new.. if not it should be round rm 1.2- 1k like tat 
hope can see the A550 too..
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