sudhakar.com

<p>Apologies. Not able to upload picture in earlier post.<br>

<img src="http://farm4.static.flickr.com/3580/3813897670_533e56ce8b.jpg" alt="" width="500" height="386" /></p>

<p>1st time post in POW.  Taken with SMC P 300mm/f4  on Pentax K100D super.    One of the most satisfying bird shot for me as I am getting used to this little ones in recent past.   Love the old primes.<br>

Pheasant-tailed jacana</p>

<p>Taken for recent Scott Kelby Photowalk. Hyderabad, India<br>

<img src="http://farm3.static.flickr.com/2538/3745280288_be87ae3566.jpg" alt="" width="333" height="500" /></p>

<p><img src="http://farm3.static.flickr.com/2659/3742232532_009b53a820.jpg" alt="" width="390" height="500" /></p>

<p>Sent flickr mail to Major Gill. <br>

-- One of those rare pentax user from India :-)</p>

<p>Finally the <strong>aluminium foil</strong> trick worked even after pentacon 135/2.8 showed no signs of auto focus. Any two contact points of the TC can be connected via the foil and it expects some pressure to operate.<br>

I also tried KA mount lens after foil in place and it worked normally.<br>

thanks for all inputs.</p>

<p>Thanks for the inputs friends. If 28mm is the issue let me try other m42 gear (macro takumar 50/4 and industar 50/4 also) before attempting on FOIL trick. Will experiment soon.<br>

Yes I agree teleconverters need to be used on tele lenses; the experiment is more on interaction of m42 lenses vs 1.7x TC.</p>

<p>Recently acquired Pentax AF 1.7x Teleconverter and tried on K mount 300/4 and KA mount 50/1.7 and I am fine. However when I tried against this 28/3.5 takumar, infinity focus is lost. Followed proper steps like attached the teleconverter, over it used Pentax original m42 adapter and then screwed in Super Takumar 28/3.5.<br /> <br /> I kind of understand, no contact points between lens and adapter? teleconverter (which is supposed to become autofocus) does not know actual lens information? not sure.<br /> <br /> Please through some light.<br>

thanks in advance</p>

<p>@Dave, thank you for clarification. Absoulte fantastic shots you showed as examples. I have a long way to achieve this<br>

@Andrew. Yes, pretty much agree on 1.5x APS-C crop factor does not make any sense. I use actual value only. Over the weekend first time I tried 300/f4 + 1.7 TC and by mistake I had set it 450 instead of 510. The results are not good and I am not sure this wrong setting might be one of the corruption factors other than shake from my hand. Will try more soon. BTW, since 300/f4 is K mount lens, EXIF data shows same values as what I set i.e. 450.<br>

thanks again.</p>

<p>Only once I used f/32 where my requirement is to minimize light as much as possible. Solar eclipse,through tinted glass, I ran out of 1/4000 speed which is fastest on my K100Dsuper. So I used f32/ + 1/4000 maxium limit of my camera.<br>

I need to try this on macro some time. Looks interesting.</p>

<p>Justin, Yep, I am an engineer (LOL at your guess); we enjoy breaking down and building up too. It is true that when we have too many choices and there should be some criteria to deicide and I gave my own weightage for my requirements. As Andrew mentioned, it varies from person to person. By the way, the criteria goes for a toss if I get a freebee any one of the lenses from above list. :-)<br>

I guess, brand do play role other wise I would have bought some kodak from walmart instead of Pentax. As far as 3rd party lenses, I do agree I am biased little bit but after going through reviews Tamron 17-50/2.8 still looks good for me.</p>

<p>John, since you are inclined towards extreme wide angle, your matrix might be different. But for my research, I came up my own. See if it helps in way. After this, I did enough research on Tamron 17-50/2.8 and that was also most probable one. However due to financial constraints, I did not go for new lens and went the other way, Super Takumar 28/3.5. The Old way :-)<br>

<img src="http://farm4.static.flickr.com/3491/3306275766_633990c8a3.jpg" alt="" width="500" height="303" /><br>

These are my notes at the time of matrix preparation<br>

<em>"Well, to make the story simple and effective, I am in the market for wide angle lens. Kind of alternative to kit lens (I do not have one now). Of course primes have advantage over zooms. There are numerous wide angles from different vendors; initial scanning resulted 5 short listed items.<br /> <br /> Obviously wide angle and fastness of the lens take precedence and I gave the factor 10 for these and next comes price and brand for which 5 is the factor; constant aperture and minimum focus distance is also considerable factor which is multiplied by 3 and weight is the least factor I wanted to consider for my kind of photography. There are various other factors that can be considered like sharpness(filtered already in shortlisting), Autofocus fastness, filter diameter (to consider my existing cokin filter P system) and many more."</em></p>

<p> </p>

<p>Greetings, I came across this soligor c/D lens on local ebay. Can some body identify weather it is a M42 screw mount? ( I want to use it on my pentax dSLR)<br>

http://cgi.ebay.in/Used-Soligor-C-D-Dualfocal-1-4-85mm-1-4-135mm-Lens_W0QQitemZ150328900436QQcmdZViewItemQQptZLH_DefaultDomain_203?hash=item150328900436&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318<br>

thanks in advance</p>