jeff_drew4 Posted January 3, 2016 Share Posted January 3, 2016 <p>Sanjay, I agree with Steve's summary of bellows vs tubes. Basically a bellows is a variable long tube. Greater magnifications are achieved easier with a bellows, but tubes are effective when traveling etc. I always seem to have one handy with my Hasselblad bag as I can get tighter portraits etc with the 250mm +1 short tube. Light compensation is minimal with the shorter tubes. The same is true with the helicoid. With P67ii, the meter will compensate for a tube. For the non-TL metering, one uses "math" or a defined table for compensation info. FYI, I have no experience with the telephotos past 300mm on P67 and cannot contribute much. If you are not sure about macro & want lowest cost startup, I would suggest trying an extension tube + normal lens combo and learn from there.</p> Link to comment Share on other sites More sharing options...
sanjay_chaudary Posted January 6, 2016 Author Share Posted January 6, 2016 <p>Hi, thanks for the response. I already have the auto extension set of 3 from pentax. Will the helicoid be of any use, taking this into consideration and is there any advantage?</p> Link to comment Share on other sites More sharing options...
steve_rasmussen Posted January 6, 2016 Share Posted January 6, 2016 <p>The helicoid tube keeps you from having to change tubes constantly. I use mine more than the regular tubes. However, I do use the two types at the same time on occasion. The helicoid combined with the 90-180 zoom gives you even more flexibility due to the zoom ability. </p> Link to comment Share on other sites More sharing options...
sanjay_chaudary Posted January 8, 2016 Author Share Posted January 8, 2016 <p>thanks a lot. I think I will stick to the existing auto extension tube set. happy new year guys</p> Link to comment Share on other sites More sharing options...
sanjay_chaudary Posted January 10, 2016 Author Share Posted January 10, 2016 <p>got my camera back from service . going to keep shooting pictures and get a feel of the body and the 45mm , 75mm shift . The 75mm shift seems trickier - never used shift lens earlier.<br> How do the 90-180 , 200mm and 165 LS compare optically with each other? I believe that the 90 -180 is quite good?<br> Planning to slowly get one of the above and practise with auto extension. It should help me decide on bellows and helicoid</p> Link to comment Share on other sites More sharing options...
steve_rasmussen Posted January 11, 2016 Share Posted January 11, 2016 <p>The 200 Pentax and 165LS are the same design type and both are sharp. The 90-180 is very similar in performance but if I had to say which is better, I would say the 200/165. But you would not be disappointed in any of the three. </p> Link to comment Share on other sites More sharing options...
sanjay_chaudary Posted January 12, 2016 Author Share Posted January 12, 2016 <p>thanks a ton</p> Link to comment Share on other sites More sharing options...
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