dino21 Loc: McAllen, TX

I just received the Spyderlenscal today and am in the process of calibrating my lenses on my Nikon D7200.

Question: If I am calibrating a 50mm lens the instructions say to multiply the focal length by 25. In this case it would be 1250mm. However, my question is this... since there is a crop factor of 1.5 on a Nikon do I still calibrate for a 50mm lens or 1.5 times that which would be 75mm?

I know this is a dumb question but I want to make sure I do this correctly.

Also, I upon testing I find out it is back focusing, do I go to the plus side or minus side when calibrating in camera?

Thanks in advance for your help.

CO

I also have the SpyderLensCal. The 25 to 50 times the focal length guideline doesn't seem reasonable. You have to zoom in so much when you review it on a computer that the image becomes too pixelated. I use 5 to 10 times the focal length. I don't think you have to consider the crop factor of the camera.

If the camera is back focusing set in negative compensation.

Spiney Loc: Reading, PA

I’ll have to look at mine again. I don’t remember anything about multiplying the lens by anything. My D7000 had back focus issues and was fixed upon Calibration. I calibrated my 35, 50, and the kit zoom.

rgrenaderphoto Loc: Hollywood, CA

There's all kinds of video guides on YouTube.

dino21 Loc: McAllen, TX

Mr rgrenaderphoto, I have looked at about 6 of them and they do not address my questions....Thanks anyway, there are several here who have already helped. Alot of helpful people here thankfully.

ken_stern Loc: Yorba Linda, Ca

I also have & have used the Spyder-Lenscal --- Reviewing the Quick Start Guide --- Found nothing regarding - " instructions say to multiply the focal length by 25."

CO

Here is the page from their SpyderLensCal instruction manual. They used to have a formula to calculate the distance. It was very convoluted. It looks like they dropped that and now have the guidelines.

(Download)

dino21 Loc: McAllen, TX

thx!

dino21 Loc: McAllen, TX

thx

dino21 Loc: McAllen, TX

Many Many Thanks to all!!! I think I have it now!

RRS Loc: Not sure

Do yourself a favor and look up "Lens Align" and you can use the distance chart to determine the correct distance be it 25 or 50 times the focal length. The crop sensor does not come into play however if you connect an extender then you do have to factor that in. As already has been said, look up this question on You Tube and you will get all the info you will need and some more. I shoot Canon and it may be a play on words but if my camera is front focusing then I move the micro-adjustment to the plus side to move the focus up to the 0 point. I have been doing this for so long that I can usually just look at the view on the back of the camera and come very close with just one adjustment. If you have a back focus problem, focusing behind what you are focusing on then you would move the fine tune (Nikon) to the minus side to bring the focus back to the 0 line.